Vérité

Par Franck, . Lien permanent Brèves

La vérité si je mens, Babel c’est bien ! Agade ce simple code en ES6 :

'use strict';
class Vehicle {
  constructor(brand) {
    this.brand = brand;
  }
}

class Car extends Vehicle {
  constructor(brand,model) {
    super(brand);
    this.model = model;
  }
}

let myCar = new Car('Mercedes','300SL');
console.log(myCar);

Converti en version 5 par Babel :

'use strict';

var _get = function get(_x, _x2, _x3) { var _again = true; _function: while (_again) { var object = _x, property = _x2, receiver = _x3; desc = parent = getter = undefined; _again = false; if (object === null) object = Function.prototype; var desc = Object.getOwnPropertyDescriptor(object, property); if (desc === undefined) { var parent = Object.getPrototypeOf(object); if (parent === null) { return undefined; } else { _x = parent; _x2 = property; _x3 = receiver; _again = true; continue _function; } } else if ('value' in desc) { return desc.value; } else { var getter = desc.get; if (getter === undefined) { return undefined; } return getter.call(receiver); } } };

function _inherits(subClass, superClass) { if (typeof superClass !== 'function' && superClass !== null) { throw new TypeError('Super expression must either be null or a function, not ' + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError('Cannot call a class as a function'); } }

var Vehicle = function Vehicle(brand) {
  _classCallCheck(this, Vehicle);

  this.brand = brand;
};

var Car = (function (_Vehicle) {
  _inherits(Car, _Vehicle);

  function Car(brand, model) {
    _classCallCheck(this, Car);

    _get(Object.getPrototypeOf(Car.prototype), 'constructor', this).call(this, 'Mercedes');
    this.model = model;
  }

  return Car;
})(Vehicle);

var myCar = new Car('Mercedes', '300SL');
console.log(myCar);

Y’a pas photo !

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