# Manipulations with elements in JavaScript

Let's do something with the iterated elements of the array, for example, write the sign `'!'` at the end of them. In this case, we'll have to use the ordinary `for` loop instead of `for-of`, like this:

`function func(arr) { for (let i = 0; i < arr.length; i++) { if (typeof arr[i] == 'object') { arr[i] = func(arr[i]); } else { arr[i] = arr[i] + '!'; } } return arr; } console.log(func([1, [2, 7, 8], [3, 4, [5, 6]]]));`

Given a multidimensional array of arbitrary nesting level, for example, this:

`[1, [2, 7, 8], [3, 4], [5, [6, 7]]]`

Square all elements-numbers of this array.

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