Can anyone help me with the code ?

Question

I need to convert binary number to decimal without using built in functions, so I generated this code but Smith in the syntax or the logic is wrong.

var bin=[];
for(var i=0;i<bin.length;i++){
var a=Math.pow(bin[i],2);
document.write(a);
document.write("<br>");
}

var a=[];
var dec;
function b2d(a){

for(var j=a.length-1;j<a.length;j++){
dec+=j
}
return dec;
}
alert(b2d(a));

Answer 1

Both the bin array and the a array have a length of 0 when you are trying to do a comparison in your loops.