Get nested object values and put it on a table header












1














In the following stackblitz sample. I have the following data:



My table is displaying what I want, As you can see inside the timeline object the "start" values are exactly the same as the ones inside the aval array



Therefore, is there anyway I can display those table headers without the timeline object? (using filter, reduce or Array.from) Maybe I can loop to that very nested aval array and get them as an individual array kinda like



"aval" = ["11-19", "11-20", "11-21", "11-22"]


I'm using filter but getting nowhere so far.



DATA:



{

  "timeline": {

    "timeline_values": [{

        "tag": 0,

        "start": "11-19"

      },

      {

        "tag": 1,

        "start": "11-20"

      },

      {

        "tag": 2,

        "start": "11-21"

      },

      {

        "tag": 3,

        "start": "11-22"

      }

    ]

  },

  "employees": [{

      "EmployeeID": "56250f",

      "FirstName": "Downs",

      "aval": [{

          "start": "11-19",

          "end": "2",

          "ava": "30",

          "health": "4"

        },

        {

          "start": "11-20",

          "end": "2",

          "ava": "40",

          "health": "4"

        },

        {

          "start": "11-21",

          "end": "2",

          "ava": "50",

          "health": "4"

        },

        {

          "start": "11-22",

          "end": "2",

          "ava": "60",

          "health": "4"

        }

      ]

    },





javascript arrays angular reduce







share|improve this question






















  • Can you upload the full data and format it?
    – John Kennedy
    Nov 23 at 0:03










  • Is your question how to create an array called headers like ["11-19", "11-20", "11-21", "11-22"] from the employees.aval array in the data you posted?
    – slider
    Nov 23 at 0:08










  • data is inside the grid.component.ts the variable is called this.localObject , please open the stackblitz
    – brohymn
    Nov 23 at 0:10


















1














In the following stackblitz sample. I have the following data:



My table is displaying what I want, As you can see inside the timeline object the "start" values are exactly the same as the ones inside the aval array



Therefore, is there anyway I can display those table headers without the timeline object? (using filter, reduce or Array.from) Maybe I can loop to that very nested aval array and get them as an individual array kinda like



"aval" = ["11-19", "11-20", "11-21", "11-22"]


I'm using filter but getting nowhere so far.



DATA:



{

  "timeline": {

    "timeline_values": [{

        "tag": 0,

        "start": "11-19"

      },

      {

        "tag": 1,

        "start": "11-20"

      },

      {

        "tag": 2,

        "start": "11-21"

      },

      {

        "tag": 3,

        "start": "11-22"

      }

    ]

  },

  "employees": [{

      "EmployeeID": "56250f",

      "FirstName": "Downs",

      "aval": [{

          "start": "11-19",

          "end": "2",

          "ava": "30",

          "health": "4"

        },

        {

          "start": "11-20",

          "end": "2",

          "ava": "40",

          "health": "4"

        },

        {

          "start": "11-21",

          "end": "2",

          "ava": "50",

          "health": "4"

        },

        {

          "start": "11-22",

          "end": "2",

          "ava": "60",

          "health": "4"

        }

      ]

    },





javascript arrays angular reduce







share|improve this question






















  • Can you upload the full data and format it?
    – John Kennedy
    Nov 23 at 0:03










  • Is your question how to create an array called headers like ["11-19", "11-20", "11-21", "11-22"] from the employees.aval array in the data you posted?
    – slider
    Nov 23 at 0:08










  • data is inside the grid.component.ts the variable is called this.localObject , please open the stackblitz
    – brohymn
    Nov 23 at 0:10
















1












1








1


0





In the following stackblitz sample. I have the following data:



My table is displaying what I want, As you can see inside the timeline object the "start" values are exactly the same as the ones inside the aval array



Therefore, is there anyway I can display those table headers without the timeline object? (using filter, reduce or Array.from) Maybe I can loop to that very nested aval array and get them as an individual array kinda like



"aval" = ["11-19", "11-20", "11-21", "11-22"]


I'm using filter but getting nowhere so far.



DATA:



{

  "timeline": {

    "timeline_values": [{

        "tag": 0,

        "start": "11-19"

      },

      {

        "tag": 1,

        "start": "11-20"

      },

      {

        "tag": 2,

        "start": "11-21"

      },

      {

        "tag": 3,

        "start": "11-22"

      }

    ]

  },

  "employees": [{

      "EmployeeID": "56250f",

      "FirstName": "Downs",

      "aval": [{

          "start": "11-19",

          "end": "2",

          "ava": "30",

          "health": "4"

        },

        {

          "start": "11-20",

          "end": "2",

          "ava": "40",

          "health": "4"

        },

        {

          "start": "11-21",

          "end": "2",

          "ava": "50",

          "health": "4"

        },

        {

          "start": "11-22",

          "end": "2",

          "ava": "60",

          "health": "4"

        }

      ]

    },





javascript arrays angular reduce







share|improve this question













In the following stackblitz sample. I have the following data:



My table is displaying what I want, As you can see inside the timeline object the "start" values are exactly the same as the ones inside the aval array



Therefore, is there anyway I can display those table headers without the timeline object? (using filter, reduce or Array.from) Maybe I can loop to that very nested aval array and get them as an individual array kinda like



"aval" = ["11-19", "11-20", "11-21", "11-22"]


I'm using filter but getting nowhere so far.



DATA:



{

  "timeline": {

    "timeline_values": [{

        "tag": 0,

        "start": "11-19"

      },

      {

        "tag": 1,

        "start": "11-20"

      },

      {

        "tag": 2,

        "start": "11-21"

      },

      {

        "tag": 3,

        "start": "11-22"

      }

    ]

  },

  "employees": [{

      "EmployeeID": "56250f",

      "FirstName": "Downs",

      "aval": [{

          "start": "11-19",

          "end": "2",

          "ava": "30",

          "health": "4"

        },

        {

          "start": "11-20",

          "end": "2",

          "ava": "40",

          "health": "4"

        },

        {

          "start": "11-21",

          "end": "2",

          "ava": "50",

          "health": "4"

        },

        {

          "start": "11-22",

          "end": "2",

          "ava": "60",

          "health": "4"

        }

      ]

    },





javascript arrays angular reduce




javascript arrays angular reduce






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Nov 22 at 23:56









brohymn

157113




157113












  • Can you upload the full data and format it?
    – John Kennedy
    Nov 23 at 0:03










  • Is your question how to create an array called headers like ["11-19", "11-20", "11-21", "11-22"] from the employees.aval array in the data you posted?
    – slider
    Nov 23 at 0:08










  • data is inside the grid.component.ts the variable is called this.localObject , please open the stackblitz
    – brohymn
    Nov 23 at 0:10




















  • Can you upload the full data and format it?
    – John Kennedy
    Nov 23 at 0:03










  • Is your question how to create an array called headers like ["11-19", "11-20", "11-21", "11-22"] from the employees.aval array in the data you posted?
    – slider
    Nov 23 at 0:08










  • data is inside the grid.component.ts the variable is called this.localObject , please open the stackblitz
    – brohymn
    Nov 23 at 0:10


















Can you upload the full data and format it?
– John Kennedy
Nov 23 at 0:03




Can you upload the full data and format it?
– John Kennedy
Nov 23 at 0:03












Is your question how to create an array called headers like ["11-19", "11-20", "11-21", "11-22"] from the employees.aval array in the data you posted?
– slider
Nov 23 at 0:08




Is your question how to create an array called headers like ["11-19", "11-20", "11-21", "11-22"] from the employees.aval array in the data you posted?
– slider
Nov 23 at 0:08












data is inside the grid.component.ts the variable is called this.localObject , please open the stackblitz
– brohymn
Nov 23 at 0:10






data is inside the grid.component.ts the variable is called this.localObject , please open the stackblitz
– brohymn
Nov 23 at 0:10














2 Answers
2






active

oldest

votes


















2














Assuming you wanted the aval list from employee list, you can try a combination of map and reduce




  • Map to create arrays of array which will have all start aval values for a particular employee employee -> aval -> start


  • Reduce to flatten the array of arrays


  • Finally use ES6 Set to pick unique values.






const employees = [{

    "EmployeeID": "56250f",

    "FirstName": "Downs",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "30",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "40",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "50",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "60",

        "health": "4"

      }

    ]

  },

  {

    "EmployeeID": "56250f",

    "FirstName": "Mckenzie",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "1",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "2",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "3",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "4",

        "health": "4"

      }

    ]

  }, {

    "EmployeeID": "56250f",

    "FirstName": "Charles",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "100",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "200",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "300",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "400",

        "health": "4"

      }

    ]

  }

]



const mappedAvals = employees.map(emp => emp.aval.map(av => av.start));

console.log("************* MAPPED AVALS **************");

console.log(mappedAvals);

console.log("************* MAPPED AVALS **************");



const flattenedAvals = mappedAvals.reduce((acc, aval) => [...acc, ...aval], );



console.log("************* FLATTENED AVALS **************");

console.log(flattenedAvals);

console.log("************* FLATTENED AVALS **************");



const distinctAvals = [...(new Set(flattenedAvals))];



console.log("************* DISTINCT AVALS **************");

console.log(distinctAvals);

console.log("************* DISTINCT AVALS **************");








share|improve this answer























  • Thanks. Reduce is not my forte. may I ask a good source of learning ?
    – brohymn
    Nov 23 at 0:23










  • Trying out multiple examples like adding a list of numbers, counting the occurrences of characters, merging lists etc will definitely get you started but sorry, I am not aware of any particular good sources. The way you use the accumulator argument is the key to reduce method IMHO.
    – Nandu Kalidindi
    Nov 23 at 0:27



















0














You can also use flatMap (if it's supported) and a Set:



const aval = [...new Set(employees.flatMap(e => e.aval.map(a => a.start)))];







const employees = [{

    "EmployeeID": "56250f",

    "FirstName": "Downs",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "30",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "40",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "50",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "60",

        "health": "4"

      }

    ]

  },

  {

    "EmployeeID": "56250f",

    "FirstName": "Mckenzie",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "1",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "2",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "3",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "4",

        "health": "4"

      }

    ]

  }, {

    "EmployeeID": "56250f",

    "FirstName": "Charles",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "100",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "200",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "300",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "400",

        "health": "4"

      }

    ]

  }

]



const aval = [...new Set(employees.flatMap(e => e.aval.map(a => a.start)))];

console.log(aval);








share|improve this answer

















  • 1




    This solution is much cleaner and it works , however there is a couple of things to consider. First, in Angular/ typescript, I have to change the data type of employees from any to any, which sometimes cannot be ideal. Also according to mdn IE and EDGE don't support it. they provide an alternative with reduce and concat tho.
    – brohymn
    Nov 23 at 15:41












  • @brohymn as for your second point about IE and Edge, the Typescript you write in your angular app is transpiled to Javascript that should work in all browsers: angular.io/guide/typescript-configuration
    – slider
    Nov 23 at 15:53











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2 Answers
2






active

oldest

votes








2 Answers
2






active

oldest

votes









active

oldest

votes






active

oldest

votes









2














Assuming you wanted the aval list from employee list, you can try a combination of map and reduce




  • Map to create arrays of array which will have all start aval values for a particular employee employee -> aval -> start


  • Reduce to flatten the array of arrays


  • Finally use ES6 Set to pick unique values.






const employees = [{

    "EmployeeID": "56250f",

    "FirstName": "Downs",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "30",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "40",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "50",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "60",

        "health": "4"

      }

    ]

  },

  {

    "EmployeeID": "56250f",

    "FirstName": "Mckenzie",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "1",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "2",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "3",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "4",

        "health": "4"

      }

    ]

  }, {

    "EmployeeID": "56250f",

    "FirstName": "Charles",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "100",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "200",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "300",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "400",

        "health": "4"

      }

    ]

  }

]



const mappedAvals = employees.map(emp => emp.aval.map(av => av.start));

console.log("************* MAPPED AVALS **************");

console.log(mappedAvals);

console.log("************* MAPPED AVALS **************");



const flattenedAvals = mappedAvals.reduce((acc, aval) => [...acc, ...aval], );



console.log("************* FLATTENED AVALS **************");

console.log(flattenedAvals);

console.log("************* FLATTENED AVALS **************");



const distinctAvals = [...(new Set(flattenedAvals))];



console.log("************* DISTINCT AVALS **************");

console.log(distinctAvals);

console.log("************* DISTINCT AVALS **************");








share|improve this answer























  • Thanks. Reduce is not my forte. may I ask a good source of learning ?
    – brohymn
    Nov 23 at 0:23










  • Trying out multiple examples like adding a list of numbers, counting the occurrences of characters, merging lists etc will definitely get you started but sorry, I am not aware of any particular good sources. The way you use the accumulator argument is the key to reduce method IMHO.
    – Nandu Kalidindi
    Nov 23 at 0:27
















2














Assuming you wanted the aval list from employee list, you can try a combination of map and reduce




  • Map to create arrays of array which will have all start aval values for a particular employee employee -> aval -> start


  • Reduce to flatten the array of arrays


  • Finally use ES6 Set to pick unique values.






const employees = [{

    "EmployeeID": "56250f",

    "FirstName": "Downs",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "30",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "40",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "50",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "60",

        "health": "4"

      }

    ]

  },

  {

    "EmployeeID": "56250f",

    "FirstName": "Mckenzie",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "1",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "2",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "3",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "4",

        "health": "4"

      }

    ]

  }, {

    "EmployeeID": "56250f",

    "FirstName": "Charles",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "100",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "200",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "300",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "400",

        "health": "4"

      }

    ]

  }

]



const mappedAvals = employees.map(emp => emp.aval.map(av => av.start));

console.log("************* MAPPED AVALS **************");

console.log(mappedAvals);

console.log("************* MAPPED AVALS **************");



const flattenedAvals = mappedAvals.reduce((acc, aval) => [...acc, ...aval], );



console.log("************* FLATTENED AVALS **************");

console.log(flattenedAvals);

console.log("************* FLATTENED AVALS **************");



const distinctAvals = [...(new Set(flattenedAvals))];



console.log("************* DISTINCT AVALS **************");

console.log(distinctAvals);

console.log("************* DISTINCT AVALS **************");








share|improve this answer























  • Thanks. Reduce is not my forte. may I ask a good source of learning ?
    – brohymn
    Nov 23 at 0:23










  • Trying out multiple examples like adding a list of numbers, counting the occurrences of characters, merging lists etc will definitely get you started but sorry, I am not aware of any particular good sources. The way you use the accumulator argument is the key to reduce method IMHO.
    – Nandu Kalidindi
    Nov 23 at 0:27














2












2








2






Assuming you wanted the aval list from employee list, you can try a combination of map and reduce




  • Map to create arrays of array which will have all start aval values for a particular employee employee -> aval -> start


  • Reduce to flatten the array of arrays


  • Finally use ES6 Set to pick unique values.






const employees = [{

    "EmployeeID": "56250f",

    "FirstName": "Downs",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "30",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "40",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "50",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "60",

        "health": "4"

      }

    ]

  },

  {

    "EmployeeID": "56250f",

    "FirstName": "Mckenzie",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "1",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "2",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "3",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "4",

        "health": "4"

      }

    ]

  }, {

    "EmployeeID": "56250f",

    "FirstName": "Charles",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "100",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "200",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "300",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "400",

        "health": "4"

      }

    ]

  }

]



const mappedAvals = employees.map(emp => emp.aval.map(av => av.start));

console.log("************* MAPPED AVALS **************");

console.log(mappedAvals);

console.log("************* MAPPED AVALS **************");



const flattenedAvals = mappedAvals.reduce((acc, aval) => [...acc, ...aval], );



console.log("************* FLATTENED AVALS **************");

console.log(flattenedAvals);

console.log("************* FLATTENED AVALS **************");



const distinctAvals = [...(new Set(flattenedAvals))];



console.log("************* DISTINCT AVALS **************");

console.log(distinctAvals);

console.log("************* DISTINCT AVALS **************");








share|improve this answer














Assuming you wanted the aval list from employee list, you can try a combination of map and reduce




  • Map to create arrays of array which will have all start aval values for a particular employee employee -> aval -> start


  • Reduce to flatten the array of arrays


  • Finally use ES6 Set to pick unique values.






const employees = [{

    "EmployeeID": "56250f",

    "FirstName": "Downs",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "30",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "40",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "50",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "60",

        "health": "4"

      }

    ]

  },

  {

    "EmployeeID": "56250f",

    "FirstName": "Mckenzie",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "1",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "2",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "3",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "4",

        "health": "4"

      }

    ]

  }, {

    "EmployeeID": "56250f",

    "FirstName": "Charles",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "100",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "200",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "300",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "400",

        "health": "4"

      }

    ]

  }

]



const mappedAvals = employees.map(emp => emp.aval.map(av => av.start));

console.log("************* MAPPED AVALS **************");

console.log(mappedAvals);

console.log("************* MAPPED AVALS **************");



const flattenedAvals = mappedAvals.reduce((acc, aval) => [...acc, ...aval], );



console.log("************* FLATTENED AVALS **************");

console.log(flattenedAvals);

console.log("************* FLATTENED AVALS **************");



const distinctAvals = [...(new Set(flattenedAvals))];



console.log("************* DISTINCT AVALS **************");

console.log(distinctAvals);

console.log("************* DISTINCT AVALS **************");








const employees = [{

    "EmployeeID": "56250f",

    "FirstName": "Downs",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "30",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "40",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "50",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "60",

        "health": "4"

      }

    ]

  },

  {

    "EmployeeID": "56250f",

    "FirstName": "Mckenzie",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "1",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "2",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "3",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "4",

        "health": "4"

      }

    ]

  }, {

    "EmployeeID": "56250f",

    "FirstName": "Charles",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "100",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "200",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "300",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "400",

        "health": "4"

      }

    ]

  }

]



const mappedAvals = employees.map(emp => emp.aval.map(av => av.start));

console.log("************* MAPPED AVALS **************");

console.log(mappedAvals);

console.log("************* MAPPED AVALS **************");



const flattenedAvals = mappedAvals.reduce((acc, aval) => [...acc, ...aval], );



console.log("************* FLATTENED AVALS **************");

console.log(flattenedAvals);

console.log("************* FLATTENED AVALS **************");



const distinctAvals = [...(new Set(flattenedAvals))];



console.log("************* DISTINCT AVALS **************");

console.log(distinctAvals);

console.log("************* DISTINCT AVALS **************");





const employees = [{

    "EmployeeID": "56250f",

    "FirstName": "Downs",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "30",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "40",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "50",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "60",

        "health": "4"

      }

    ]

  },

  {

    "EmployeeID": "56250f",

    "FirstName": "Mckenzie",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "1",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "2",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "3",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "4",

        "health": "4"

      }

    ]

  }, {

    "EmployeeID": "56250f",

    "FirstName": "Charles",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "100",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "200",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "300",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "400",

        "health": "4"

      }

    ]

  }

]



const mappedAvals = employees.map(emp => emp.aval.map(av => av.start));

console.log("************* MAPPED AVALS **************");

console.log(mappedAvals);

console.log("************* MAPPED AVALS **************");



const flattenedAvals = mappedAvals.reduce((acc, aval) => [...acc, ...aval], );



console.log("************* FLATTENED AVALS **************");

console.log(flattenedAvals);

console.log("************* FLATTENED AVALS **************");



const distinctAvals = [...(new Set(flattenedAvals))];



console.log("************* DISTINCT AVALS **************");

console.log(distinctAvals);

console.log("************* DISTINCT AVALS **************");






share|improve this answer














share|improve this answer



share|improve this answer








edited Nov 23 at 0:17

























answered Nov 23 at 0:09









Nandu Kalidindi

3,7401921




3,7401921












  • Thanks. Reduce is not my forte. may I ask a good source of learning ?
    – brohymn
    Nov 23 at 0:23










  • Trying out multiple examples like adding a list of numbers, counting the occurrences of characters, merging lists etc will definitely get you started but sorry, I am not aware of any particular good sources. The way you use the accumulator argument is the key to reduce method IMHO.
    – Nandu Kalidindi
    Nov 23 at 0:27


















  • Thanks. Reduce is not my forte. may I ask a good source of learning ?
    – brohymn
    Nov 23 at 0:23










  • Trying out multiple examples like adding a list of numbers, counting the occurrences of characters, merging lists etc will definitely get you started but sorry, I am not aware of any particular good sources. The way you use the accumulator argument is the key to reduce method IMHO.
    – Nandu Kalidindi
    Nov 23 at 0:27
















Thanks. Reduce is not my forte. may I ask a good source of learning ?
– brohymn
Nov 23 at 0:23




Thanks. Reduce is not my forte. may I ask a good source of learning ?
– brohymn
Nov 23 at 0:23












Trying out multiple examples like adding a list of numbers, counting the occurrences of characters, merging lists etc will definitely get you started but sorry, I am not aware of any particular good sources. The way you use the accumulator argument is the key to reduce method IMHO.
– Nandu Kalidindi
Nov 23 at 0:27




Trying out multiple examples like adding a list of numbers, counting the occurrences of characters, merging lists etc will definitely get you started but sorry, I am not aware of any particular good sources. The way you use the accumulator argument is the key to reduce method IMHO.
– Nandu Kalidindi
Nov 23 at 0:27













0














You can also use flatMap (if it's supported) and a Set:



const aval = [...new Set(employees.flatMap(e => e.aval.map(a => a.start)))];







const employees = [{

    "EmployeeID": "56250f",

    "FirstName": "Downs",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "30",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "40",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "50",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "60",

        "health": "4"

      }

    ]

  },

  {

    "EmployeeID": "56250f",

    "FirstName": "Mckenzie",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "1",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "2",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "3",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "4",

        "health": "4"

      }

    ]

  }, {

    "EmployeeID": "56250f",

    "FirstName": "Charles",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "100",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "200",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "300",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "400",

        "health": "4"

      }

    ]

  }

]



const aval = [...new Set(employees.flatMap(e => e.aval.map(a => a.start)))];

console.log(aval);








share|improve this answer

















  • 1




    This solution is much cleaner and it works , however there is a couple of things to consider. First, in Angular/ typescript, I have to change the data type of employees from any to any, which sometimes cannot be ideal. Also according to mdn IE and EDGE don't support it. they provide an alternative with reduce and concat tho.
    – brohymn
    Nov 23 at 15:41












  • @brohymn as for your second point about IE and Edge, the Typescript you write in your angular app is transpiled to Javascript that should work in all browsers: angular.io/guide/typescript-configuration
    – slider
    Nov 23 at 15:53
















0














You can also use flatMap (if it's supported) and a Set:



const aval = [...new Set(employees.flatMap(e => e.aval.map(a => a.start)))];







const employees = [{

    "EmployeeID": "56250f",

    "FirstName": "Downs",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "30",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "40",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "50",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "60",

        "health": "4"

      }

    ]

  },

  {

    "EmployeeID": "56250f",

    "FirstName": "Mckenzie",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "1",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "2",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "3",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "4",

        "health": "4"

      }

    ]

  }, {

    "EmployeeID": "56250f",

    "FirstName": "Charles",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "100",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "200",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "300",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "400",

        "health": "4"

      }

    ]

  }

]



const aval = [...new Set(employees.flatMap(e => e.aval.map(a => a.start)))];

console.log(aval);








share|improve this answer

















  • 1




    This solution is much cleaner and it works , however there is a couple of things to consider. First, in Angular/ typescript, I have to change the data type of employees from any to any, which sometimes cannot be ideal. Also according to mdn IE and EDGE don't support it. they provide an alternative with reduce and concat tho.
    – brohymn
    Nov 23 at 15:41












  • @brohymn as for your second point about IE and Edge, the Typescript you write in your angular app is transpiled to Javascript that should work in all browsers: angular.io/guide/typescript-configuration
    – slider
    Nov 23 at 15:53














0












0








0






You can also use flatMap (if it's supported) and a Set:



const aval = [...new Set(employees.flatMap(e => e.aval.map(a => a.start)))];







const employees = [{

    "EmployeeID": "56250f",

    "FirstName": "Downs",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "30",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "40",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "50",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "60",

        "health": "4"

      }

    ]

  },

  {

    "EmployeeID": "56250f",

    "FirstName": "Mckenzie",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "1",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "2",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "3",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "4",

        "health": "4"

      }

    ]

  }, {

    "EmployeeID": "56250f",

    "FirstName": "Charles",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "100",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "200",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "300",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "400",

        "health": "4"

      }

    ]

  }

]



const aval = [...new Set(employees.flatMap(e => e.aval.map(a => a.start)))];

console.log(aval);








share|improve this answer












You can also use flatMap (if it's supported) and a Set:



const aval = [...new Set(employees.flatMap(e => e.aval.map(a => a.start)))];







const employees = [{

    "EmployeeID": "56250f",

    "FirstName": "Downs",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "30",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "40",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "50",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "60",

        "health": "4"

      }

    ]

  },

  {

    "EmployeeID": "56250f",

    "FirstName": "Mckenzie",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "1",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "2",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "3",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "4",

        "health": "4"

      }

    ]

  }, {

    "EmployeeID": "56250f",

    "FirstName": "Charles",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "100",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "200",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "300",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "400",

        "health": "4"

      }

    ]

  }

]



const aval = [...new Set(employees.flatMap(e => e.aval.map(a => a.start)))];

console.log(aval);








const employees = [{

    "EmployeeID": "56250f",

    "FirstName": "Downs",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "30",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "40",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "50",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "60",

        "health": "4"

      }

    ]

  },

  {

    "EmployeeID": "56250f",

    "FirstName": "Mckenzie",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "1",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "2",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "3",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "4",

        "health": "4"

      }

    ]

  }, {

    "EmployeeID": "56250f",

    "FirstName": "Charles",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "100",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "200",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "300",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "400",

        "health": "4"

      }

    ]

  }

]



const aval = [...new Set(employees.flatMap(e => e.aval.map(a => a.start)))];

console.log(aval);





const employees = [{

    "EmployeeID": "56250f",

    "FirstName": "Downs",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "30",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "40",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "50",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "60",

        "health": "4"

      }

    ]

  },

  {

    "EmployeeID": "56250f",

    "FirstName": "Mckenzie",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "1",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "2",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "3",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "4",

        "health": "4"

      }

    ]

  }, {

    "EmployeeID": "56250f",

    "FirstName": "Charles",

    "aval": [{

        "start": "11-19",

        "end": "2",

        "ava": "100",

        "health": "4"

      },

      {

        "start": "11-20",

        "end": "2",

        "ava": "200",

        "health": "4"

      },

      {

        "start": "11-21",

        "end": "2",

        "ava": "300",

        "health": "4"

      },

      {

        "start": "11-22",

        "end": "2",

        "ava": "400",

        "health": "4"

      }

    ]

  }

]



const aval = [...new Set(employees.flatMap(e => e.aval.map(a => a.start)))];

console.log(aval);






share|improve this answer












share|improve this answer



share|improve this answer










answered Nov 23 at 0:33









slider

8,0251129




8,0251129








  • 1




    This solution is much cleaner and it works , however there is a couple of things to consider. First, in Angular/ typescript, I have to change the data type of employees from any to any, which sometimes cannot be ideal. Also according to mdn IE and EDGE don't support it. they provide an alternative with reduce and concat tho.
    – brohymn
    Nov 23 at 15:41












  • @brohymn as for your second point about IE and Edge, the Typescript you write in your angular app is transpiled to Javascript that should work in all browsers: angular.io/guide/typescript-configuration
    – slider
    Nov 23 at 15:53














  • 1




    This solution is much cleaner and it works , however there is a couple of things to consider. First, in Angular/ typescript, I have to change the data type of employees from any to any, which sometimes cannot be ideal. Also according to mdn IE and EDGE don't support it. they provide an alternative with reduce and concat tho.
    – brohymn
    Nov 23 at 15:41












  • @brohymn as for your second point about IE and Edge, the Typescript you write in your angular app is transpiled to Javascript that should work in all browsers: angular.io/guide/typescript-configuration
    – slider
    Nov 23 at 15:53








1




1




This solution is much cleaner and it works , however there is a couple of things to consider. First, in Angular/ typescript, I have to change the data type of employees from any to any, which sometimes cannot be ideal. Also according to mdn IE and EDGE don't support it. they provide an alternative with reduce and concat tho.
– brohymn
Nov 23 at 15:41






This solution is much cleaner and it works , however there is a couple of things to consider. First, in Angular/ typescript, I have to change the data type of employees from any to any, which sometimes cannot be ideal. Also according to mdn IE and EDGE don't support it. they provide an alternative with reduce and concat tho.
– brohymn
Nov 23 at 15:41














@brohymn as for your second point about IE and Edge, the Typescript you write in your angular app is transpiled to Javascript that should work in all browsers: angular.io/guide/typescript-configuration
– slider
Nov 23 at 15:53




@brohymn as for your second point about IE and Edge, the Typescript you write in your angular app is transpiled to Javascript that should work in all browsers: angular.io/guide/typescript-configuration
– slider
Nov 23 at 15:53


















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