How to use the splice() method In Javascript

Q: How to use the splice() method In Javascript

The splice() method is used to insert or replace the contents of an array at a specific index. This can be used to insert the new string at the position of the array.

Method 1: Using the slice() method

Method 3: Using JavaScript substring() method

The splice() method is used to insert or replace the contents of an array at a specific index. This can be used to insert the new string at the position of the array.

It takes 3 parameters, the index where the string is to be inserted, the number of deletions to be performed if any, and the string to be inserted.
The required index and the string are passed as parameters to this method with the deletions parameter set to 0. It inserts the string into the array.
The array is joined back using the join() method. This makes it one whole string again with the new string joined in between.

Syntax:

str.splice(index, 0, element);

Example: This example shows the above-explained approach.

Javascript

// Input String
let origString = "GeeksGeeks";

// String to be added
let stringToAdd = "For";

// Position to add string
let indexPosition = 5;

// Split the string into individual
// characters
origString = origString.split('');
    
// Insert the string at the index position
origString.splice(indexPosition, 0, stringToAdd);
    
// Join back the individual characters
// to form a new string
newString = origString.join('');
    
// Display output
console.log(newString);

Output

w3wiki

How to insert a string at a specific index in JavaScript ?

In this article, we are given a string containing words and the task is to insert a new string at a given index. Inserting string at a particular position means increasing the length of the original string.There are some methods like slice( ), splice( ), and substring( ) to solve this problem which are discussed below: