SOURCE

Function.prototype.mybind = function (context) {
	let self = this,
		args = Array.prototype.slice.call(arguments, 1),
		fBound = function () {
			let bindArgs = Array.prototype.slice.call(arguments)
			return self.apply(this instanceof fBound ? this : context, args.concat(bindArgs))
		}
	if (this.prototype) {
		fBound.prototype = Object.create(this.prototype)
	}
	return fBound
}