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How to check if a given directory exists in Ruby
I am trying to write a script which automatically checks out or updates a Subversion URL based on whether a specified directory exists or not.
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Difference between single and double quotes in Bash
In Bash, what are the differences between single quotes ( '' ) and double quotes ( "" )?
6 Answers
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Is it possible to create static classes in PHP (like in C#)?
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What happens if two threads call greet at the same time? As there is no synchronisation, won't initialise be called twice (which in this case is ok, but in many other cases would not). Or is php single threaded and non-preemptive like node?
– John Little...
Easy way to dismiss keyboard?
...il targeted action to the application, it'll resign first responder at any time without having to worry about which view currently has first responder status.
Objective-C:
[[UIApplication sharedApplication] sendAction:@selector(resignFirstResponder) to:nil from:nil forEvent:nil];
Swift 3.0:
UIA...
Java Hashmap: How to get key from value?
...ou will have to ensure the 1:1 relationship between keys and values at the time of inserting the value into the map. This is easier said than done.
Once you can ensure that, use the entrySet() method to obtain the set of entries (mappings) in the Map. Once you have obtained the set whose type is Ma...
How to get certain commit from GitHub project
...hat github does have a history of, but were erased from the "official" git timeline. Using this, you can get a zip snapshot of a commit that was rebased into oblivion, push that commit to a new branch, fetch that branch into an existing repo, and cherry-pick it back into existence.
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How to filter None's out of List[Option]?
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If you want to get rid of the options at the same time, you can use flatten:
scala> someList.flatten
res0: List[String] = List(Hello, Goodbye)
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iPhone Debugging: How to resolve 'failed to get the task for process'?
...ribution, and tried to run the app on the device (I have done this several times in the past, without any problem).
15 Answ...
What's the point of malloc(0)?
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@jldupont: At least the Microsoft C Run-Time library returns a unique pointer for malloc(0). However, in the very same implementation of the standard C library, realloc(ptr, 0) frees ptr and returns NULL.
– Medinoc
Apr 12 '18 ...
Register Application class in Manifest?
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The documentation says "fully qualified name". I have one time experienced a 3rd party tool interpreting this literally, and not working when trying to find the application class, if specified relatively. Just a warning.
– Jens Vesti
Jan 31 '1...