var lines;
var length = tiers;

function buildTriangle(tiers){
var triangle = "";

    for (var h = 1; h <= tiers; h++) {
    lines = function makeLine(length) {
    var line = "";
        for (var j = 1; j <= length; j++) {
        line += "* ";
        }
        return line + "\n";
    }
triangle += line + "\n";
return triangle;

}

}
console.log(buildTriangle (10));