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JavaScript Array slice() Method - GeeksforGeeks

JavaScript Array slice() Method

Last Updated : 12 Jul, 2024

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.

JavaScript


 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();

Output

[ 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.

JavaScript


 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();

Output

[ 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.

JavaScript


 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();

Output

[ 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.

JavaScript


 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();

Output

[
  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.

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