JavaScript method pop() to delete and return the last element of an array-JS Tutorial-php.cn

JavaScript method pop() to delete and return the last element of an array

黄舟

Release： 2017-11-03 11:17:31

Original

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Definition and Usage

pop() method is used to remove and return the last element of the array.

Syntax

arrayObject.pop()

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Return value

The last element of arrayObject.

Description

The pop() method will delete the last element of arrayObject, reduce the array length by 1, and return the value of the element it deletes. If the array is already empty, pop() does not modify the array and returns an undefined value.

Example

In this example, we will create an array and then delete the last element of the array. Note that this will also change the length of the array:

<script type="text/javascript">

var arr = new Array(3)
arr[0] = "George"
arr[1] = "John"
arr[2] = "Thomas"document.write(arr)document.write("<br />")document.write(arr.pop())document.write("<br />")document.write(arr)</script>

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Output:

George,John,Thomas
Thomas
George,John

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Here are the details of the parameters:

NA

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Return value:

Returns the element removed from the array.

Example:

<html>
<head>
<title>JavaScript Array pop Method</title>
</head>
<body>
<script type="text/javascript">
var numbers = [1, 4, 9];
 
var element = numbers.pop();
document.write("element is : " + element ); 
 
var element = numbers.pop();
document.write("<br />element is : " + element ); 
</script>
</body>
</html>

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This will produce the following results:

element is : 9
element is : 4

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