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What exactly is metaprogramming?
... object.
In languages like ActionScript, you can evaluate functions at runtime to create new programs such as eval("x" + i). DoSomething() would affect an object called x1 when i is 1 and x2 when i is 2.
Finally, another common form of metaprogramming is when the program can change itself in non-t...
Can you use a trailing comma in a JSON object?
...ason. Makes extra trailing commas much easier to spot, and saves a lot of time. It's annoying, I wish there were an option to throw an error for this with firefox (since that would help with debugging).
– rocketmonkeys
Aug 30 '11 at 18:16
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How to delete duplicate lines in a file without sorting it in Unix?
...ates to true. The ++ increments seen so that seen[$0] == 1 after the first time a line is found and then seen[$0] == 2, and so on.
Awk evaluates everything but 0 and "" (empty string) to true. If a duplicate line is placed in seen then !seen[$0] will evaluate to false and the line will not be writte...
How to split a string in Java
...mpiled in advance and stored as a static member (initialised at class load time in the example). The regular expression is:
(\d+)-(\d+)
The parentheses denote the capturing groups; the string that matched that part of the regexp can be accessed by the Match.group() method, as shown. The \d matche...
How do I install cygwin components from the command line?
... Since the original project is dead, I suggest looking at this (as of the time of this comment) active fork: github.com/kou1okada/apt-cyg
– Vladimir Panteleev
Aug 19 '17 at 17:37
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How to replace a character by a newline in Vim
...atim, and Ctrl-Q means that someone made the mistake of loading the $VIMRUNTIME/mswin.vim configuration file. You don't need mswin. Just use your own vimrc instead.
– 00dani
Oct 12 '16 at 4:28
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What is best tool to compare two SQL Server databases (schema and data)? [duplicate]
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I have had Visual Studio 2013 crash on me multiple times while trying to use the built-in tools to sync data from our Prod database to the Test database. It works good for small batches, but when you try to sync the entire database..... well, good luck. RedGate's tool has ...
How to convert a std::string to const char* or char*?
...super-set of .data()'s, you can always safely use .c_str(), but people sometimes don't because:
using .data() communicates to other programmers reading the source code that the data is not ASCIIZ (rather, you're using the string to store a block of data (which sometimes isn't even really textual))...
Why is “a” != “a” in C?
...ue, depending on your compiler, which may combine equal strings at compile time into one to save space.
When you're comparing two character values (which are not pointers), it is a numeric comparison. For example:
'a' == 'a' // always true
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Can git ignore a specific line?
...ividual lines (you may know that already), but you'd have to do that every time you commit. I think it would be better to have a config file per deployment target (you can version those), and some runtime parameter for however you are starting the server (like ./myserver --config=whatever.js).
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