function ScaleBalancing(strArr) {
    const w1 = JSON.parse(strArr[0])[0];
    const w2 = JSON.parse(strArr[0])[1];
    let weights = JSON.parse(strArr[1]);
    for (let i = 0; i < weights.length; i++) {
        if (w1 + weights[i] === w2 || w2 + weights[i] === w1) {
            return '' + weights[i]; // should return 5 and break out of function right?
        }
        //if this for loop is omitted the function returns 5
        for (let j = i + 1; j < weights.length; j++) {
            if (w1 + weights[i] + weights[j] === w2 ||
                w2 + weights[i] + weights[j] === w1 ||
                w1 + weights[i] === w2 + weights[j] ||
                w2 + weights[i] === w1 + weights[j]) {
                return '' + weights[i] + ',' + weights[j]; //this returns 1,6
            }
        }
    }
    return 'not possible';
}
// keep this function call here
ScaleBalancing(["[6, 1]", "[1, 10, 6, 5]"]);