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.Splice javascript: How To Use .splice() JS Array Method

  • July 4, 2023
  • Muhammad Ahmad
  • POSTED ON July 4, 2023
  • POSTED BY Muhammad Ahmad

There is a convenient way to store and manipulate collections of elements which is also stores different values in a single variable. When it comes to modifying arrays, JavaScript offers a powerful method called .splice().  This method enables developers to remove and/or add elements within an array, providing a flexible and efficient way to modify

There is a convenient way to store and manipulate collections of elements which is also stores different values in a single variable. When it comes to modifying arrays, JavaScript offers a powerful method called .splice(). 

This method enables developers to remove and/or add elements within an array, providing a flexible and efficient way to modify array contents. Whether you need to delete specific elements, insert new ones, or replace existing elements. JS splice offers the functionality to accomplish these tasks with ease.

While wading down this blog you will be getting closer to gaining a comprehensive understanding of how to leverage .splice javascript to remove, add, insert, and replace elements in an array.

Understanding the Syntax

The .splice() method’s syntax is as follows.

It is now easier to return the removed elements or adding new elements by using the splice javascript method. 

The syntax is:

.Splice javascript: How To Use .splice() JS Array Method 2

Here in this example the start represents the index point of modification, deleteCount represents the removable elements, and elements that would added are presented by item1 to itemN. 

For instance you will need to add two more elements to remove the previously added two elements, and for that purpose you will need to follow this code;

array.splice(0, 2, “new element 1”, “new element 2”)

Mentioned underneath are some of the reasons why Splice () method is used;

  • For removing elements from an array.
  • Adding new elements to any array.

Replace elements in an array

Removing elements from an array is one of the primary uses of .splice javascript. By specifying the start index and deleteCount, you can easily remove a range of elements. This versatile method ease the task of performing a variety of tasks on arrays.

This javascript splice method for Javascript Array objects allows programmers to change the existing elements with the new ones in any array via implementing the removing and replacing method. 

Among all the functions that javascript array splice method performs also includes the removal of elements from any array that helps improvisation of an existing array. 

Given below is the exact slice () method syntax code that you can use to perform this action. 

.Splice javascript: How To Use .splice() JS Array Method 3

How to use .splice javascript to remove array elements 

Suppose you have an array with named months but it also includes some day names in the array like shown in the example below;

.Splice javascript: How To Use .splice() JS Array Method 4

A mixed array of month and day names

To delete the day names from the months use the .splice javascript method and add them to a different array simultaneously.

.Splice javascript: How To Use .splice() JS Array Method 5

Creating an array of days

At least one parameter is required by the splice method which is usually the start index that helps starting the operations. As shown in the example above the elements from index 2 has been removed because number 2 was passed to the method. 

This is another way of removing elements from any array you want all you need to do is just pass a second number argument also known as the removeCount. This example shown below will help you understand the process of removing only one element by passing 1 number.

.Splice javascript: How To Use .splice() JS Array Method 6

How to remove only one element from the array?

The splice () will immediately remove all elements from the beginning index to the end of an array as soon as you will omit the RemoveCount parameter. 

How to add array elements with splice()?

The same method discussed above will help you insert new elements soon after the you perform the deletion operation. The only function required is that you will be passing elements you want to add after getting done with the delete count. The complete syntax for performing this splice method is given below. 

The full syntax of the splice() method is as follows.

.Splice javascript: How To Use .splice() JS Array Method 7

How to add new array elements without removing any elements?

Yes! It is possible to add new elements to an array without removing the existing method the process includes passing number 0 to the removeCount parameter. This is the most important to note while studying about javascript slice vs splice method that the one mentioned later will automatically return an empty array if no elements will be removed. Its up to you either you want to store returned empty array to a variable or not.

Since the splice() method returns an empty array, you don’t need to store the returned array:

The splice() method called without returning any elements.

.Splice javascript: How To Use .splice() JS Array Method 8

The Pros and Cons of Javascript Manipulation using the .splice() Method

It’s important to consider these pros and cons when deciding while learning about what is splice for array manipulation in JavaScript. Evaluate the specific requirements of your project and weigh the trade-offs to make an informed decision. 

Pros of JavaScript Manipulation using the .splice() Method


The .splice() method offers a high degree of flexibility in manipulating arrays. It allows you to remove, add, insert, or replace elements within an array, providing a wide range of possibilities for array manipulation.

In-Place Modification

Unlike some other array methods that create new arrays or return modified copies, .splice() modifies the original array directly. This can be advantageous when you want to perform array manipulation without creating unnecessary copies, leading to improved memory efficiency.

Precise Control

With .splice(), you have precise control over the start index and the number of elements to remove. This level of control allows you to fine-tune the modification process, ensuring that you achieve the desired outcome with accuracy.

Dynamic Modifications

The .splice() method allows you to dynamically modify arrays based on specific conditions or variables. You can use variables to determine the start index, delete count, or the elements to add, making it easy to create dynamic and responsive array manipulation logic.

Combination with Other Methods

.splice() can be combined with other array methods to perform more complex transformations. By leveraging the power of methods like .filter(), .map(), or .reduce(), you can create sophisticated array manipulation operations that go beyond simple element removal or addition.

Cons of JavaScript Manipulation using the .splice() Method

Modification of Original Array

While modifying the original array can be advantageous in some cases, it can also be a disadvantage. If you need to preserve the original array or keep track of changes separately, using .splice() directly on the original array may not be the best approach.

Array Mutability

JavaScript arrays are mutable by default, meaning that any modification to an array using .splice() or other array methods directly affects the original array. This mutability can introduce potential issues, such as unexpected changes in other parts of your code that rely on the original array’s state.

Complexity and Potential Bugs

The flexibility of .splice() can sometimes lead to complex code logic, especially when multiple modifications are involved or when combining it with other array methods. This complexity increases the likelihood of introducing bugs or making mistakes in the modification process.

Performance Considerations

While .splice() is generally efficient for small arrays or occasional modifications, it may not perform optimally for large arrays or frequent modifications. If you’re working with extensive datasets or performance-critical scenarios, using more specialized techniques or data structures might be more efficient.

Readability and Maintainability

Excessive use of .splice() with complex parameters can make the code harder to read and understand. It may become challenging to track the modifications and the resulting array state, leading to decreased code maintainability.


You’ve just learned how the splice() method works. Great job!

JavaScript’s .splice() method is a powerful tool for array manipulation, allowing you to remove, add, insert, or replace elements with ease. By understanding the syntax and exploring its various use cases, you can harness the full potential of .splice() and perform complex array operations efficiently. Whether you need to remove unwanted elements, insert new elements, or replace existing ones, .splice() offers the flexibility and versatility you require. Experiment with this method, and unlock a world of possibilities for manipulating arrays in JavaScript.

In this blog post, we have covered the fundamental aspects of .splice(). However, there are many more advanced techniques and creative use cases to explore. As you gain more experience and dive deeper into JavaScript, you will discover the true potential of .splice() and its role in array manipulation.


Muhammad Ahmad

Currently serving as the SEO Manager at vteams, Ahmed is a highly skilled individual with several years of experience of Digital Marketing.


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