Binary to Num conversion

https://www.hackerrank.com/challenges/30-binary-numbers/tutorial

by bob m

HTML

<p id="bin">what's new</p>

JavaScript

function toNumber(binStr){
	for (i=0; i < binStr.length; i++){  }
	return 0;
}
function toBinary(num){
	var remain= 0; var n = num; var binAry=[];
  while (n > 0){
  	remain = n % 2;
    n = Math.floor(n / 2);
    binAry.push(remain);
  }
  console.log(binAry);
  var test = '';
  var binResult= binAry.join('');		//.padStart(8,'0')
  do (i=binAry.length-1; i > 0 ; i++){
  	  //binResult = binAry.pop();	
      test += binAry[i];
  }
  return binResult;
}
var n = 4;
var bin= '00000101';
var res1 = toBinary(n);
var res2 = toNumber(bin);
console.log( res1 );
document.getElementById("bin").innerHTML = 'Binary is ' + res1 ;