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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>

<script id="jsbin-javascript">
/**
 * Реализовать RLE-сжатие: AAAB -> A3B, BCCDDDAXXXX -> BC2D3AX4
 * @param  {string} value
 * @return {string}
 */
function rle(value) {
    const result = [(value.length > 0 ? value[0] : '')];

    for(let i = 1; i <= value.length; i++) {
        if (result[result.length - 1] != value[i]) {
            if (i - result.length + 1 > 1) {
                result[result.length - 1] = result[result.length - 1] + (i - result.length + 1);
            }
            result[i] = value[i];
        }
    }

    return result.join('');
}

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

</script>


<script id="jsbin-source-javascript" type="text/javascript">/**
 * Реализовать RLE-сжатие: AAAB -> A3B, BCCDDDAXXXX -> BC2D3AX4
 * @param  {string} value
 * @return {string}
 */
function rle(value) {
    const result = [(value.length > 0 ? value[0] : '')];

    for(let i = 1; i <= value.length; i++) {
        if (result[result.length - 1] != value[i]) {
            if (i - result.length + 1 > 1) {
                result[result.length - 1] = result[result.length - 1] + (i - result.length + 1);
            }
            result[i] = value[i];
        }
    }

    return result.join('');
}

console.log(rle('AVVVBBBVVXDHJFFFFDDDDDDHAAAAJJJDDSLSSSDDDD'));
</script></body>
</html>