Array.prototype.reverse()

const array1 = ["one", "two", "three"];
console.log("array1:", array1);
// Expected output: "array1:" Array ["one", "two", "three"]

const reversed = array1.reverse();
console.log("reversed:", reversed);
// Expected output: "reversed:" Array ["three", "two", "one"]

// Careful: reverse is destructive -- it changes the original array.
console.log("array1:", array1);
// Expected output: "array1:" Array ["three", "two", "one"]

a.reverse();

const a = [1, 2, 3];
console.log(a); // [1, 2, 3]

a.reverse();
console.log(a); // [3, 2, 1]