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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' ]