JavaScript | Array sort()

arr.sort() function is used to sort the array in place in a given order according to the compare() function. If the function is omitted then the array is sorted in ascending order.

Syntax:
arr.sort([compareFunction])

Arguments
The only argument to this function is a compare function that is used to sort the elements according to different attributes and in the different order.

  • compareFunction(a,b) < 0
  • Then a comes before b in the answer.

  • compareFunction(a,b) > 0
  • Then b comes before a in the answer.

  • compareFunction(a,b) = 0
  • Then the order of a and b remains unchanged.

Return value
This function returns the reference of the sorted original array.



Examples for the above function are provided below:

Example 1:

var arr = [2, 5, 8, 1, 4]
print(arr.sort());
print(arr);

Output:

1,2,4,5,8
1,2,4,5,8

In this example the function sort() arranges the elements of the array in ascending order.

Example 2:

var arr = [2, 5, 8, 1, 4]
print(arr.sort(function(a, b) {
  return a + 2 * b;
}));
print(arr);

Output:

2,5,8,1,4
2,5,8,1,4

In this example the function sort() the elements of the array are sorted according the function applied on each element.

Codes for the above function are provided below:

Program 1:

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<script>
// JavaScript to illustrate sort() function
  
function func() {
  
    //Original string
    var arr = [2, 5, 8, 1, 4]
  
    //Sorting the array
    document.write(arr.sort());
    document.write("<br>");
    document.write(arr);
}
func();
</script>

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Output:

1,2,4,5,8
1,2,4,5,8

Program 2:

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<script>
// JavaScript to illustrate sort() function
  
function func() {
  
    // Original array
    var arr = [2, 5, 8, 1, 4];
  
    document.write(arr.sort(function(a, b) {
    return a + 2 * b;
}));
document.write("<br>");
document.write(arr);
}
func();
</script>

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Output:

4,1,8,5,2
4,1,8,5,2


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