rle-js-rubaxa

/**
 * Реализовать RLE-сжатие: AAAB -> A3B, BCCDDDAXXXX -> BC2D3AX4
 * @param  {string} value
 * @return {string}
 */
function rle(value) {
    if (!value) return '';
    if (typeof value !== 'string') throw 'Give me your ̶m̶o̶n̶e̶y string!';

    let res = value[0];
    let currCharCount = 1;

    for (var i = 1; i < value.length; i++) {
        if (res.endsWith(value[i])) {
            currCharCount += 1;
        } else {
            if (currCharCount !== 1) {
                res += currCharCount.toString();
            }
            res += value[i];
            currCharCount = 1;
        }
    }

    if (currCharCount !== 1) {
        res += currCharCount.toString();
    }

    return res;
}


console.log(rle('AVVVBBBVVXDHJFFFFDDDDDDHAAAAJJJDDSLSSSDDDD'));
console.log(rle('11333355555577777777'));