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Better way to check variable for null or empty string?
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Beware false negatives from the trim() function — it performs a cast-to-string before trimming, and thus will return e.g. "Array" if you pass it an empty array. That may not be an issue, depending on how you process your data, but with the code ...
Is it possible to declare a variable in Gradle usable in Java?
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Here are two ways to pass value from Gradle to use in Java;
Generate Java Constants
android {
buildTypes {
debug {
buildConfigField "int", "FOO", "42"
buildConfigField "String", "FOO_STRING", "\"foo\""
buildC...
When does a process get SIGABRT (signal 6)?
...arios where a process gets a SIGABRT in C++? Does this signal always come from within the process or can this signal be sent from one process to another?
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Meaning of = delete after function declaration
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@Reb, =delete makes the method inaccessible even from contexts that can see private methods (i.e. within the class and its friends). This removes any uncertainty when you're reading the code. @Prasoon, that second example is still only deleting constructors - it would be ...
Is there an equivalent to CTRL+C in IPython Notebook in Firefox to break cells that are running?
...thing that is running in iPython Notebook and you started iPython Notebook from a terminal, you can hit CTRL+C twice in that terminal to interrupt the entire iPython Notebook server. This will stop iPython Notebook alltogether, which means it won't be possible to restart or save your work, so this i...
Hash collision in git
...y Paradox" or "Birthday Problem", which states that when you pick randomly from a given set, you need surprisingly few picks before you are more likely than not to have picked something twice. But "surprisingly few" is a very relative term here.
Wikipedia has a table on the probability of Birthday P...
How to disable Django's CSRF validation?
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If you just need some views not to use CSRF, you can use @csrf_exempt:
from django.views.decorators.csrf import csrf_exempt
@csrf_exempt
def my_view(request):
return HttpResponse('Hello world')
You can find more examples and other scenarios in the Django documentation:
https://docs.djan...
How to determine the version of the C++ standard used by the compiler?
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From the Bjarne Stroustrup C++0x FAQ:
__cplusplus
In C++0x the macro __cplusplus will be set to a value that differs
from (is greater than) the current 199711L.
Although this isn't as helpful as one would like. g...
PHP parse/syntax errors; and how to solve them
...programming languages. It has rigid grammar rules, which it cannot recover from when encountering misplaced symbols or identifiers. It can't guess your coding intentions.
Most important tips
There are a few basic precautions you can always take:
Use proper code indentation, or adopt any lofty ...
How to generate a random string in Ruby
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BTW SecureRandom was removed from ActiveSupport in version 3.2. From the changelog: "Removed ActiveSupport::SecureRandom in favor of SecureRandom from the standard library".
– Marc
Jan 20 '12 at 21:57
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