beginner functions in JavaScript

gistfile1.js

//this function finds the absolute value of a number

function absolute(num) {
    if (num < 0) {
        return -num;
    } else {
        return num;
    }
}

console.log(absolute(-10));

Extra function: 

//this function iterates over every element in the array heaven, searches for elements that start with the letter b, and returns a string with all those elements.

var heaven = [34, [], "bodacious", "barbecues", "begin", "whatever", "by", "battering", true, "bacon"];
var bStuff = "";

for (var i = 0; i < heaven.length; i++) {
  if (heaven[i][0] == "b") {
    bStuff += heaven[i] + " ";
  }
}
console.log(bStuff);