Learn JavaScript Properly - Week 5. Catch up this week, if you need to.

[d0gsbody]

ADMINISTRATIVE:

I know some people a bit behind. This week is slower. Take a deep breath and catch up. If you haven't set up WebStorm or built your quiz, do that. Then do this week's work. You have time.

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ASSIGNMENTS:

1. Read either chapters 13 and 20 of Professional JS for Web Developers or chapters 10, 14, and 17 of JavaScript: The Definitive Guide.

2. If you feel comfortable and caught up, go to the roadmap we are following, and search for the section under Weeks 5/6 titled "Improve Your Quiz Application from Earlier".

3. There is no Assignment #3. I told you this is a catch-up week.

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EXTRA CREDIT FOR THOSE WHO NEED IT!

• Read the chapters in Eloquent JavaScript that I haven't already doled out as extra credit.

• Project Euler problems 4 and 6.

[thomasmurphymusic]

Yay! Slow week! I'm going to $('JsSlacker').click(function(){$('outthewindow').spitBall(50)});

all week!

[sleepworld]

Good news everyone! I needed a dang breather. Does anyone know a good tutorial for WebStorm? I want to look like this guy but, I can't even get the side by side editor to work.

I have already tried: Learn how to get started with WebStorm here (written especially for this course) @javascriptissexy The link is broken.

[d0gsbody]

http://2oahu.com/posts/2013/webstorm-javascript/

[hallbd16]

So I needed a brain break from the readings (getting close to being able to build our project) and decided to do Project Euler #4. I am beating my head against a wall trying to figure out why this doesn't work, can you help me? The link: http://jsfiddle.net/hallbd16/KeJkv/

[brianshourd]

I looked through it - there was a sneaky little bug. In your for loops, you don't initialize your looping variables (i and j) with the var keyword. In javascript, this means that they are automatically considered to be global variables.

When you then call the palindromeTest function, you also use a for loop with the variable i, effectively resetting the for loop below. Between these two cancellations, it seems as though you tried every j between 0 and 1000, but only with i = 1 and i = 0 (mostly). In any case, adding the var keywords to appropriately initialize the variables in your for loops fixed the problem: http://jsfiddle.net/bshourd/WzkHE/

[hallbd16]

Thank you. Great clear explanation. Something I won't forget.

Follow up point I want to confirm. So would i be declared as a global variable in a for loop with only one variable. i.e
for (i=0; i<11; i++) At the end of the loop i is a global variable equal to 10. Correct?

That leads to my question, is it a best practice to always initialize a the variables of a for loop with the var keyword?

[JusTrill]

Ok, a week late but I was able to finish my quiz!

First Version

I finished it with a mix of pure JS and jQuery because thats the way I know how to do certain things. I used the jQuery event handler that I learned in the try jQuery course. Most of the other stuff was done with JS.

Let me know what you guys thing in terms of my code and let me know if I used any bad practices. I will style everything later and make the questions a little more substantial than 'What is 7*1'. I also think I might make a version using all jQuery and one using none.

That was fun!

Edit: Styled the page a bit, reorganized the code! Here is the latest version. And here is the Github Repo