Examples
Math.max() returns the numerically greatest of its arguments. It works for an arbitrary number of arguments, but not for Arrays.
console.log(Math.max(...[-1, 5, 11, 3]))const arr1 = ['a', 'b'];
const arr2 = ['c', 'd'];
arr1.push(...arr2); // arr1 is now ['a', 'b', 'c', 'd']const arr1 = ['a', 'b'];
const arr2 = ['c'];
const arr3 = ['d', 'e'];
console.log([...arr1, ...arr2, ...arr3]); // [ 'a', 'b', 'c', 'd', 'e' ]