Exception handling in ES6 - Transpiled to ES5

exception-handling-in-es6.es5.js

// transpiled to ES5

'use strict';

var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };

function _asyncToGenerator(fn) { return function () { var gen = fn.apply(this, arguments); return new Promise(function (resolve, reject) { function step(key, arg) { try { var info = gen[key](arg); var value = info.value; } catch (error) { reject(error); return; } if (info.done) { resolve(value); } else { return Promise.resolve(value).then(function (value) { step("next", value); }, function (err) { step("throw", err); }); } } return step("next"); }); }; }

var someAsyncOperation = function () {
  var _ref = _asyncToGenerator(regeneratorRuntime.mark(function _callee(path) {
    return regeneratorRuntime.wrap(function _callee$(_context) {
      while (1) {
        switch (_context.prev = _context.next) {
          case 0:
            return _context.abrupt('return', new Promise(function (resolve, reject) {
              setTimeout(function () {
                if (typeof path === 'string') {
                  resolve('Hello Panda! Path is = ' + path);
                } else {
                  reject(new Error('Path is not a string. Path (' + (typeof path === 'undefined' ? 'undefined' : _typeof(path)) + ') = ' + path));
                }
              }, 1000);
            }));

          case 1:
          case 'end':
            return _context.stop();
        }
      }
    }, _callee, undefined);
  }));

  return function someAsyncOperation(_x) {
    return _ref.apply(this, arguments);
  };
}();

// the ES6 way
_asyncToGenerator(regeneratorRuntime.mark(function _callee2() {
  var res;
  return regeneratorRuntime.wrap(function _callee2$(_context2) {
    while (1) {
      switch (_context2.prev = _context2.next) {
        case 0:
          _context2.prev = 0;
          _context2.next = 3;
          return someAsyncOperation(321);

        case 3:
          res = _context2.sent;

          console.log(res);
          _context2.next = 10;
          break;

        case 7:
          _context2.prev = 7;
          _context2.t0 = _context2['catch'](0);

          console.error('(FROM ASYNC/AWAIT) Error cause is:', _context2.t0);

        case 10:
        case 'end':
          return _context2.stop();
      }
    }
  }, _callee2, undefined, [[0, 7]]);
}))();

// the promise way
(function () {
  someAsyncOperation(123).then(function (res) {
    console.log(res);
  }).catch(function (error) {
    console.error('(FROM PROMISE) Error cause is:', error);
  });
})();