AMN.js

AMN.js

function combine(a) {
    var fn = function(n, src, got, all) {
        if (n == 0) {
            if (got.length > 0) {
                all[all.length] = got;
            }
            return;
        }
        for (var j = 0; j < src.length; j++) {
            fn(n - 1, src.slice(j + 1), got.concat([src[j]]), all);
        }
    };
    var all = [];
    for (var i = 0; i < a.length; i++) {
        fn(i, a, [], all);
    }
    all.push(a);
    return all;
}

function AMN(A, M, N) {
    return combine(A).filter((arr) => {
        if (arr.length === M) {
            var sum = arr.reduce((p, v) => {
                return p + v;
            });
            return sum === N;
        }
        return false;
    });
}

console.log(AMN([1, 2, 3, 4, 5, 6, 7, 8], 3, 10));