You probably know about Function.prototype.bind method in JavaScript. It returns a copy of the original function but this function will always be called in the specified context. The problem is that you can't rebind another context any more. var func = function () { return this.prop; }; var obj1 = {prop: 1}, obj2 = {prop: 2}; func = func.bind(obj1); func(); // Will produce 1 func = func.bind(obj2); func(); // Will also produce 1 :( Your task is override the native Function.prototype.bind method by a new one that will allow you to rebind context multiple times. In this kata you don't need to worry about currying, testing function will never get params. Node version 8

Function.prototype.bind = function () {
        const fn = this,
        [context, ...args] = [...arguments];
        return function () {
          return fn.call(context, ...args);
        }
      }
    
      const obj = {
        name: 'Inigo Montoya',
      };
    
      const func = function (greeting) {
        return `${greeting}, my name is ${this.name}`;
      };
    
      const boundFunc = func.bind(obj);
      boundFunc('greetings'); // "greetings, my name is Inigo Montoya"
    
      boundFunc.bind({name: 'Michael'})('greetings'); // "greetings, my name is Michael"