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How to get number of entries in a Lua table?
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I got the impression from the comments that the proxytable/metamethods thing doesn't fully support this scenario yet, so I'll accept this as the best way currently available.
– Roman Starkov
Apr 27 '10 at 10...
Dealing with multiple Python versions and PIP?
... Got Could not find a version that satisfies the requirement pip (from versions: ) No matching distribution found for pip when I tried python2.6 get-pip.py
– Pyderman
Jan 14 '16 at 18:48
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How to change a nullable column to not nullable in a Rails migration?
...ecause (2) the migration has no way of knowing what the column was changed from in a potential revert. So for this case I would stick with up and down.
– DanneManne
Aug 30 '12 at 4:03
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What is the 'instanceof' operator used for in Java?
...ide.
Think about it this way. Say all the houses on your block were built from the same blueprints. Ten houses (objects), one set of blueprints (class definition).
instanceof is a useful tool when you've got a collection of objects and you're not sure what they are. Let's say you've got a collecti...
Passing data to a closure in Laravel 4
...>junior->last_name );
$m->subject('Monthly Report');
$m->from('info@website.com', 'Sender');
});
Note: The function being used is a PHP Closure (anonymous function) It is not exclusive to Laravel.
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How do you access command line arguments in Swift?
...Begin by declaring a type that defines the information you need to collect from the command line. Decorate each stored property with one of ArgumentParser's property wrappers, and declare conformance to ParsableCommand.
The ArgumentParser library parses the command-line arguments, instantiates your ...
Unit testing that events are raised in C# (in order)
...hen the above won't work, unless I'm missing something. I've recently come from C++ to C#.
– codah
Oct 23 '17 at 21:43
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Keyboard shortcuts in WPF
...hould take a look on Commands and Input gestures. Here is a small tutorial from Switch on the Code: WPF Tutorial - Command Bindings and Custom Commands
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How to get the first non-null value in Java?
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Following on from LES2's answer, you can eliminate some repetition in the efficient version, by calling the overloaded function:
public static <T> T coalesce(T a, T b) {
return a != null ? a : b;
}
public static <T> T coa...
html tables: thead vs th
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As far as I can tell from experience, there is no difference in rendering unless you're using CSS to specify a difference in rendering. A <td> inside of a <thead> will render the same as a <th> inside of a <table> or a <...