binary gap solution

binaryGap.js

function solution(N) {
    // write your code in JavaScript (Node.js 8.9.4)
    let binaryGaps =  (N).toString(2); // returns binary string
    binaryGaps = binaryGaps.replace(/^0*/,''); // remove leading zeros (no gap)
    binaryGaps = binaryGaps.replace(/(0*$)/, ''); // remove trailing zeros (no gap)
    binaryGaps = binaryGaps.split(1); // split on 1 to get gaps
    const longestGap = Math.max(...(binaryGaps.map(gap => gap.length))); // get maximum number
    return longestGap;
}