Javascript Array reverse(arr)

(function() {/*w w  w  .j  a v  a 2 s  .  com*/
'use strict'
//reverse an array of integers in place
let arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

Array.prototype.reverse = Array.prototype.reverse || function(arr) {
    for(let i = 0; i < arr.length / 2; i++) {
        let opp =  arr.length - i - 1   
        arr[i] += arr[opp]
        arr[opp] = arr[i] - arr[opp]
        arr[i] -= arr[opp]
    }
}


arr.reverse()
arr.map((n) => console.log(n))
})()