Which JavaScript Array functions are mutating?

You can find the list on MDN as Mutator methods (along with Accessor and Iteration methods):

You can also use .concat(), before using your mutation method, to ensure you are not mutating your arrays, eg

const dontMutateMe = [4,5,1,2,3];const sortArray = dontMutateMe.concat().sort(...)

javascript arrays mutable

I found this website called Doesitmutate

Have the list of all functions - and tells whether it mutates or not.

CodeHunter