BJ_web_developers / dyitoc

  "use strict";
  
  module.exports = function () {
  	var arr = [1, 2, 3, 4, 5, 6];
  	if (typeof arr.fill !== "function") return false;
  	return String(arr.fill(-1, -3)) === "1,2,3,-1,-1,-1";
  };