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On design patterns: When should I use the singleton?
The glorified global variable - becomes a gloried global class. Some say breaking object-oriented design.
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Using querySelector with IDs that are numbers
...r is numeric, you’ll need to escape it based on its Unicode code point. For example, the code point for the character 1 is U+0031, so you would escape it as \000031 or \31 .
Basically, to escape any numeric character, just prefix it with \3 and append a space character ( ). Yay Unicode!
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Controlling number of decimal digits in print output in R
There is an option in R to get control over digit display. For example:
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ValidateAntiForgeryToken purpose, explanation and example
Could you explain ValidateAntiForgeryToken purpose and show me example about ValidateAntiForgeryToken in MVC 4?
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Semicolons superfluous at the end of a line in shell scripts?
... end of a line are superfluous, since the newline is also a command separator. case specifically needs double semicolons at the end of the last command in each pattern block; see help case for details.
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How far can memory leaks go?
I've run into memory leaks many times. Usually when I'm malloc -ing like there's no tomorrow, or dangling FILE * s like dirty laundry. I generally assume (read: hope desperately) that all memory is cleaned up at least when the program terminates. Are there any situations where leaked memory won't ...
How to convert a string from uppercase to lowercase in Bash? [duplicate]
...LLO
y=${x,,}
echo $y # hello
z=${y^^}
echo $z # HELLO
Use only one , or ^ to make the first letter lowercase or uppercase.
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Position absolute and overflow hidden
...position: relative and inner <div> to position: absolute. It should work for you.
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Declare a const array
... const:
public static readonly string[] Titles = { "German", "Spanish", "Corrects", "Wrongs" };
The reason is that const can only be applied to a field whose value is known at compile-time. The array initializer you've shown is not a constant expression in C#, so it produces a compiler error.
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How to exit from PostgreSQL command line utility: psql
What command or short key can I use to exit the PostgreSQL command line utility psql ?
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