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Regex to match a digit two or four times
...igits, and optionally two more
(?:\d{2}){1,2} <-- two digits, times one or two
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When to add what indexes in a table in Rails
...d "index" to the automatically created "id" column?
No, this is already done by rails
Should I add "index(unique)" to the automatically created "id" column?
No, same as above
If I add index to two foreign keys at once (add_index (:users, [:category_id, :state_id]), what happens? How is t...
Set custom HTML5 required field validation message
I have one form with many input fields. I have put html5 validations
11 Answers
11
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Is JavaScript an untyped language?
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So the problem is that there's a few different definitions of untyped.
One definition has been talked about in one of the above answers - the runtime doesn't tag values and just treats each value as bits. JavaScript does tag values and has different behaviour based on those tags. So JavaScript o...
How do I get a substring of a string in Python?
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Just for completeness as nobody else has mentioned it. The third parameter to an array slice is a step. So reversing a string is as simple as:
some_string[::-1]
Or selecting alternate characters would be:
"H-e-l-l-o- -W-o-r-l-d"[::2] # outputs "Hello World"
The a...
Why is subtracting these two times (in 1927) giving a strange result?
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It's a time zone change on December 31st in Shanghai.
See this page for details of 1927 in Shanghai. Basically at midnight at the end of 1927, the clocks went back 5 minutes and 52 seconds. So "1927-12-31 23:54:08" actually happened twic...
AngularJS Directive Restrict A vs E
... attribute versus an element? Use an element when
you are creating a component that is in control of the template. The
common case for this is when you are creating a Domain-Specific
Language for parts of your template. Use an attribute when you are
decorating an existing element with new fu...
Best dynamic JavaScript/JQuery Grid [closed]
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@Somnath - Is jQuery grid the one you were most happy with? I have a similar need, and have been evaluating DataTables, but adding rows (and having them be part of the sort order) is not working well.
– MattW
Jan 12...
Why have header files and .cpp files? [closed]
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C++ compilation
A compilation in C++ is done in 2 major phases:
The first is the compilation of "source" text files into binary "object" files: The CPP file is the compiled file and is compiled without any knowledge about the other CPP files (or even libraries), u...
How To: Execute command line in C#, get STD OUT results
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There one other parameter I found useful, which I use to eliminate the process window
pProcess.StartInfo.CreateNoWindow = true;
this helps to hide the black console window from user completely, if that is what you desire.
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