Immutable Array Element Deletion in JavaScript

Let's now learn how to perform immutable deletion of elements in an array. As an example, let's say we have some array:

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

Let the index for deletion be stored in the variable ind:

javascriptlet ind = 3;

Let's delete the element with the specified index. According to our approach, we should make a copy of the array and delete the element from the copy. Let's do this:

javascriptlet copy = Object.assign([], arr);
copy.splice(ind, 1);
let res = copy;

Let's use the second approach:

javascriptlet res = [
  ...arr.slice(0, ind),
  ...arr.slice(ind + 1)
];