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. Apply another splice() method on the resulted array after the first splice(), in order to replace the element June which is at index 4 (in the output array of the first splice() method) by the element May. It now boasts over 13 million page views per month, a strong ecosystem of documentation and data, and a lively community. Initialize an array and then we applied the splice() method on it resulting the insertion of the element February at index 1 without removing any element.

And because splice can add and remove stuff to the original array, that means that it also mutates the original array. MDN Web Docs (formerly MDN) was first launched by Mozilla around 2005, and has grown from humble beginnings to being one of the most popular web development resources on the web today. Because of the extra letter, I associate the additional letter to splice's use of adding or removing from the original array. If you don't specify any elements, splice simply removes the elements from the array. Try it Syntax slice(indexStart) slice(indexStart, inde圎nd) Parameters indexStart The index of the first character to include in the returned substring. In some situations, you can also use it to separate an array which has mixed content as in the case above. Great job The splice() method is mostly used when you need to delete or add new elements to an array. You've just learned how the splice() method works. , elementN The elements to add to the array. The slice () method extracts a section of a string and returns it as a new string, without modifying the original string. The splice() method called without returning any elements Conclusion. The splice () method overwrites the original array. If howMany is 0, no elements are removed. Definition and Usage The splice () method adds and/or removes array elements. howMany An integer indicating the number of old array elements to remove. splice has an extra letter, 'p', compared to slice. index Index at which to start changing the array. Thanks for filing Please be very specific about which part of the doc is wrong. I remember the difference between slice and splice using a mnemonic. Both methods do the same thing only one directly modifies an array as Array.splice does, and the other returns a copy which is the case with Array. So there is also the core js Array.slice, and splice methods that can be used to drop elements from the beging of an array, of any part of it actually. const months 'Jan', 'March', 'April', 'June' months.splice(1, 0, 'Feb') // inserts at index 1 console.log(months) // expected output: Array 'Jan', 'Feb. insert 'juliet' and 'zeke' at 3rd index // returns Ĭonsole. 3 - What about Array.splice, and Array.slice. splice ( 3, 1, 'juliet', 'zeke' ) // remove 'harper'.

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