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What is the difference between “#!/usr/bin/env bash” and “#!/usr/bin/bash”?
...r in a completely different hierarchy branch (/opt/..., /Applications/..., etc.). That's why these often use the #!/usr/bin/env xxx shebang syntax.
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Does PostgreSQL support “accent insensitive” collations?
...Security for client programs has been tightened with Postgres 10.3 / 9.6.8 etc. You need to schema-qualify function and dictionary name as demonstrated when used in any indexes. See:
'text search dictionary “unaccent” does not exist' entries in postgres log, supposedly during automatic analyze...
Different types of thread-safe Sets in Java
...t; and replacing the whole set on each modification.
The implementation sketch:
public abstract class CopyOnWriteSet<E> implements Set<E> {
private final AtomicReference<Set<E>> ref;
protected CopyOnWriteSet( Collection<? extends E> c ) {
ref = new A...
How do I adjust the anchor point of a CALayer, when Auto Layout is being used?
... the frame bigger, so we'd need to update any width or height constraints, etc..
If you're only using the transform for a temporary animation, then what's above may suffice since I don't believe auto layout will prevent the in-flight animation from presenting images that represent purely transient ...
OAuth 2.0: Benefits and use cases — why?
...oint of the OAuth specs is for a content provider (e.g. Facebook, Twitter, etc.) to assure a server (e.g. a Web app that wishes to talk to the content provider on behalf of the client) that the client has some identity. What three-legged authentication offers is the ability to do that without the cl...
MongoDB Many-to-Many Association
...use them.
For the case of the User in Roles model, the operations that stretch our atomic write avoidance of locks is adding or removing a User from a Role. In either case, a successful operation results in both a single User and a single Role document being updated. If something fails, it is eas...
How does the compilation/linking process work?
...nd I have deliberately not used the jargon of object files, symbol tables, etc. which to me is part of the confusion.
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Which is more preferable to use: lambda functions or nested functions ('def')?
..."very rare", it is common for key functions to sorted or itertools.groupby etc., e.g. sorted(['a1', 'b0'], key= lambda x: int(x[1]))
– Chris_Rands
Apr 9 '18 at 12:09
add a com...
Understanding NSRunLoop
...ndle system input sources (sockets, ports, files, keyboard, mouse, timers, etc).
Each NSThread has its own run loop, which can be accessed via the currentRunLoop method.
In general, you do not need to access the run loop directly, though there are some (networking) components that may allow you to...
Break a previous commit into multiple commits
...e intermediate revisions are consistent (they compile, pass the testsuite, etc.) you should use git stash to stash away the not-yet-committed changes after each commit, test, and amend the commit if fixes are necessary.