Let’s try some practical examples: let friends = friends. Here is the syntax of the arguments for splice: arr.splice( start, deleteCount, newElem, newElem. For the third argument, you can add more additional arguments if you have a lot of elements to add to the array. The first argument is mandatory and the others are optional. The third parameter specifies the element you want to add(to the array).The second parameter specifies the total number of elements to be removed starting from the start index provided.The first parameter (start) specifies the index where an element should be inserted or removed.It returns removed elements in a new array. Unlike slice, the method splice mutates the original array. The method splice() is used to add and remove elements from an array in JavaScript. returns: 'Hello I love JavaScript' The splice method returns: 'JavaScript' console.log(str) Does not mutate the original string. slice(-10) // copy elements from the last index to the left 10 indices. slice(2) // slices from index 2 until the end. Here is an example: let str = 'Hello I love JavaScript' str. It does not mutate or change the original string.

Similar to the array method, the slice method for strings also slices parts of the string and returns it. The method slice() is a string method too. Īs you can see above, the method slice() does not mutate the original array, it only returns a copied array. console.log(languages) // the original array is not mutated.

slice(1,3) // languages.slice(2) //(from index 2 until the end of the array). Here is an example: let languages = languages. The second argument is not included, which means when you copy an array from index 1 to index 5, it will only copy from index 1 to index 4. The method slice() takes two arguments: the start index where you will start copying and the end index where the copying ends. It makes a shallow copy of the sliced array and returns the copied array. The method slice in JavaScript is used to copy pieces of an array.

Slice splice javascript