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const array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]; for (let i = 0; i < array.length; i += 2) { array.splice(i, 0, array.pop()); } console.log(array); /* run: [ 10, 1, 9, 2, 8, 3, 7, 4, 6, 5 ] */