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How do I check if a variable exists in a list in BASH
...~ (^|[[:space:]])$x($|[[:space:]]) ]] && echo 'yes' || echo 'no'
or create a function:
contains() {
[[ $1 =~ (^|[[:space:]])$2($|[[:space:]]) ]] && exit(0) || exit(1)
}
to use it:
contains aList anItem
echo $? # 0： match, 1: failed
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What is the difference between LINQ ToDictionary and ToLookup
...o the same with a dictionary and you'll get an exception.
So: how many records share each key?
An overly simplified way of looking at it is that a Lookup<TKey,TValue> is roughly comparable to a Dictionary<TKey,IEnumerable<TValue>>
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Checking in packages from NuGet into version control?
Prior to NuGet, it was common accepted 'best practice' to check-in all external DLLs used on a project. Typically in a Libs or 3rdParty directory.
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What is the difference between Scrum and Agile Development? [closed]
...development.
Each Sprint starts with a planning meeting, where the tasks for the sprint are identified and an estimated commitment for the sprint goal is made. A Sprint ends with a review or retrospective meeting where the progress is reviewed and lessons for the next sprint are identified. During ...
How can I concatenate two arrays in Java?
...swers the question? Sure, having an extra dependency is probably overkill for this specific situation, but no harm is done in calling out that it exists, especially since there's so many excellent bits of functionality in Apache Commons.
– Rob
Oct 12 '08 at 15:...
Concatenating null strings in Java [duplicate]
Why does the following work? I would expect a NullPointerException to be thrown.
5 Answers
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Volatile boolean vs AtomicBoolean
...an variable concurrently, with an AtomicBoolean you can be sure it has the original value afterwards, with a volatile boolean, you can't.
So whenever you have more than one thread modifying a field, you need to make it atomic or use explicit synchronization.
The purpose of volatile is a different...
How can I assign an ID to a view programmatically?
...ML (when possible) and via code (programmatically.) The id is most useful for getting references for XML-defined Views generated by an Inflater (such as by using setContentView.)
Assign id via XML
Add an attribute of android:id="@+id/somename" to your view.
When your application is built, the and...
How do I delete/remove a shell function?
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In Zsh:
unfunction z
That's another (arguably better) name for unhash -f z or unset -f z and is consistent with the rest of the family of:
unset
unhash
unalias
unlimit
unsetopt
When in doubt with such things, type un<tab> to see the complete list.
(Slightly related: It's al...
How can I create a UIColor from a hex string?
How can I create a UIColor from a hexadecimal string format, such as #00FF00 ?
47 Answers
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