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Advantage of switch over if-else statement
...different area of the code, but now you have the opportunity to reuse this test. You also have more options for how to solve it. You could use std::set, for example:
bool RequiresSpecialEvent(int numError)
{
return specialSet.find(numError) != specialSet.end();
}
I'm not suggesting that thi...
Check if a string matches a regex in Bash script
...
You can use the test construct, [[ ]], along with the regular expression match operator, =~, to check if a string matches a regex pattern.
For your specific case, you can write:
[[ $date =~ ^[0-9]{8}$ ]] && echo "yes"
Or more a accu...
Symfony 2 EntityManager injection in service
...anymore. According to the documentation You would pass in:
services:
test.common.userservice:
class: Test\CommonBundle\Services\UserService
arguments: [ "@doctrine.orm.entity_manager" ]
And then they would be available in the order they were listed via the arguments (if ther...
How to check if a variable is set in Bash?
...tion this syntax but says just quote(Omitting the colon[ ":"] results in a test only for a parameter that is unset. .. ${parameter:+word} [means] If parameter is null or unset, nothing is substituted, otherwise the expansion of word is substituted.); the cited ref pubs.opengroup.org/onlinepubs/96999...
HTML select form with option to enter custom value
... This feature is only supported by about 50% of the browsers. Only latest firefox, chrome and opera support this; IE, Safari and mobile browsers don't. See http://caniuse.com/
– markmarijnissen
Mar 13 '14 at 10:37
...
How do I programmatically force an onchange event on an input?
...ey're extremely rare.
Rather, you would do this:
document.getElementById("test").onchange()
Look here for more options:
http://jehiah.cz/archive/firing-javascript-events-properly
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improve ...
Simple logical operators in Bash
...ditional expressions are mostly built on operators such as -n $variable to test if a variable is empty and -e $file to test if a file exists. There are also string equality operators: "$string1" == "$string2" (beware that the right-hand side is a pattern, e.g. [[ $foo == a* ]] tests if $foo starts w...
How to mkdir only if a directory does not already exist?
...ady exist, in which case I do not want to do anything. So I want to either test to see that the directory does not exist, or suppress the "File exists" error that mkdir throws when it tries to create an existing directory.
...
What characters are forbidden in Windows and Linux directory names?
.../, '\0'; the name . was the current directory, of course). It was used to test the Bourne shell and routinely wrought havoc on unwary programs such as backup programs.
Other people have covered the Windows rules.
Note that MacOS X has a case-insensitive file system.
1 It was Kernighan & Pik...
java.lang.NoClassDefFoundError: org/hamcrest/SelfDescribing
While running junit test in eclipse I am getting this Exception :
17 Answers
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