JavaScript Array slice() Method

The Array slice() method returns selected elements in an array as a new array. It selects from a given start, up to a (not inclusive) given end. This method does not change the original array, enabling non-destructive extraction of array segments.

Syntax:

arr.slice(begin, end);

Parameters:

• begin: This parameter defines the starting index from where the portion is to be extracted. If this argument is missing then the method takes begin as 0 as it is the default start value.
• end: Parameter specifying the end index for extracting a portion from an array, defaulting to array length if undefined, adjusting for exceeding length.

Return value:

This method returns a new array containing some portion of the original array. 

Example 1: Extracting elements between two indexes

Here, the slice() method extracts the array from the given array starting from index 2 and including all the elements less than index 4.

function func() {
    // Original Array
    let arr = [23, 56, 87, 32, 75, 13];
    // Extracted array
    let new_arr = arr.slice(2, 4);
    console.log(arr);
    console.log(new_arr);
}
func();

[ 23, 56, 87, 32, 75, 13 ]
[ 87, 32 ]

Example 2: Passing no arguments

Here, the slice() method extracts the entire array from the given string and returns it as the answer, Since no arguments were passed to it.

function func() {
    //Original Array
    let arr = [23, 56, 87, 32, 75, 13];
    //Extracted array
    let new_arr = arr.slice();
    console.log(arr);
    console.log(new_arr);
}
func();

[ 23, 56, 87, 32, 75, 13 ]
[ 23, 56, 87, 32, 75, 13 ]

Example 3: Extracting array from index 2

In this example, the slice() method extracts the array starting from index 2 till the end of the array and returns it as the answer.

function func() {

    //Original Array
    let arr = [23, 56, 87, 32, 75, 13];
    
    //Extracted array
    let new_arr = arr.slice(2);
    console.log(arr);
    console.log(new_arr);
}
func();

[ 23, 56, 87, 32, 75, 13 ]
[ 87, 32, 75, 13 ]

Example 4: Slicing the nested Array

In this example, the slice() method extracts the elements from the nested array and returns it as the answer.

function func() {

    // Original Array
    let arr = [23, [87, 32, 75, 27,3,10,18 ,13]];
    
    // Extracted array
    let new_arr = arr[1].slice(2, 4);
    console.log(arr);
    console.log(new_arr);
}
func();

[
  23,
  [
    87, 32, 75, 27,
     3, 10, 18, 13
  ]
]
[ 75, 27 ]

We have a complete list of Javascript Array methods, to check those please go through this Javascript Array Complete reference article.

Supported Browsers

• Google Chrome
• Edge
• Firefox
• Opera
• Safari