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Why is the shovel operator (
... #=> 2154889340
a << 'bar'
a.object_id #=> 2154889340
a += 'quux'
a.object_id #=> 2154742560
So << alters the original string rather than creating a new one. The reason for this is that in ruby a += b is syntactic shorthand for a = a + b (the same goes for the other <op>...
HTTP POST using JSON in Java
... request
Create an HttpPost request with it and add the header application/x-www-form-urlencoded
Create a StringEntity that you will pass JSON to it
Execute the call
The code roughly looks like (you will still need to debug it and make it work):
// @Deprecated HttpClient httpClient = new DefaultHtt...
How do I check for C++11 support?
... at compile-time if the compiler supports certain features of C++11? For example, something like this:
8 Answers
...
How to use glOrtho() in OpenGL?
I can't understand the usage of glOrtho . Can someone explain what it is used for?
3 Answers
...
Can you grab or delete between parentheses in vi/vim?
...his works because % is a "motion command", so it can be used anywhere vim expects such a command. From :help y:
["x]y{motion} Yank {motion} text [into register x]. When no
characters are to be yanked (e.g., "y0" in column 1),
this is an error when 'cpo...
Arrow operator (->) usage in C
...he chapter on pointers and the -> (arrow) operator came up without explanation. I think that it is used to call members and functions (like the equivalent of the . (dot) operator, but for pointers instead of members). But I am not entirely sure.
...
System.BadImageFormatException: Could not load file or assembly (from installutil.exe)
I am trying to install a Windows service using InstallUtil.exe and am getting the error message
15 Answers
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Xcode 6 Bug: Unknown class in Interface Builder file
I upgraded to Xcode 6 beta 4 and now my App continuously crashes with the message
52 Answers
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Using app.configure in express
I found some code where they set up Express without using app.configure and I was wondering, what's the difference between using app.configure without an environment specifier and not using it?
...
How can I view all historical changes to a file in SVN
...ogentry/diff pairs. The first revision of the file is emitted as
# full text since there's not previous version to compare it to.
function history_of_file() {
url=$1 # current url of file
svn log -q $url | grep -E -e "^r[[:digit:]]+" -o | cut -c2- | sort -n | {
# first revision as f...