Array.prototype.reverse
reverses the contents of an array in place (with mutation)…
Is there a similarly simple strategy for reversing an array without altering the contents of the original array (without mutation)?
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Answer
You can use slice() to make a copy then reverse() it
var newarray = array.slice().reverse();
var array = ['a', 'b', 'c', 'd', 'e']; var newarray = array.slice().reverse(); console.log('a', array); console.log('na', newarray);