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How to use double or single brackets, parentheses, curly braces
.....8..2}
00 02 04 06 08
$ echo {D..T..4}
D H L P T
Note that the leading zero and increment features weren't available before Bash 4.
Thanks to gboffi for reminding me about brace expansions.
Double parentheses are used for arithmetic operations:
((a++))
((meaning = 42))
for ((i=0; i<10; i...
Javascript reduce on array of objects
...Ateer
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Is it expensive to use try-catch blocks even if an exception is never thrown?
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try has some minor costs associated with it. Java cannot do some optimizations on code in a try block that it would otherwise do. For example, Java will often re-arrange instructions in a method to make it run faster - but Java also needs to guarantee that if an exception is thrown, the method's...
How do I create an HTML table with a fixed/frozen left column and a scrollable body?
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If you want a table where only the columns scroll horizontally, you can position: absolute the first column (and specify its width explicitly), and then wrap the entire table in an overflow-x: scroll block. Don't bother trying this in IE7, however...
Relevant HTML & CSS:
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Correct way to use StringBuilder in SQL
...hurn than just the straight concat you quoted. (Until/unless the JVM optimizer sees that the explicit StringBuilder in the code is unnecessary and optimizes it out, if it can.)
If the author of that code wants to use StringBuilder (there are arguments for, but also against; see note at the end of t...
Is there a generator version of `string.split()` in Python?
...
def split_iter(string):
return (x.group(0) for x in re.finditer(r"[A-Za-z']+", string))
Demo:
>>> list( split_iter("A programmer's RegEx test.") )
['A', "programmer's", 'RegEx', 'test']
edit: I have just confirmed that this takes constant memory in python 3.2.1, assuming my testi...
facebook: permanent Page Access Token?
...donut
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Reference — What does this symbol mean in PHP?
...t letters in PHP:
$i = "a";
while ($i < "c") {
echo $i++;
}
Once z is reached aa is next, and so on.
Note that character variables can be incremented but not decremented and even so only plain ASCII characters (a-z and A-Z) are supported.
Stack Overflow Posts:
Understanding Incre...
C++ templates that accept only certain types
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answered May 17 '09 at 10:37
j_random_hackerj_random_hacker
46.3k99 ...
How to vertically center a container in Bootstrap?
...the flex item - .container in this case - may not appear at the center horizontally. It seems the applied left/right margin of auto doesn't have any effect on the flex item.
Therefore we need to align it by box-pack / justify-content.
For further details and/or vertical alignment of columns, you c...