[Algorithm] 20 week(5.30 ~ 6.5) 2/3

338. Counting Bits

var countBits = function(n) {
    const bits = [];
    
    for(let i = 0; i <= n; i++){
        bits.push(i.toString(2).split('').filter((bit) => bit === '1').length);
    };
    
    return bits
};