Use the Rest Operator with Function Parameters O

Tell us what’s happening:

Your code so far

const sum = (() => {
  "use strict";
  return function sum(...z) {
    const args = [ ...z ]
    return args.reduce((a, b) => a + b, 0);
console.log(sum(1, 2, 3)); // 6

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36.

Link to the challenge:

The rest operator is only used within a function’s parameter section.

When you write the above, z contains an array of all of the function’s arguments. The challenge is expecting you to use args in the parameter section instead of variable named z.