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if/else in a list comprehension
...er the for…in is part of list comprehensions and used to filter elements from the source iterable.
Conditional expressions can be used in all kinds of situations where you want to choose between two expression values based on some condition. This does the same as the ternary operator ?: that ex...
How do I use the ternary operator ( ? : ) in PHP as a shorthand for “if / else”?
Based on the examples from this page , I have the working and non-working code samples below.
14 Answers
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Fastest way to duplicate an array in JavaScript - slice vs. 'for' loop
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There are at least 6 (!) ways to clone an array:
loop
slice
Array.from()
concat
spread operator (FASTEST)
map A.map(function(e){return e;});
There has been a huuuge BENCHMARKS thread, providing following information:
for blink browsers slice() is the fastest method, concat() is a bit slow...
How to start an application using android ADB tools?
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@androiddeveloper See the monkey command below from depodefi: no need to specify activity name!
– 1111161171159459134
Feb 28 '15 at 8:17
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Java Security: Illegal key size or default parameters?
...oad (only required for versions before Java 8 u162)
Extract the jar files from the zip and save them in ${java.home}/jre/lib/security/.
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Why doesn't Objective-C support private methods?
...at complexity, it still wouldn't prevent all but the most casual developer from executing your supposedly "private" methods.
EDIT: One of the assumptions I've
noticed is that private messages would
have to go through the runtime
resulting in a potentially large
overhead. Is this absolute...
How to programmatically close a JFrame
... you need to dispatch a window closing event to the Window. The ExitAction from Closing An Application allows you to add this functionality to a menu item or any component that uses Actions easily.
frame.dispatchEvent(new WindowEvent(frame, WindowEvent.WINDOW_CLOSING));
...
Git ignore sub folders
... but something that I don't think is mentioned is that once you add a file from that directory into the repo, you can't ignore that directory/subdirectory that contains that file (git will ignore that directive).
To ignore already added files run
$ git rm --cached
Otherwise you'll have to remov...
What is the purpose of “&&” in a shell command?
...the || which is an OR_IF with similar semantics.
Grammar symbols, quoted from the documentation:
%token AND_IF OR_IF DSEMI
/* '&&' '||' ';;' */
And the Grammar (also quoted from the documentation), which shows that any number of AND_IFs (&&) and/or OR_I...
How can I check in a Bash script if my local Git repository has changes?
...t you meant was:
if [ -n "$CHANGED" ]; then
VN="$VN-mod"
fi
A quote from Git's GIT-VERSION-GEN:
git update-index -q --refresh
test -z "$(git diff-index --name-only HEAD --)" ||
VN="$VN-dirty"
It looks like you were copying that, but you just forgot that detail of quoting.
Of course, you c...