MaxInterview - adding to an array without mutating the original array

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1// since we will not be mutating, 
2// use const
3const arr1 = ['a', 'b', 'c', 'd', 'e'];
4
5const arr2 = [...arr1, 'f']; // ['a', 'b', 'c', 'd', 'e', 'f']
6const arr3 = ['z', ...arr1]; // ['z', 'a', 'b', 'c', 'd', 'e']
7

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