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();
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.
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.
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.
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.
