JavaScript Array sort() Method

Last Updated : 25 Jun, 2020

Below is the example of Array sort() method.

Program 1:

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

Output:
```
Geeks,for,Geeks
Geeks,Geeks,for
```

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

arr.sort(compareFunction)

Parameters: This method accept a single parameter as mentioned above and described below:

compareFunction: This parameters 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 method returns the reference of the sorted original array.

Below examples illustrate the JavaScript Array sort() method:

Example 1: In this example the sort() method arranges the elements of the array in ascending order.

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

Output:

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

Example 2: In this example the sort() method the elements of the array are sorted according the function applied on each element.

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

Output:

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

Code for the above method is provided below:
Program 1:

<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>

Output:

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

Program 2:

<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>