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JavaScript style for optional callbacks
I have some functions which occasionally (not always) will receive a callback and run it. Is checking if the callback is defined/function a good style or is there a better way?
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Which is better, return value or out parameter?
...ery rare exception to this rule.)
Aside from anything else, it stops the caller from having to declare the variable separately:
int foo;
GetValue(out foo);
vs
int foo = GetValue();
Out values also prevent method chaining like this:
Console.WriteLine(GetValue().ToString("g"));
(Indeed, that...
When to use window.opener / window.parent / window.top
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window.opener refers to the window that called window.open( ... ) to open the window from which it's called
window.parent refers to the parent of a window in a <frame> or <iframe>
window.top refers to the top-most window from a window nested in one or mo...
socket.io and session?
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Edit: After trying some modules that didn't work, I've actually gone and written my own library to do this. Shameless plug: go check it out at https://github.com/aviddiviner/Socket.IO-sessions. I'll leave my old post below for historical purposes:
I got this work quite neatly with...
How do I escape the wildcard/asterisk character in bash?
...From the bash manual quote removal is:
After the preceding expansions, all
unquoted occurrences of the characters
‘\’, ‘'’, and ‘"’ that did not result
from one of the above expansions are
removed.
So what happens is when you type the command directly into the command line,...
How to convert a private key to an RSA private key?
...nk you! I was getting A client error (MalformedCertificate) occurred when calling the UploadServerCertificate operation: Unable to parse certificate. Please ensure the certificate is in PEM format. and running this on my private key fixed it!
– philfreo
Jun 19 ...
An invalid form control with name='' is not focusable
...ubmission (see Safari). The next developer or user with a browser that actually prevents form submission on clientside errors (see Chrome; even on hidden form elements) runs into the problem of an inaccessible form as one can't submit the form and doesn't get any message from the browser or site. Pr...
git: How to diff changed files versus previous versions after a pull?
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There are all kinds of wonderful ways to specify commits - see the specifying revisions section of man git-rev-parse for more details. In this case, you probably want:
git diff HEAD@{1}
The @{1} means "the previous position of the r...
How should I copy Strings in Java?
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@GriffeyDog: I am reading the question less literally. What I am saying is that it is safe to give out references to a string object without fear that someone might modify the string.
– NPE
May 15 '12 at 20:12
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Purpose of asterisk before a CSS property
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All browsers but IE ignore the rules. It's known as the star hack. I think IE7 will ignore the rules in standards mode.
In this case, the font rule is set and then overridden for IE 6 and sometimes 7.
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