Hello Devs, In this article, we will discuss whats the difference between the two most important methods of Array in JavaScript (i.e Slice and Splice) The splice() method. Every parameter to splice() after the deleteCount parameter is treated as an element to add to the array at the startIndex. Difference between SLICE & SPLICE in JavaScript. For Example: var arr1 1,5,8,9 arr1. 1st Argument: Specifies from where the selection should be started. The splice() function is the only native array function that lets you add elements to the middle of an array.įor example, suppose you have an array and you want to add 'c' after 'b'. Slice: The Slice method takes 2 arguments. JavaScript arrays have a push() function that lets you add elements to the end of the array, and an unshift() function that lets you add elements to the beginning of the array. The splice() function also lets you add elements to the middle of the array. On the other hand, `splice()` modifies the array in place.Īrr2 = arr // false Adding Elements to the Middle `arr` still has 'c', because `filter()` doesn't modify the array // in place. Remove 1 element starting at index 2 const arr2 = arr.filter( ( v, i) => i != 2) This means filter() is the better choice for applications that rely on immutability, like React apps. The key difference between these two approaches is that filter() creates a new array. You may see JavaScript projects use filter() instead of splice() to remove elements from an array. The deleteCount parameter tells splice() how many elements to delete. The start parameter tells splice() where to start modifying the array. The first 2 parameters to splice() are called start and deleteCount. deleteCount (Optional value) : It is the number of elements. The syntax of the splice () method is as below : array.splice(startIndex, deleteCount, items) Here, startIndex : It is the start index of the array from where splice () will start deleting the items. Here's how you would remove 'c' using splice(): const arr = splice () can modify the array elements or we can say that it is a mutator method. The splice() function is the only native array function that lets you remove elements from the middle of the array without creating a new array. It is most commonly used to remove elements from an array, but it can also be used to add elements to the middle of an array. The Array#splice() function lets you modify an array in-place by adding and removing elements.

Slice and splice in javascript