Deleting array elements in JavaScript - delete vs splice

Question

What is the difference between using the delete operator on the array element as opposed to using the Array.splice method?

For example:

myArray = [\         


        

Answer 1

OK, imagine we have this array below:

const arr = [1, 2, 3, 4, 5];

Let's do delete first:

delete arr[1];

and this is the result:

[1, empty, 3, 4, 5];

empty! and let's get it:

arr[1]; //undefined

So means just the value deleted and it's undefined now, so length is the same, also it will return true...

Let's reset our array and do it with splice this time:

arr.splice(1, 1);

and this is the result this time:

[1, 3, 4, 5];

As you see the array length changed and arr[1] is 3 now...

Also this will return the deleted item in an Array which is [3] in this case...