var array = [1, 2, 3, 4, 5]
console.log('array.slice(2)', array.slice(2));
// shows [3, 4, 5], returned selected element(s).
console.log('array.slice(-2)', array.slice(-2));
// shows [4, 5], returned selected element(s).
console.log('array', array);
// shows [1, 2, 3, 4, 5], original array remains intact.