ES6 Functors

functor.js

class Functor {
  constructor(...args) {
    var self = this;
    
    if (typeof this.constructor._functorlock === 'undefined') {
      this.constructor._functorlock = true;
      return ((functorClass) => {
        var inst = new self.constructor(...args);
        var out = inst.call.bind(inst);
        for (let i of (Object.getOwnPropertyNames(inst).concat(Object.getOwnPropertyNames(Object.getPrototypeOf(inst))))) {
          if (typeof inst[i] === "function") {
            out[i] = inst[i].bind(inst);
          } else {
            out[i] = inst[i];
          }
        }
       
        delete out.call;
        
        delete self.constructor._functorlock;
       
        return out;
      })(this.constructor);
    }
  }
}
 
class func extends Functor {
  constructor(arg) {
    super(...arguments);
    this.a = arg
  }
  call() {
    console.log(this.a)
  }
  otherfunc() {
    console.log('hi')
  }
};
 
let inst = new func('byee');
 
let l = console.log;
 
inst();
inst.otherfunc();