five fun JavaScript questions

[Peter Michaux]

Maybe you want a job with Meebo? You have to pass the test first...

<URL:http://blog.meebo.com/?page_id=254>

I enjoyed these questions. Any other nice little JavaScript quizzes
out there?

Peter

 

[-Lost]

Maybe you want a job with Meebo? You have to pass the test first...

<URL:http://blog.meebo.com/?page_id=254>

I enjoyed these questions. Any other nice little JavaScript quizzes
out there?

I didn't check any of these, but remember taking the W3Schools.com quiz
when I first started dabbling in JavaScript a few months back.

It was rather rudimentary, and some of the answers are not entirely
accurate. Like, "What is the best way to create an array?"

http://en.allexperts.com/q/Javascript-1520/javascript-exam.htm

 

[dd]

I didn't check any of these, but remember taking the W3Schools.com quiz
when I first started dabbling in JavaScript a few months back.

It was rather rudimentary, and some of the answers are not entirely
accurate. Like, "What is the best way to create an array?"

Not quite the wording they use in that w3schools test. They
don't say "best", but they do show 4 examples, only one of
which works. What I found more objectionable was question
12 where they show this as "the correct" for loop construct:

for ( i=0; i<something; i++ )

Right away teaching people to create globals when they meant
to use a local variable. That would make my top 10 of most
commonly made JavaScript mistakes.

Maybe we should have a FAQ entry that shows such a top 10.
I'd put the lack of defensive coding as #1 with these two
examples showing the same problem (not checking if the
object you're about to perform an operation on actually exists):

var mywin=window.open(<<the window params>>);
mywin.some_operation(); //fails if window popup was blocked

or

var myobj=document.getElementById("my_obj_id");
myobj.some_operation(); //fails if that element doesn't exist

The number of times I get asked if I want to debug on live sites
in IE because of these two problems, it's tedious to say the least.

How about it FAQ dudes? A most common mistakes FAQ ?

 

[Matt Kruse]

How about it FAQ dudes? A most common mistakes FAQ ?

I've long intended to include such a section in my Best Practices
document, which is similar:
http://www.JavascriptToolbox.com/bestpractices/

But I haven't gotten around to it yet

Matt Kruse

 

[-Lost]

dd said the following on 4/26/2007 2:00 AM:

That is beyond the scope of newbie classes (although scope should be one
of the first things taught but you can't teach scope until you know some
scripting).

That would make my top 10 of most

#19 is worse:

19. How do you put a message in the browser's status bar?

status("put your message here")
window.status("put your message here")
window.status = "put your message here"
statusbar = "put your message here"

The correct answer? You don't.

Never have cared for any of the tutorials on w3schools site.


That is directly covered in the FAQ though. Although it is very very
obtuse to get to it.


#1: Attempting to close a window you didn't open.

Next?
Maybe not the FAQ, but a Notes page, or, even on Matt's page.

Would accessing preexisting collections by alternate DOM methods be a
common mistake?

It does not seem to be a mistake, but rather, a best practice kind of
thing (i.e. Matt's page addition).

Or better yet, maybe just say "getElementById() is not the best method
of accessing FORMs, see <URL
http://www.jibbering.com/faq/faq_notes/form_access.html#faEff>."

 

[G-Rod]

Dunno if you fixed it, but it was working for me in Firefox 2.0.0.3