indongyoo

const { curry2 } = Functional;
const then = curry2((f, a) => a instanceof Promise ? a.then(f) : f(a));

const add10 = then(a => a + 10);
const add100 = then(a => a + 100);
const log = then(console.log);

log(add100(add10(num(5)))); // 즉시 115
log(add100(add10(numP(6)))); // 1초 뒤 116

indongyoo

<div id="el1"></div>
<div id="el2"></div>

<script>
function loadImage(src) {
  return new Promise(function(resolve) {
    var image = new Image();
    image.onload = function() { resolve(image); };
    image.src = src;
  });

indongyoo

const mapC = curry2((f, coll) =>
  map(([a]) => a,
    map(a => [f(a)], coll)));

go([1, 2, 3],
  map(add10),
  console.log); // 3초 뒤 [11, 12, 13]

go([4, 5, 6],
  mapC(add10),

indongyoo

const { mapC } = Functional;

let start;
const reset = _ => start = new Date();
const check = _ => parseInt((new Date() - start) / 1000);

const add10 = a => new Promise(function(resolve) {
  console.log(`들어온 시간: ${check()}초 뒤`);
  setTimeout(function() {
    resolve(a + 10);

indongyoo

const team1 = {
  name: 'italy',
  skaters: [
    { name: 'i1', time: 3000, und: 40 },
    { name: 'i2', time: 2000, und: 30 },
    { name: 'i3', time: 1000, und: 20 }
  ]
};

const team2 = {

indongyoo

// Vanilla - Promise
function quarterfinal(teams) {
  return Promise
    .all(
      teams.map(team =>
        function skateAll(skaters, i = 0) {
          if (skaters.length == i) return;
          return skate(skaters[i]).then(_=> skateAll(skaters, i+1));
        } (team.skaters)
          .then(_=> console.log(`${team.name}팀 결승선 통과!`))

indongyoo

function numP(a) {
  return new Promise(function(resolve) {
    setTimeout(function() {
      resolve(a);
    }, 1000);
  });
}

const concurrency = mapC(a => a());
const series = map(a => a());

indongyoo

const add2 = a => Promise.resolve(a + 2);

(function() {
  const list = [1, 2, 3, 4];
  const result = list.map(async function(val) {
    return await add2(val);
  });
  console.log(result, 'async/await 1');
  // [Promise, Promise, Promise, Promise] async/await 1
}) ();

indongyoo

(async function() {
  const list = [1, 2, 3, 4];
  const result = await list.map(async function(val) {
    return await add2(val);
  });
  console.log(result, 'async/await 2');
  // [Promise, Promise, Promise, Promise] async/await 2
}) ();

indongyoo

(async function() {
  const list = [1, 2, 3, 4];
  const result = await map(async function(val) {
    return await add2(val);
  }, list);
  console.log(result, 'async/await 3');
  // [3, 4, 5, 6] async/await 3
}) ();