Find longest sequence of zeros in binary representation of an integer.

codility-sequence.js

// codility test prep questions
// For example, number 9 has binary representation 1001 and contains a binary gap of length 2. 
// The number 529 has binary representation 1000010001 and contains two binary gaps: one of length 
// 4 and one of length 3. The number 20 has binary representation 10100 and contains one binary gap of length 1. 
// The number 15 has binary representation 1111 and has no binary gaps. The number 32 has binary representation 
// 100000 and has no binary gaps.

function findFirstNumberOfZeroes(num){
    var binary = num.toString(2);
    var numberOfZeros = 0;
    var stopped = false;
    for(var i=1; i<binary.length;i++){
        var chr = binary[i]
        if(chr === '0'){
            numberOfZeros += 1;
        }
        if(chr == '1'){
            stopped = true
            break;
        }
    }
    return stopped ? numberOfZeros : 0;
}

findFirstNumberOfZeroes(15) // returns 0
findFirstNumberOfZeroes(20) // returns 1
findFirstNumberOfZeroes(529) // returns 4