When I have an array and I use splice to remove, let's say, the last element of the array. Is there a chance to create for example a button and when I click on it, it undoes the deleted action? Like using Ctrl + Z when write code and jump back in time? That means give me back the deleted element with all its characteristics?
Array.splice allows you to delete or insert elements, it also returns the removed elements when deleting. If you capture the deleted elements you can easily add them back:
let arr = [1,2,3,4,5,6];
// remove 1 element from index 1 ("2")
let removed = arr.splice(1, 1);
// add "2" back to position 1
arr.splice(1, 0, ...removed);
console.log(arr);If you don't have access to ES6's spread operator, you could use .shift() to get the first element out of removed:
let arr = [1,2,3,4,5,6];
// remove 1 element from index 1 ("2")
let removed = arr.splice(1, 1);
// add "2" back to position 1
arr.splice(1, 0, removed.shift());
console.log(arr);