[ES6] Bind generator without context.

bind.gen.without.ctx.js

/**
 * Bind generator with context preserved.
 * @param  {Generator} fn The generator
 * @return {Generator}    Generator with arguments bind.
 */
var _bind = function (fn) {
	var args = [].slice.call(arguments, 1);
	return function * () {
		var ir = fn.apply (this, args.concat.apply(args, arguments));
		var n;
		while (!(next = ir.next()).done)
			yield n.value;
	};
}

bindAlt.js

// Or, can be used as extension to Function Prototype:
(function (Generator) {
	Function.prototype.bindAlt = function () {
		var fn = this;
		var args = [].slice.call(arguments);

		return fn instanceof Generator ? function * () {
			var next, ir = fn.apply (this, args.concat.apply(args, arguments));
			while (!(next = ir.next()).done)
				yield next.value;
		} : function () {
			return fn.apply (this, args.concat.apply(args, arguments));
		};
	};

})((function*(){}).constructor);