The slice() method allows you to copy a specific portion of an array. It creates a new array containing only the selected elements.

• It takes a start index and an end index to decide which elements to extract.
• The element at the end index is not included in the result.
• It performs a non-destructive operation, so the original array is not changed.

let fruits = ["Apple", "Banana", "Mango", "Orange", "Grapes"];

let slicedFruits = fruits.slice(1, 4);

console.log(slicedFruits);

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

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();

• The slice() method is used to extract a portion of an array.
• It starts extracting elements from index 2.
• It includes all elements before index 4.
• Elements at index 2 and 3 are included in the result.

[Example 2]: Passing no arguments

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();

• The slice() method is called without any arguments.
• It extracts the entire string.
• All characters are included in the result.
• A new copy of the original string is returned.

[Example 3]: Extracting array from index 2

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();

• The slice() method starts extracting from index 2.
• It continues till the end of the array.
• All elements from index 2 onward are included.
• The extracted elements are returned as a new array.

[Example 4]: Slicing the nested Array

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();

• The slice() method is applied to a nested array.
• It extracts specific elements from the array.
• The selected elements are copied into a new array.
• The original nested array remains unchanged.