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What does the construct x = x || y mean?
...o if you call the method with no arguments it will use a default value of "Error".
It's shorthand for writing:
if (!title) {
title = "Error";
}
This kind of shorthand trick with boolean expressions is common in Perl too. With the expression:
a OR b
it evaluates to true if either a or b is t...
How to debug an apache virtual host configuration?
...
Syntax check
To check configuration files for syntax errors:
# Red Hat-based (Fedora, CentOS) and OSX
httpd -t
# Debian-based (Ubuntu)
apache2ctl -t
# MacOS
apachectl -t
List virtual hosts
To list all virtual hosts, and their locations:
# Red Hat-based (Fedora, CentOS) and O...
The OutputPath property is not set for this project
...le my project from x86 debug mode in Visual Studio 2008. I am getting this error. When I looked at the property group of the project that complained, I see output path is set.
...
Stop and Start a service via batch or cmd file?
How can I script a bat or cmd to stop and start a service reliably with error checking (or let me know that it wasn't successful for whatever reason)?
...
rsync error: failed to set times on “/foo/bar”: Operation not permitted
I'm getting a confusing error from rsync and the initial things I'm finding from web searches (as well as all the usual chmod'ing) are not solving it:
...
Command not found error in Bash variable assignment
... If you have a variable with a name that contaings "-", the same error happens. In that case, the solution is to remove the "-"
– chomp
Jun 17 '16 at 2:27
1
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Python: try statement in a single line
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Some people abuse the short-circuiting behavior of or to do this. This is error prone, so I never use it.
c = None
b = [1, 2]
a = c or b
Consider the following case:
c = []
b = [1, 2]
a = c or b
In this case, a probably should be [], but it is [1, 2] because [] is false in a boolean context. ...
Swift compiler error: “non-modular header inside framework module”
...I would like to migrate my ObjC framework to Swift and I got the following error:
20 Answers
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Strange SQLAlchemy error message: TypeError: 'dict' object does not support indexing
...
I wish they would of updated that error message, every time I get it I end up landing on this page and answer
– oshi2016
Mar 16 '17 at 5:46
...
Call An Asynchronous Javascript Function Synchronously
...y rejects you can wrap it in a try catch or skip the try catch and let the error propagate to the async/await functions catch call. You should be careful not to leave promise errors unhandled especially in Node.js. Below are some examples that show off how errors work.
function timeoutReject (t...