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| // Experiment: I’m not sure if I would use this myself. | |
| //Just added a comment for practice | |
| const call = Symbol('call'); | |
| class Callable { | |
| constructor() { | |
| // Can’t use .bind() here. Not sure why. Maybe the result doesn’t | |
| // interact well with Object.setPrototypeOf(). | |
| const _this = (...args) => new.target.prototype[call].call(_this, ...args); | |
| Object.setPrototypeOf(_this, new.target.prototype); | |
| return _this; | |
| } | |
| } | |
| class Frobnicator extends Callable { | |
| constructor(x, y) { | |
| super(); | |
| this.x = x; | |
| this.y = y; | |
| } | |
| [call](z) { | |
| return z * this._product; | |
| } | |
| // Can’t use private slots (which can only be accessed via original instance) | |
| get _product() { | |
| return this.x * this.y; | |
| } | |
| } | |
| const ten = new Frobnicator(2, 5); | |
| console.log(ten(3), "thirty"); |
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