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var a = [1, 2, 3, 4, 5, 6, 7, 800];

var n = a.length;

var b = [];

for (var i = n - 1; i >= 0; i--) {

b.push(a[i]);

}

for (var i = 0; i < n; i++) {

console.log(b[i]);

}