【每日一题】- 2019-09-02 - 编程题 实现高阶函数combinedFetcher about fe-interview HOT 4 CLOSED

function fetch(arg) {
  return `response with: ${arg}`;
}
function fetcher(arg, cb){
	let res = fetch(arg);
	cb(res);
}
function combineddFetcher(...args) {
  const len = args.length;
  let cnt = 0;
  const res  = [];
  function innerCB(r, cb) {
    cnt++;
    res.push(r)
    if(cnt === len) cb(res);
  }
  
  return cb => args.forEach(arg => fetcher(arg, r => innerCB(r, cb)));
}

const fetchFruitsAndDrinks = combineddFetcher("fruits", "drinks");
fetchFruitsAndDrinks(console.log)