Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

JavaScript JavaScript Loops, Arrays and Objects Simplify Repetitive Tasks with Loops The Refactor Challenge, Part 2

Aditya Shah
PLUS
Aditya Shah
Courses Plus Student 776 Points

Course's code seems lengthy. Thoughts on my solution?

Here's my code: https://w.trhou.se/vpriwow7cd

It's in script.js.

It accomplishes the goal of the previous challenge in a slightly different way. Namely, I don't understand why it's helpful to create a function for rgbcolor instead of leaving it as it is (just 1 line of code). However, since I'm a beginner, I might be missing an important principle. Is it simply that creating functions is "cleaner" (or DRYer) than having repetition in even a single line of code?

I realize that I could use a random int generating function and simplify my code even further here.

4 Answers

Jennifer Nordell
seal-mask
STAFF
.a{fill-rule:evenodd;}techdegree
Jennifer Nordell
Treehouse Teacher

Hi there! The reason the rgbColor was moved out into its own function is so that it might be used in other places later on besides just that particular for loop. You could potentially want to use it to set the color of a font or some other element that isn't being manipulated inside that particular loop using the rgbColor. It's just allowing for your code to grow.

That being said, you're doing something here that is overly complicating the code and has no effect. Math.random() does not take any arguments.

function color(i) {
  return Math.floor(Math.random(i) * 256 );
}

You pass in a 1, then a 2, and then a 3, but this is entirely unnecessary. This could be simplified to

function color() {
  return Math.floor(Math.random() * 256 );
}

This would make the associated line to assign the rgbColor look like this:

rgbColor = 'rgb(' + color() + ',' + color() + ',' + color() + ')';

Hope this helps! :sparkles:

Dan Sally
PLUS
Dan Sally
Courses Plus Student 4,344 Points

I had a similar question, but my solution was a little different than Aditya's. Any comments on the code below?

  function color(){
  rgbcode = Math.floor(Math.random() * 256 );
  return rgbcode
}

var html = '';
var rgbColor;

for(i=0; i<10; i += 1){
  rgbColor = 'rgb(' + color() + ',' + color() + ',' + color() + ')';
  html += '<div style="background-color:' + rgbColor + '"></div>';
}

document.write(html);

Hey Dan! Your code works fine. Instead of creating the variable "rgbCode" you can return the result directly to color() and get the same result.

Doron Geyer
seal-mask
.a{fill-rule:evenodd;}techdegree
Doron Geyer
Full Stack JavaScript Techdegree Student 13,880 Points

as christofer said you can return without a variable, so the function itself would actually return the color. your code:

function color(){
  rgbcode = Math.floor(Math.random() * 256 );
  return rgbcode;
}
function color(){
  return  Math.floor(Math.random() * 256 );
}

also careful on the camelCase just for best practice.

rgbcode

should be

 rgbCode
Luqman Shah
Luqman Shah
3,016 Points

This part really confused me, I know we've already learned about functions, but we are already trying to understand the concept of loops, this was a bit too much information to swallow.

Hi all !! I was having a lot of fun with this challenge and came up with a way to solve it without using any functions

Have a look at the code!!

https://w.trhou.se/18e94uzb8w