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JavaScript | Array pop()

arr.pop() function is used to remove the last element of the array and also returns the removed element. This function decreases the length of the array by 1. The syntax of this function is as follows:

arr.pop()

Arguments
This function does not have any argument.

Return value
This function returns the removed element. If the array is empty, then this function returns undefined.

Examples for the above function are provided below:

Example 1:



var arr = [34, 234, 567, 4];
var popped = arr.pop();
print(popped);
print(arr);

Output:

4
34,234,567

In this example the function pop() removes the last element from the array, which is 4 and returns it.

Example 2:

var arr = [];
var popped = arr.pop();
print(popped);

Output:

undefined

In this example the function pop() tries to extract the last element of the array but since the array is empty therefore it returns undefined as the answer.

Codes for the above function are provided below:

Program 1:

<script>
// JavaScript code to illustrate pop() function
  
function func() {
    var arr = [34, 234, 567, 4];
  
    // popping the last element from the array 
    var popped = arr.pop();
    document.write(popped);
    document.write("<br>");
    document.write(arr);
}
func();
</script>

Output:

4
34,234,567

Program 2:

// JavaScript to illustrate pop() function
<script>
function func() {
  
    var arr = [];
  
    // popping the last element
    var popped = arr.pop();
    document.write(popped);
}
func();
</script>

Output:

undefined


This article is attributed to GeeksforGeeks.org

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