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How to check if a value exists in a dictionary (python)
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If your key does'nt exist, will return none value.
foo = d[key] # raise error if key doesn't exist
foo = d.get(key) # return none if key doesn't exist
Content relevant to versions less than 3.0 and greater than 5.0.
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Adding two Java 8 streams, or an extra element to a stream
... to type it in your IDE? Without .map(identity()) you will get compilation error. I want to return Stream<T> but statement: return Stream.of(streams).reduce(Stream.empty(),Stream::concat) returns Stream<? extends T>.(Someting<T> is subtype of Something<? extends T>, not the o...
Proper usage of Optional.ifPresent()
...es the need for you to ever call get() manually. Calling get() manually is error prone, as it is easy to forget to check isPresent first, but it's impossible for you to forget if you use ifPresent
– dustinroepsch
Dec 2 '19 at 21:47
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How to detect if JavaScript is disabled?
...g future browsers which you cannot currently test in), as they may perform error recovery in different ways.
– Quentin
Oct 27 '09 at 10:10
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Object-orientation in C
...just your pointers based on the proper offsets, which is really tricky and error-prone.
Another (tricky) thing you can do is change the dynamic type of an object at runtime! You just reassign it a new vtable pointer. You can even selectively change some of the virtual functions while keeping othe...
How Scalable is SQLite? [closed]
...I just remember slow page loads and occasionally getting a database locked error when trying to execute queries from the shell in sqlite. That said, I am running another site from SQLite just fine. The difference is that the site is static (i.e. I'm the only one that can change the database) and so ...
How can I remove an SSH key?
...If you're trying to perform an SSH-related operation and get the following error:
$ git fetch
no such identity: <ssh key path>: No such file or directory
You can remove the missing SSH key from your SSH agent with the following:
$ eval `ssh-agent -s` # start ssh agent
$ ssh-add -D <ssh ke...
Debug vs Release in CMake
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@thiagowfx -i option results in this error message: The "cmake -i" wizard mode is no longer supported.. I'm using cmake 3.7.1
– Philipp Claßen
Jan 4 '17 at 21:01
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Should I use @EJB or @Inject
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Nov 2009, 20:48 America/New_York | Link Gavin King
That error is very strange, since EJB local references should always
be serializable. Bug in glassfish, perhaps?
Basically, @Inject is always better, since:
it is more typesafe,
it supports @Alternatives, and
it is aware o...
Remove a folder from git tracking
...--ignore-unmatch is important here, without that option git will exit with error on the first file not in the index.
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