es6/es5 async/await Promise (v2)

function promiseAdd (a, b) {
  return new Promise((resolve, reject) => {
    const res = a + b
    resolve(res)
  })
}
async function run () {
	let res
	promiseAdd(1,2).then((r)=>{
  		res = r
	})
}
run()

async function asyncAdd (a, b) {
  const res = a + b
  return res
}
async function run () {
	let res = await asyncAdd(1, 2)
}
run()

"use strict";

function asyncGeneratorStep(gen, resolve, reject, _next, _throw, key, arg) { try { var info = gen[key](arg); var value = info.value; } catch (error) { reject(error); return; } if (info.done) { resolve(value); } else { Promise.resolve(value).then(_next, _throw); } }

function _asyncToGenerator(fn) { return function () { var self = this, args = arguments; return new Promise(function (resolve, reject) { var gen = fn.apply(self, args); function _next(value) { asyncGeneratorStep(gen, resolve, reject, _next, _throw, "next", value); } function _throw(err) { asyncGeneratorStep(gen, resolve, reject, _next, _throw, "throw", err); } _next(undefined); }); }; }

function promiseAdd(a, b) {
  return new Promise(function (resolve, reject) {
    var res = a + b;
    resolve(res);
  });
}

function run() {
  return _run.apply(this, arguments);
}

function _run() {
  _run = _asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee() {
    var res;
    return regeneratorRuntime.wrap(function _callee$(_context) {
      while (1) {
        switch (_context.prev = _context.next) {
          case 0:
            promiseAdd(1, 2).then(function (r) {
              res = r;
            });

          case 1:
          case "end":
            return _context.stop();
        }
      }
    }, _callee);
  }));
  return _run.apply(this, arguments);
}

run();

"use strict";

function asyncGeneratorStep(gen, resolve, reject, _next, _throw, key, arg) { try { var info = gen[key](arg); var value = info.value; } catch (error) { reject(error); return; } if (info.done) { resolve(value); } else { Promise.resolve(value).then(_next, _throw); } }

function _asyncToGenerator(fn) { return function () { var self = this, args = arguments; return new Promise(function (resolve, reject) { var gen = fn.apply(self, args); function _next(value) { asyncGeneratorStep(gen, resolve, reject, _next, _throw, "next", value); } function _throw(err) { asyncGeneratorStep(gen, resolve, reject, _next, _throw, "throw", err); } _next(undefined); }); }; }

function asyncAdd(_x, _x2) {
  return _asyncAdd.apply(this, arguments);
}

function _asyncAdd() {
  _asyncAdd = _asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee(a, b) {
    var res;
    return regeneratorRuntime.wrap(function _callee$(_context) {
      while (1) {
        switch (_context.prev = _context.next) {
          case 0:
            res = a + b;
            return _context.abrupt("return", res);

          case 2:
          case "end":
            return _context.stop();
        }
      }
    }, _callee);
  }));
  return _asyncAdd.apply(this, arguments);
}

function run() {
  return _run.apply(this, arguments);
}

function _run() {
  _run = _asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee2() {
    var res;
    return regeneratorRuntime.wrap(function _callee2$(_context2) {
      while (1) {
        switch (_context2.prev = _context2.next) {
          case 0:
            _context2.next = 2;
            return asyncAdd(1, 2);

          case 2:
            res = _context2.sent;

          case 3:
          case "end":
            return _context2.stop();
        }
      }
    }, _callee2);
  }));
  return _run.apply(this, arguments);
}

run();