I keep getting cannot read property error
-2
I am trying to do a bubblesort. I am using this algorithm to sort a 2d array and I keep getting an error. Here is the function:
var array = [
[ "Rober Hill" , 123.54 ],
[ "Chrsitopher Reddkin", 54.67 ],
[ "Maggie Woods" , 1000.87 ],
[ "Jennifer Jones" , 3.34 ],
[ "Marcus Parker" , 64.98 ]
];
table = document.getElementById("table");
function bubbleSort(array, length, element)
{
var swapped = false;
do
{
for (var a = 0; a < 5; a++) // Line 59
{
if (array[a][1] > array[a+1][1])
{
var temp = array[a][1];
array[a][1] = array[a+1][1];
array[a+1][1] = temp;
swapped = true;
}
}
} while(swapped);
return array;
}
The error says: Sorting.html:59 Uncaught TypeError: Cannot read property '0' of undefined. I have this function on a button. Any kind of help would be nice! Thank you
javascript
edited Nov 26 '18 at 4:28
Thum Choon Tat
2,02811216
asked Nov 26 '18 at 3:11
Edrian YumangEdrian Yumang
12
|
show 1 more comment
-2
I am trying to do a bubblesort. I am using this algorithm to sort a 2d array and I keep getting an error. Here is the function:
var array = [
[ "Rober Hill" , 123.54 ],
[ "Chrsitopher Reddkin", 54.67 ],
[ "Maggie Woods" , 1000.87 ],
[ "Jennifer Jones" , 3.34 ],
[ "Marcus Parker" , 64.98 ]
];
table = document.getElementById("table");
function bubbleSort(array, length, element)
{
var swapped = false;
do
{
for (var a = 0; a < 5; a++) // Line 59
{
if (array[a][1] > array[a+1][1])
{
var temp = array[a][1];
array[a][1] = array[a+1][1];
array[a+1][1] = temp;
swapped = true;
}
}
} while(swapped);
return array;
}
The error says: Sorting.html:59 Uncaught TypeError: Cannot read property '0' of undefined. I have this function on a button. Any kind of help would be nice! Thank you
javascript
edited Nov 26 '18 at 4:28
Thum Choon Tat
2,02811216
asked Nov 26 '18 at 3:11
Edrian YumangEdrian Yumang
12
Which is line 59?
– Thum Choon Tat
Nov 26 '18 at 3:31
line 59: for (var a = 0; a < 5; a++)
– Edrian Yumang
Nov 26 '18 at 3:37
1
Possible for you to create a working demo for myself and others to work with?
– NewToJS
Nov 26 '18 at 3:41
1
Maybe this JsFiddle Demo might be of some help. I don't know what you want to order them by but credit to This Answer for the function source code used in my example.
– NewToJS
Nov 26 '18 at 3:59
I doubt very much that is line 59. The error messages in the console are typically clickable and will take you directly to the source code.
– Phil
Nov 26 '18 at 4:58
|
show 1 more comment
-2
-2
-2
I am trying to do a bubblesort. I am using this algorithm to sort a 2d array and I keep getting an error. Here is the function:
var array = [
[ "Rober Hill" , 123.54 ],
[ "Chrsitopher Reddkin", 54.67 ],
[ "Maggie Woods" , 1000.87 ],
[ "Jennifer Jones" , 3.34 ],
[ "Marcus Parker" , 64.98 ]
];
table = document.getElementById("table");
function bubbleSort(array, length, element)
{
var swapped = false;
do
{
for (var a = 0; a < 5; a++) // Line 59
{
if (array[a][1] > array[a+1][1])
{
var temp = array[a][1];
array[a][1] = array[a+1][1];
array[a+1][1] = temp;
swapped = true;
}
}
} while(swapped);
return array;
}
The error says: Sorting.html:59 Uncaught TypeError: Cannot read property '0' of undefined. I have this function on a button. Any kind of help would be nice! Thank you
javascript
edited Nov 26 '18 at 4:28
Thum Choon Tat
2,02811216
asked Nov 26 '18 at 3:11
Edrian YumangEdrian Yumang
12
I am trying to do a bubblesort. I am using this algorithm to sort a 2d array and I keep getting an error. Here is the function:
var array = [
[ "Rober Hill" , 123.54 ],
[ "Chrsitopher Reddkin", 54.67 ],
[ "Maggie Woods" , 1000.87 ],
[ "Jennifer Jones" , 3.34 ],
[ "Marcus Parker" , 64.98 ]
];
table = document.getElementById("table");
function bubbleSort(array, length, element)
{
var swapped = false;
do
{
for (var a = 0; a < 5; a++) // Line 59
{
if (array[a][1] > array[a+1][1])
{
var temp = array[a][1];
array[a][1] = array[a+1][1];
array[a+1][1] = temp;
swapped = true;
}
}
} while(swapped);
return array;
}
The error says: Sorting.html:59 Uncaught TypeError: Cannot read property '0' of undefined. I have this function on a button. Any kind of help would be nice! Thank you
javascript
javascript
edited Nov 26 '18 at 4:28
Thum Choon Tat
2,02811216
asked Nov 26 '18 at 3:11
Edrian YumangEdrian Yumang
12
edited Nov 26 '18 at 4:28
Thum Choon Tat
2,02811216
asked Nov 26 '18 at 3:11
Edrian YumangEdrian Yumang
12
edited Nov 26 '18 at 4:28
Thum Choon Tat
2,02811216
edited Nov 26 '18 at 4:28
Thum Choon Tat
2,02811216
edited Nov 26 '18 at 4:28
Thum Choon Tat
2,02811216
2,02811216
asked Nov 26 '18 at 3:11
Edrian YumangEdrian Yumang
12
asked Nov 26 '18 at 3:11
Edrian YumangEdrian Yumang
12
asked Nov 26 '18 at 3:11
Edrian YumangEdrian Yumang
12
12
Which is line 59?
– Thum Choon Tat
Nov 26 '18 at 3:31
line 59: for (var a = 0; a < 5; a++)
– Edrian Yumang
Nov 26 '18 at 3:37
1
Possible for you to create a working demo for myself and others to work with?
– NewToJS
Nov 26 '18 at 3:41
1
Maybe this JsFiddle Demo might be of some help. I don't know what you want to order them by but credit to This Answer for the function source code used in my example.
– NewToJS
Nov 26 '18 at 3:59
I doubt very much that is line 59. The error messages in the console are typically clickable and will take you directly to the source code.
– Phil
Nov 26 '18 at 4:58
|
show 1 more comment
Which is line 59?
– Thum Choon Tat
Nov 26 '18 at 3:31
line 59: for (var a = 0; a < 5; a++)
– Edrian Yumang
Nov 26 '18 at 3:37
1
Possible for you to create a working demo for myself and others to work with?
– NewToJS
Nov 26 '18 at 3:41
1
Maybe this JsFiddle Demo might be of some help. I don't know what you want to order them by but credit to This Answer for the function source code used in my example.
– NewToJS
Nov 26 '18 at 3:59
I doubt very much that is line 59. The error messages in the console are typically clickable and will take you directly to the source code.
– Phil
Nov 26 '18 at 4:58
Which is line 59?
– Thum Choon Tat
Nov 26 '18 at 3:31
Which is line 59?
– Thum Choon Tat
Nov 26 '18 at 3:31
line 59: for (var a = 0; a < 5; a++)
– Edrian Yumang
Nov 26 '18 at 3:37
line 59: for (var a = 0; a < 5; a++)
– Edrian Yumang
Nov 26 '18 at 3:37
1
1
Possible for you to create a working demo for myself and others to work with?
– NewToJS
Nov 26 '18 at 3:41
Possible for you to create a working demo for myself and others to work with?
– NewToJS
Nov 26 '18 at 3:41
1
1
Maybe this JsFiddle Demo might be of some help. I don't know what you want to order them by but credit to This Answer for the function source code used in my example.
– NewToJS
Nov 26 '18 at 3:59
Maybe this JsFiddle Demo might be of some help. I don't know what you want to order them by but credit to This Answer for the function source code used in my example.
– NewToJS
Nov 26 '18 at 3:59
I doubt very much that is line 59. The error messages in the console are typically clickable and will take you directly to the source code.
– Phil
Nov 26 '18 at 4:58
I doubt very much that is line 59. The error messages in the console are typically clickable and will take you directly to the source code.
– Phil
Nov 26 '18 at 4:58
|
show 1 more comment
2 Answers
2
active
oldest
votes
1
Running your code exactly as it is, I get:
Cannot read property '1' of undefined
This is because in your comparison, you're attempting to compare array[a][1] > array[a+1][1], and this works except for the last loop, where array[a+1] doesn't exist, and because it doesn't exist, 1 is undefined.
Here's a working solution, with a few notable differences.
- I don't know why you had
length, andelementas parameters for yourbubbleSort, but they're gone now - You can just use the array length in your for loop, that way if you add more items to your array, you don't have to update the
5you had hardcoded. - In the
forloop, I minus 1 from the array length so we're never trying to compare the last item against an item after it that doesn't exist. - Also, I used
iinstead ofa, since that's a common variable name for an incrementer. - I defined
swappedinside thedo...while, otherwise you'll have created an infinite loop becauseswappedwill get set totrueon the first pass and staytrueforever. - You don't have to return the array, as it is modifying the original in place when you call
bubbleSort
var array = [
["Rober Hill", 123.54],
["Chrsitopher Reddkin", 54.67],
["Maggie Woods", 1000.87],
["Jennifer Jones", 3.34],
["Marcus Parker", 64.98]
];
function bubbleSort(array) {
do {
var swapped = false;
for (var i = 0; i < array.length - 1; i++) {
if (array[i][1] > array[i + 1][1]) {
var temp = array[i];
array[i] = array[i + 1];
array[i + 1] = temp;
swapped = true;
}
}
} while (swapped);
}
bubbleSort(array)
console.log(array);answered Nov 26 '18 at 5:03
AnonymousSBAnonymousSB
2,194221
add a comment |
0
Move var swapped = false; inside do {....
Also update condition in for it should be like a < 4; or it's better if you use generalized condition as a < array.length - 1;
var array = [
["Rober Hill", 123.54],
["Chrsitopher Reddkin", 54.67],
["Maggie Woods", 1000.87],
["Jennifer Jones", 3.34],
["Marcus Parker", 64.98]
];
function bubbleSort(array, length, element) {
do {
var swapped = false;
for (var a = 0; a < array.length - 1; a++) // Line 59
{
if (array[a][1] > array[a + 1][1]) {
var temp = array[a][1];
array[a][1] = array[a + 1][1];
array[a + 1][1] = temp;
swapped = true;
}
}
} while (swapped);
return array;
}
console.log(bubbleSort(array));answered Nov 26 '18 at 4:58
KaranKaran
3,2082424
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
1
Running your code exactly as it is, I get:
Cannot read property '1' of undefined
This is because in your comparison, you're attempting to compare array[a][1] > array[a+1][1], and this works except for the last loop, where array[a+1] doesn't exist, and because it doesn't exist, 1 is undefined.
Here's a working solution, with a few notable differences.
- I don't know why you had
length, andelementas parameters for yourbubbleSort, but they're gone now - You can just use the array length in your for loop, that way if you add more items to your array, you don't have to update the
5you had hardcoded. - In the
forloop, I minus 1 from the array length so we're never trying to compare the last item against an item after it that doesn't exist. - Also, I used
iinstead ofa, since that's a common variable name for an incrementer. - I defined
swappedinside thedo...while, otherwise you'll have created an infinite loop becauseswappedwill get set totrueon the first pass and staytrueforever. - You don't have to return the array, as it is modifying the original in place when you call
bubbleSort
var array = [
["Rober Hill", 123.54],
["Chrsitopher Reddkin", 54.67],
["Maggie Woods", 1000.87],
["Jennifer Jones", 3.34],
["Marcus Parker", 64.98]
];
function bubbleSort(array) {
do {
var swapped = false;
for (var i = 0; i < array.length - 1; i++) {
if (array[i][1] > array[i + 1][1]) {
var temp = array[i];
array[i] = array[i + 1];
array[i + 1] = temp;
swapped = true;
}
}
} while (swapped);
}
bubbleSort(array)
console.log(array);answered Nov 26 '18 at 5:03
AnonymousSBAnonymousSB
2,194221
add a comment |
1
Running your code exactly as it is, I get:
Cannot read property '1' of undefined
This is because in your comparison, you're attempting to compare array[a][1] > array[a+1][1], and this works except for the last loop, where array[a+1] doesn't exist, and because it doesn't exist, 1 is undefined.
Here's a working solution, with a few notable differences.
- I don't know why you had
length, andelementas parameters for yourbubbleSort, but they're gone now - You can just use the array length in your for loop, that way if you add more items to your array, you don't have to update the
5you had hardcoded. - In the
forloop, I minus 1 from the array length so we're never trying to compare the last item against an item after it that doesn't exist. - Also, I used
iinstead ofa, since that's a common variable name for an incrementer. - I defined
swappedinside thedo...while, otherwise you'll have created an infinite loop becauseswappedwill get set totrueon the first pass and staytrueforever. - You don't have to return the array, as it is modifying the original in place when you call
bubbleSort
var array = [
["Rober Hill", 123.54],
["Chrsitopher Reddkin", 54.67],
["Maggie Woods", 1000.87],
["Jennifer Jones", 3.34],
["Marcus Parker", 64.98]
];
function bubbleSort(array) {
do {
var swapped = false;
for (var i = 0; i < array.length - 1; i++) {
if (array[i][1] > array[i + 1][1]) {
var temp = array[i];
array[i] = array[i + 1];
array[i + 1] = temp;
swapped = true;
}
}
} while (swapped);
}
bubbleSort(array)
console.log(array);answered Nov 26 '18 at 5:03
AnonymousSBAnonymousSB
2,194221
add a comment |
1
1
1
Running your code exactly as it is, I get:
Cannot read property '1' of undefined
This is because in your comparison, you're attempting to compare array[a][1] > array[a+1][1], and this works except for the last loop, where array[a+1] doesn't exist, and because it doesn't exist, 1 is undefined.
Here's a working solution, with a few notable differences.
- I don't know why you had
length, andelementas parameters for yourbubbleSort, but they're gone now - You can just use the array length in your for loop, that way if you add more items to your array, you don't have to update the
5you had hardcoded. - In the
forloop, I minus 1 from the array length so we're never trying to compare the last item against an item after it that doesn't exist. - Also, I used
iinstead ofa, since that's a common variable name for an incrementer. - I defined
swappedinside thedo...while, otherwise you'll have created an infinite loop becauseswappedwill get set totrueon the first pass and staytrueforever. - You don't have to return the array, as it is modifying the original in place when you call
bubbleSort
var array = [
["Rober Hill", 123.54],
["Chrsitopher Reddkin", 54.67],
["Maggie Woods", 1000.87],
["Jennifer Jones", 3.34],
["Marcus Parker", 64.98]
];
function bubbleSort(array) {
do {
var swapped = false;
for (var i = 0; i < array.length - 1; i++) {
if (array[i][1] > array[i + 1][1]) {
var temp = array[i];
array[i] = array[i + 1];
array[i + 1] = temp;
swapped = true;
}
}
} while (swapped);
}
bubbleSort(array)
console.log(array);answered Nov 26 '18 at 5:03
AnonymousSBAnonymousSB
2,194221
Running your code exactly as it is, I get:
Cannot read property '1' of undefined
This is because in your comparison, you're attempting to compare array[a][1] > array[a+1][1], and this works except for the last loop, where array[a+1] doesn't exist, and because it doesn't exist, 1 is undefined.
Here's a working solution, with a few notable differences.
- I don't know why you had
length, andelementas parameters for yourbubbleSort, but they're gone now - You can just use the array length in your for loop, that way if you add more items to your array, you don't have to update the
5you had hardcoded. - In the
forloop, I minus 1 from the array length so we're never trying to compare the last item against an item after it that doesn't exist. - Also, I used
iinstead ofa, since that's a common variable name for an incrementer. - I defined
swappedinside thedo...while, otherwise you'll have created an infinite loop becauseswappedwill get set totrueon the first pass and staytrueforever. - You don't have to return the array, as it is modifying the original in place when you call
bubbleSort
var array = [
["Rober Hill", 123.54],
["Chrsitopher Reddkin", 54.67],
["Maggie Woods", 1000.87],
["Jennifer Jones", 3.34],
["Marcus Parker", 64.98]
];
function bubbleSort(array) {
do {
var swapped = false;
for (var i = 0; i < array.length - 1; i++) {
if (array[i][1] > array[i + 1][1]) {
var temp = array[i];
array[i] = array[i + 1];
array[i + 1] = temp;
swapped = true;
}
}
} while (swapped);
}
bubbleSort(array)
console.log(array);var array = [
["Rober Hill", 123.54],
["Chrsitopher Reddkin", 54.67],
["Maggie Woods", 1000.87],
["Jennifer Jones", 3.34],
["Marcus Parker", 64.98]
];
function bubbleSort(array) {
do {
var swapped = false;
for (var i = 0; i < array.length - 1; i++) {
if (array[i][1] > array[i + 1][1]) {
var temp = array[i];
array[i] = array[i + 1];
array[i + 1] = temp;
swapped = true;
}
}
} while (swapped);
}
bubbleSort(array)
console.log(array);var array = [
["Rober Hill", 123.54],
["Chrsitopher Reddkin", 54.67],
["Maggie Woods", 1000.87],
["Jennifer Jones", 3.34],
["Marcus Parker", 64.98]
];
function bubbleSort(array) {
do {
var swapped = false;
for (var i = 0; i < array.length - 1; i++) {
if (array[i][1] > array[i + 1][1]) {
var temp = array[i];
array[i] = array[i + 1];
array[i + 1] = temp;
swapped = true;
}
}
} while (swapped);
}
bubbleSort(array)
console.log(array);answered Nov 26 '18 at 5:03
AnonymousSBAnonymousSB
2,194221
edited Nov 26 '18 at 5:15
answered Nov 26 '18 at 5:03
AnonymousSBAnonymousSB
2,194221
answered Nov 26 '18 at 5:03
AnonymousSBAnonymousSB
2,194221
answered Nov 26 '18 at 5:03
AnonymousSBAnonymousSB
2,194221
2,194221
add a comment |
add a comment |
0
Move var swapped = false; inside do {....
Also update condition in for it should be like a < 4; or it's better if you use generalized condition as a < array.length - 1;
var array = [
["Rober Hill", 123.54],
["Chrsitopher Reddkin", 54.67],
["Maggie Woods", 1000.87],
["Jennifer Jones", 3.34],
["Marcus Parker", 64.98]
];
function bubbleSort(array, length, element) {
do {
var swapped = false;
for (var a = 0; a < array.length - 1; a++) // Line 59
{
if (array[a][1] > array[a + 1][1]) {
var temp = array[a][1];
array[a][1] = array[a + 1][1];
array[a + 1][1] = temp;
swapped = true;
}
}
} while (swapped);
return array;
}
console.log(bubbleSort(array));answered Nov 26 '18 at 4:58
KaranKaran
3,2082424
add a comment |
0
Move var swapped = false; inside do {....
Also update condition in for it should be like a < 4; or it's better if you use generalized condition as a < array.length - 1;
var array = [
["Rober Hill", 123.54],
["Chrsitopher Reddkin", 54.67],
["Maggie Woods", 1000.87],
["Jennifer Jones", 3.34],
["Marcus Parker", 64.98]
];
function bubbleSort(array, length, element) {
do {
var swapped = false;
for (var a = 0; a < array.length - 1; a++) // Line 59
{
if (array[a][1] > array[a + 1][1]) {
var temp = array[a][1];
array[a][1] = array[a + 1][1];
array[a + 1][1] = temp;
swapped = true;
}
}
} while (swapped);
return array;
}
console.log(bubbleSort(array));answered Nov 26 '18 at 4:58
KaranKaran
3,2082424
add a comment |
0
0
0
Move var swapped = false; inside do {....
Also update condition in for it should be like a < 4; or it's better if you use generalized condition as a < array.length - 1;
var array = [
["Rober Hill", 123.54],
["Chrsitopher Reddkin", 54.67],
["Maggie Woods", 1000.87],
["Jennifer Jones", 3.34],
["Marcus Parker", 64.98]
];
function bubbleSort(array, length, element) {
do {
var swapped = false;
for (var a = 0; a < array.length - 1; a++) // Line 59
{
if (array[a][1] > array[a + 1][1]) {
var temp = array[a][1];
array[a][1] = array[a + 1][1];
array[a + 1][1] = temp;
swapped = true;
}
}
} while (swapped);
return array;
}
console.log(bubbleSort(array));answered Nov 26 '18 at 4:58
KaranKaran
3,2082424
Move var swapped = false; inside do {....
Also update condition in for it should be like a < 4; or it's better if you use generalized condition as a < array.length - 1;
var array = [
["Rober Hill", 123.54],
["Chrsitopher Reddkin", 54.67],
["Maggie Woods", 1000.87],
["Jennifer Jones", 3.34],
["Marcus Parker", 64.98]
];
function bubbleSort(array, length, element) {
do {
var swapped = false;
for (var a = 0; a < array.length - 1; a++) // Line 59
{
if (array[a][1] > array[a + 1][1]) {
var temp = array[a][1];
array[a][1] = array[a + 1][1];
array[a + 1][1] = temp;
swapped = true;
}
}
} while (swapped);
return array;
}
console.log(bubbleSort(array));var array = [
["Rober Hill", 123.54],
["Chrsitopher Reddkin", 54.67],
["Maggie Woods", 1000.87],
["Jennifer Jones", 3.34],
["Marcus Parker", 64.98]
];
function bubbleSort(array, length, element) {
do {
var swapped = false;
for (var a = 0; a < array.length - 1; a++) // Line 59
{
if (array[a][1] > array[a + 1][1]) {
var temp = array[a][1];
array[a][1] = array[a + 1][1];
array[a + 1][1] = temp;
swapped = true;
}
}
} while (swapped);
return array;
}
console.log(bubbleSort(array));var array = [
["Rober Hill", 123.54],
["Chrsitopher Reddkin", 54.67],
["Maggie Woods", 1000.87],
["Jennifer Jones", 3.34],
["Marcus Parker", 64.98]
];
function bubbleSort(array, length, element) {
do {
var swapped = false;
for (var a = 0; a < array.length - 1; a++) // Line 59
{
if (array[a][1] > array[a + 1][1]) {
var temp = array[a][1];
array[a][1] = array[a + 1][1];
array[a + 1][1] = temp;
swapped = true;
}
}
} while (swapped);
return array;
}
console.log(bubbleSort(array));answered Nov 26 '18 at 4:58
KaranKaran
3,2082424
answered Nov 26 '18 at 4:58
KaranKaran
3,2082424
answered Nov 26 '18 at 4:58
KaranKaran
3,2082424
answered Nov 26 '18 at 4:58
KaranKaran
3,2082424
3,2082424
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Which is line 59?
– Thum Choon Tat
Nov 26 '18 at 3:31
line 59: for (var a = 0; a < 5; a++)
– Edrian Yumang
Nov 26 '18 at 3:37
1
Possible for you to create a working demo for myself and others to work with?
– NewToJS
Nov 26 '18 at 3:41
1
Maybe this JsFiddle Demo might be of some help. I don't know what you want to order them by but credit to This Answer for the function source code used in my example.
– NewToJS
Nov 26 '18 at 3:59
I doubt very much that is line 59. The error messages in the console are typically clickable and will take you directly to the source code.
– Phil
Nov 26 '18 at 4:58