Polyfill of 「bind」

[PolluxLee]

Polyfill

Function.prototype.bind2 = function (ctx) {
  var fn = this;
  var context = ctx;
  var args = Array.prototype.slice.call(arguments, 1);

  return function () {
    var bindArgs = Array.prototype.slice.call(arguments);
    return fn.apply(context, args.concat(bindArgs));
  }
}

ES6

Function.prototype.bind2 = function (ctx, ...args1) {
  var fn = this;
  var context = ctx;
  var a = args1;

  return function (...args2) {
    return fn.apply(context, args1.concat(args2));
  }
}

Test

var obj = {
  name: "April"
}

function getInfo(age, sex) {
  return {
    name: this.name,
    age,
    sex
  }
}

var a = getInfo.bind2(obj, 21, 'girl')();