How to sort an array using values from an enum?
2
I want to sort elements of an array using an enum, I would like to know how to do it, I have tried with a switch statement with no success.
const enum Order {
Start = 'Start',
Run = 'Run',
End = 'End',
}
const predicate (a, b) => // TODO
const data = [Order.End, Order.Run, Order.Start]
const result = data.sort(predicate)
// wanted result is: // Start, Run, End
javascript typescript
asked Nov 26 '18 at 9:52
RadexRadex
93321029
add a comment |
2
I want to sort elements of an array using an enum, I would like to know how to do it, I have tried with a switch statement with no success.
const enum Order {
Start = 'Start',
Run = 'Run',
End = 'End',
}
const predicate (a, b) => // TODO
const data = [Order.End, Order.Run, Order.Start]
const result = data.sort(predicate)
// wanted result is: // Start, Run, End
javascript typescript
asked Nov 26 '18 at 9:52
RadexRadex
93321029
add a comment |
2
2
2
1
I want to sort elements of an array using an enum, I would like to know how to do it, I have tried with a switch statement with no success.
const enum Order {
Start = 'Start',
Run = 'Run',
End = 'End',
}
const predicate (a, b) => // TODO
const data = [Order.End, Order.Run, Order.Start]
const result = data.sort(predicate)
// wanted result is: // Start, Run, End
javascript typescript
asked Nov 26 '18 at 9:52
RadexRadex
93321029
I want to sort elements of an array using an enum, I would like to know how to do it, I have tried with a switch statement with no success.
const enum Order {
Start = 'Start',
Run = 'Run',
End = 'End',
}
const predicate (a, b) => // TODO
const data = [Order.End, Order.Run, Order.Start]
const result = data.sort(predicate)
// wanted result is: // Start, Run, End
javascript typescript
javascript typescript
asked Nov 26 '18 at 9:52
RadexRadex
93321029
asked Nov 26 '18 at 9:52
RadexRadex
93321029
asked Nov 26 '18 at 9:52
RadexRadex
93321029
asked Nov 26 '18 at 9:52
RadexRadex
93321029
asked Nov 26 '18 at 9:52
RadexRadex
93321029
93321029
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
4
Normally with an enum, the value is already comparable.
const enum Order {
Start = 0,
Run = 1,
End = 2,
}
const data = [Order.End, Order.Run, Order.Start];
const result = data.sort();
console.log(result);
A non-constant enum can even be mapped to the string values, as shown here:
enum Order {
Start = 0,
Run = 1,
End = 2,
}
const data = [Order.End, Order.Run, Order.Start];
const result = data.sort();
console.log(result.map((val) => Order[val]));
But in your case, you could convert them into an easily sortable value if necessary (assuming you desire to avoid alphabetical ordering).
const enum Order {
Start = 'Start',
Run = 'Run',
End = 'End',
}
const predicate = (a, b) => {
const map = {};
map[Order.Start] = 1;
map[Order.Run] = 2;
map[Order.End] = 3;
if (map[a] < map[b]) {
return -1;
}
if (map[a] > map[b]) {
return 1;
}
return 0;
}
const data = [Order.End, Order.Run, Order.Start];
const result = data.sort(predicate);
console.log(result);
answered Nov 26 '18 at 10:00
FentonFenton
154k42290313
Thanks for your answer! is it possible to get the ordinal number directly from typescript wit out using the map?
– Radex
Nov 26 '18 at 10:03
1
If you use a non-const enum with numeric values you can access the string names and the value. So the second example wherevalis the value andOrder[val]is the name. When using aconst enumevery use gets replaced with a literal value, so there isn't anywhere to store another value except in a separate map.
– Fenton
Nov 26 '18 at 10:09
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
4
Normally with an enum, the value is already comparable.
const enum Order {
Start = 0,
Run = 1,
End = 2,
}
const data = [Order.End, Order.Run, Order.Start];
const result = data.sort();
console.log(result);
A non-constant enum can even be mapped to the string values, as shown here:
enum Order {
Start = 0,
Run = 1,
End = 2,
}
const data = [Order.End, Order.Run, Order.Start];
const result = data.sort();
console.log(result.map((val) => Order[val]));
But in your case, you could convert them into an easily sortable value if necessary (assuming you desire to avoid alphabetical ordering).
const enum Order {
Start = 'Start',
Run = 'Run',
End = 'End',
}
const predicate = (a, b) => {
const map = {};
map[Order.Start] = 1;
map[Order.Run] = 2;
map[Order.End] = 3;
if (map[a] < map[b]) {
return -1;
}
if (map[a] > map[b]) {
return 1;
}
return 0;
}
const data = [Order.End, Order.Run, Order.Start];
const result = data.sort(predicate);
console.log(result);
answered Nov 26 '18 at 10:00
FentonFenton
154k42290313
Thanks for your answer! is it possible to get the ordinal number directly from typescript wit out using the map?
– Radex
Nov 26 '18 at 10:03
1
If you use a non-const enum with numeric values you can access the string names and the value. So the second example wherevalis the value andOrder[val]is the name. When using aconst enumevery use gets replaced with a literal value, so there isn't anywhere to store another value except in a separate map.
– Fenton
Nov 26 '18 at 10:09
add a comment |
4
Normally with an enum, the value is already comparable.
const enum Order {
Start = 0,
Run = 1,
End = 2,
}
const data = [Order.End, Order.Run, Order.Start];
const result = data.sort();
console.log(result);
A non-constant enum can even be mapped to the string values, as shown here:
enum Order {
Start = 0,
Run = 1,
End = 2,
}
const data = [Order.End, Order.Run, Order.Start];
const result = data.sort();
console.log(result.map((val) => Order[val]));
But in your case, you could convert them into an easily sortable value if necessary (assuming you desire to avoid alphabetical ordering).
const enum Order {
Start = 'Start',
Run = 'Run',
End = 'End',
}
const predicate = (a, b) => {
const map = {};
map[Order.Start] = 1;
map[Order.Run] = 2;
map[Order.End] = 3;
if (map[a] < map[b]) {
return -1;
}
if (map[a] > map[b]) {
return 1;
}
return 0;
}
const data = [Order.End, Order.Run, Order.Start];
const result = data.sort(predicate);
console.log(result);
answered Nov 26 '18 at 10:00
FentonFenton
154k42290313
Thanks for your answer! is it possible to get the ordinal number directly from typescript wit out using the map?
– Radex
Nov 26 '18 at 10:03
1
If you use a non-const enum with numeric values you can access the string names and the value. So the second example wherevalis the value andOrder[val]is the name. When using aconst enumevery use gets replaced with a literal value, so there isn't anywhere to store another value except in a separate map.
– Fenton
Nov 26 '18 at 10:09
add a comment |
4
4
4
Normally with an enum, the value is already comparable.
const enum Order {
Start = 0,
Run = 1,
End = 2,
}
const data = [Order.End, Order.Run, Order.Start];
const result = data.sort();
console.log(result);
A non-constant enum can even be mapped to the string values, as shown here:
enum Order {
Start = 0,
Run = 1,
End = 2,
}
const data = [Order.End, Order.Run, Order.Start];
const result = data.sort();
console.log(result.map((val) => Order[val]));
But in your case, you could convert them into an easily sortable value if necessary (assuming you desire to avoid alphabetical ordering).
const enum Order {
Start = 'Start',
Run = 'Run',
End = 'End',
}
const predicate = (a, b) => {
const map = {};
map[Order.Start] = 1;
map[Order.Run] = 2;
map[Order.End] = 3;
if (map[a] < map[b]) {
return -1;
}
if (map[a] > map[b]) {
return 1;
}
return 0;
}
const data = [Order.End, Order.Run, Order.Start];
const result = data.sort(predicate);
console.log(result);
answered Nov 26 '18 at 10:00
FentonFenton
154k42290313
Normally with an enum, the value is already comparable.
const enum Order {
Start = 0,
Run = 1,
End = 2,
}
const data = [Order.End, Order.Run, Order.Start];
const result = data.sort();
console.log(result);
A non-constant enum can even be mapped to the string values, as shown here:
enum Order {
Start = 0,
Run = 1,
End = 2,
}
const data = [Order.End, Order.Run, Order.Start];
const result = data.sort();
console.log(result.map((val) => Order[val]));
But in your case, you could convert them into an easily sortable value if necessary (assuming you desire to avoid alphabetical ordering).
const enum Order {
Start = 'Start',
Run = 'Run',
End = 'End',
}
const predicate = (a, b) => {
const map = {};
map[Order.Start] = 1;
map[Order.Run] = 2;
map[Order.End] = 3;
if (map[a] < map[b]) {
return -1;
}
if (map[a] > map[b]) {
return 1;
}
return 0;
}
const data = [Order.End, Order.Run, Order.Start];
const result = data.sort(predicate);
console.log(result);
answered Nov 26 '18 at 10:00
FentonFenton
154k42290313
answered Nov 26 '18 at 10:00
FentonFenton
154k42290313
answered Nov 26 '18 at 10:00
FentonFenton
154k42290313
answered Nov 26 '18 at 10:00
FentonFenton
154k42290313
154k42290313
Thanks for your answer! is it possible to get the ordinal number directly from typescript wit out using the map?
– Radex
Nov 26 '18 at 10:03
1
If you use a non-const enum with numeric values you can access the string names and the value. So the second example wherevalis the value andOrder[val]is the name. When using aconst enumevery use gets replaced with a literal value, so there isn't anywhere to store another value except in a separate map.
– Fenton
Nov 26 '18 at 10:09
add a comment |
Thanks for your answer! is it possible to get the ordinal number directly from typescript wit out using the map?
– Radex
Nov 26 '18 at 10:03
1
If you use a non-const enum with numeric values you can access the string names and the value. So the second example wherevalis the value andOrder[val]is the name. When using aconst enumevery use gets replaced with a literal value, so there isn't anywhere to store another value except in a separate map.
– Fenton
Nov 26 '18 at 10:09
Thanks for your answer! is it possible to get the ordinal number directly from typescript wit out using the map?
– Radex
Nov 26 '18 at 10:03
Thanks for your answer! is it possible to get the ordinal number directly from typescript wit out using the map?
– Radex
Nov 26 '18 at 10:03
1
1
If you use a non-const enum with numeric values you can access the string names and the value. So the second example where
val is the value and Order[val] is the name. When using a const enum every use gets replaced with a literal value, so there isn't anywhere to store another value except in a separate map.– Fenton
Nov 26 '18 at 10:09
If you use a non-const enum with numeric values you can access the string names and the value. So the second example where
val is the value and Order[val] is the name. When using a const enum every use gets replaced with a literal value, so there isn't anywhere to store another value except in a separate map.– Fenton
Nov 26 '18 at 10:09
add a comment |
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