How to convert binary fraction to decimal

Question

Javascript has the function parseInt() which can help convert integer in a binary form into its decimal equivalent:

parseInt(\"101\", 2) // 5
         


        

Answer 1

But I'm wondering whether there is anything standard already.

No according my knowledge

I think you need to create your own function:

  function toDecimal(string, radix) {
    radix = radix || 2;
    var s = string.split('.');
    var decimal = parseInt(s[0], radix);

    if(s.length > 1){
       var fract = s[1].split('');

       for(var i = 0, div = radix; i < fract.length; i++, div = div * radix) {
          decimal = decimal + fract[i] / div;
       }
    }
    return decimal;
  }