Building a triangle

/*
 * Programming Quiz: Build A Triangle (5-3)
 */

// creates a line of * for a given length
function makeLine(length) {
    var line = "";
    for (var j = 1; j <= length; j++) {
        line += "* ";
    }
    return line + "\n";
}

// your code goes here.  Make sure you call makeLine() in your own code.

function buildTriangle(num){
    let output = "";
    for (let x = 1; x <= num; x++ ) {
        output += makeLine(x);
    }
    return output;
}

console.log(buildTriangle(10));