And you're equipped with a handy mnemonic, that splice compared to slice has an additional letter, 'p', which helps you remember that splice mutates and optionally adds or removes from the original array. You now know that slice makes a shallow copy of the original array, while splice mutates the original array and optionally adds or removes elements. ConclusionĪnd there we have it! This blog goes over the differences between slice and splice. There are many methods associated with these arrays. And because splice can add and remove stuff to the original array, that means that it also mutates the original array. Javascript arrays are variables that can hold more than one value. Changing the internal structure of these elements will be reflected in both the original array and the returned object. Because of the extra letter, I associate the additional letter to splice's use of adding or removing from the original array. All built-in array-copy operations (spread syntax, om (), (), and ()) create shallow copies. splice has an extra letter, 'p', compared to slice. In JavaScript, an array is a data structure that is used to store and organize a collection of values or elements. I remember the difference between slice and splice using a mnemonic. insert 'juliet' and 'zeke' at 3rd index // returns Ĭonsole. splice ( 3, 1, 'juliet', 'zeke' ) // remove 'harper'.

Array slice in javascript