alert("Note: If it gives error then your device does not support new JavaScript version. In that case, view this code from an updated browser or update your Android System Webview.") window.onload=function(){document.documentElement.style.minHeight=innerHeight+"px" var goAhead=setInterval(styleBg,100) } var angle=135 var questions=["alert(~String.prototype.constructor.constructor.name);","alert(Object.prototype.toString.call([]).match(/[A-Z]\\w*/));",`function pipe(...arg){ let len=arg.length; let val=arg[0]; for(let i=1;ix[0],alert); `,`var x; x++; document.write(x==x);`,`function Magic(){ var x=0; this.valueOf=function(){ return ++x; } }; var hello= new Magic(); document.write(+((hello+1)==(hello+0))); document.write(+(hello==hello)); document.write(+((hello+0)==(hello+1))); document.write(+((hello+1)==(hello+1)));`,`var a=5; alert((a++, 5, 10, a--, a*=2, a-=a, ++a, 2));`,`(function (num){ return this["alert"](this["Math"]["floor"]["name"]); })(5.5);`,`x=!function(){document.write("hello")}(); document.write((++x).toString(2));` ] var quesNo=1 var score=0 var answers=['-1','Array','N',"false","1100","2","floor","hello10"] function start(){ document.getElementById("starter").style.top="-500vh" document.getElementById("challenge").style.top="0" letsgo() } function back(){ quesNo=1; score=0; document.getElementById("gameover").style.top="-500vh"; document.getElementById('starter').style.top="0" } function letsgo(){ var q=document.getElementById("question") var inp=document.getElementById("ans") q.innerHTML="Question no "+quesNo+"
What is the output of this code?

"+questions[quesNo-1].split("<").join("<").split("\n").join("
").split(" ").join(" ") }; function chkans(val){ if(answers[quesNo-1]==val){ alert("Correct") score++ }else{ alert("Wrong") } if(questions[quesNo]){ quesNo++ letsgo() }else{ alert("No more questions. I shall add more soon.") document.getElementById("challenge").style.top="-500vh" document.getElementById("g").innerHTML=`Your final score is ${score}.
` document.getElementById("gameover").style.top="0" } } function styleBg(){ document.body.style.background=`linear-gradient(${angle}deg,#ff6622, #6622ff)` angle++ angle=angle%360 }

Ultimate JavaScript Challenge