var h = 3;

console.log(g(h,function(x){
    function g(h,provider) {
        let value = "";
        (new Array(h)).fill(0).forEach(function(v,i){
            value+=provider(i+1)+"\n";
        });
        return value;
    }
    let f = [(new String(' ')).repeat(h-(x)), (new String('#')).repeat(x), ' ', (new String('#')).repeat(x)];
    return f.join('');
}));