Function doubleNumbers

w2/d3/callbacks.js:93–102

(numbers, cb)

// console.log('==>',res);

function doubleNumbers(numbers, cb) {
  let doubled = [];

  for (let num of numbers) {
    let doubledNum = cb(num);
    doubled.push(doubledNum);
  }

  return doubled;
}

let double = (num) => num * 2;