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Why does appending “” to a String save memory?
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That's one of the very few cases where the String(String) constructor (i.e. the String constructor taking a String as input) is useful: new String(data.substring(x, y)) does effectively the same thing as appending "", but it makes t...
Remove NA values from a vector
...ilt-in solution among the function's arguments. I've found there's usually one already there.
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Use of #pragma in C
...pragmatic for the current context rather than ideologically dogmatic.
The one I regularly use is #pragma pack(1) where I'm trying to squeeze more out of my memory space on embedded solutions, with arrays of structures that would otherwise end up with 8 byte alignment.
Pity we don't have a #dogma y...
List comprehension in Ruby
...pal conception of list comprehension involves creating an array/list where one didn't exist before by referencing some iteration. But actually, some formal definitions say list comprehension can't use map at all, so even my version isn't kosher -but as close as one could get in Ruby I guess.
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Mac OS X Terminal: Map option+delete to “backward delete word”
...tty important at shell). In that case <Esc> b and <Esc> f mentioned in other answers are probably the best solution?
– Touko
Apr 27 '15 at 6:52
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How do I rename the extension for a bunch of files?
...solution (with only bash functionality, as opposed to external calls), see one of the other answers.
The following would do and does not require the system to have the rename program (although you would most often have this on a system):
for file in *.html; do
mv "$file" "$(basename "$file" ...
What does the ^ operator do in Java?
... "this or that, but not both!".
See also
Wikipedia: exclusive-or
Exponentiation in Java
As for integer exponentiation, unfortunately Java does not have such an operator. You can use double Math.pow(double, double) (casting the result to int if necessary).
You can also use the traditional bi...
Couldn't register with the bootstrap Server
...g a clean build.
I'm running XCode 3.5.4 and iOS 4.2.1
Hope this helps someone.
-Mike
UPDATE:
Same problem running Xcode 4.3 and iOS5 - just power-cycle the device.
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Android Drawing Separator/Divider Line in Layout?
...n't really want to use an image as it would be hard to match the other components to it. And I want it to be relatively positioned as well. Thanks
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Private pages for a private Github repo
....github.com for a private repository named foo which is accessible only one had access to the foo repository itself.
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