The splice should be used when you want to modify the original array by removing elements and adding new elements.When I started using JS methods it took me a while to get familiar and memorize the difference between the 3S and where I can get good use of split, slice, and splice. The purpose of the slice is to get only selected elements from array and it doesn't modify the original array. The syntax of using splice is array.splice(startingIndex, removeCounter, newElement(s))

You can remove specified elements as well as add new elements at the same time. You can add a new element in an array using splice on a specific index Splice can also return the selected elements from the array same as the slice but it modifies the original array.

The syntax of the slice is array.slice(startingIndex, elementCount).

It doesn't modify the original array but returns the number of elements.

For example you have an array of 10 elements and you want to just get 3 elements from 2nd index.

Slice just returns a specified number of elements from an array.

You can read more in detail about slice vs splice. I have researched and found 4 key points in slice and splice. These two methods are very confusing for beginners. Let’s clear up the confusion around the slice( ), splice( ), & split( ) methods in JavaScript Let newArray = array.splice(1, 3, 'a', 'b') parameterĪrray.splice(index, number of elements to be removed, element, element) Note: If we don’t define the second parameter, every element starting from the given index will be removed from the array // For adding elements, we need to give them as the 3rd, 4th. and the number of elements to be removedĪrray.splice(index, number of elements to be removed) Note: the Slice( ) method can also be used for strings.Īnd here is the splice syntax: //For removing elements, we need to give the index parameter, Here is the slice syntax: array.slice(from, until) The splice( ) method changes an array, by adding or removing elements from it. The slice( ) method copies a given part of an array and returns that copied part as a new array. Use negative numbers to select from the end of an array. If omitted, all elements from the start position and to the end of the array will be selected. An integer that specifies where to end the selection. Use negative numbers to select from the end of an array.Īrgument 2: Optional.

An integer that specifies where to start the selection (The first element has an index of 0). The new item(s) to be added to the array.Īrgument 1: Required. And if not passed, all item(s) from provided index will be removed.Īrgument 3.n: Optional. If set to 0(zero), no items will be removed. Splice() method can take n number of arguments:Īrgument 2: Optional. The splice() method changes the original array and slice() method doesn’t change the original array. The slice() method returns the selected element(s) in an array, as a new array object. The splice() method returns the removed items in an array.

Returns: An array containing the extracted elements. If end is negative it is treated as 'Math.max((array.length + begin),0)' as per spec (example provided below) effectively from the end of array. Last index for extraction but not including (default array.length). If begin is negative it is treated as 'Math.max((array.length + begin), 0)' as per spec (example provided below) effectively from the end of array. Remove last element (start -> array.length+start = 3)Ĭonsole.log('Elements deleted:', array.splice(-1, 1), 'mutated array:', array) Console.log('Elements deleted:', array.splice(0, 1), 'mutated array:', array)

Js splice split