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What are Unwind segues for and how do you use them?
...ew controller.
Imagine you have something a MyNavController with A as its root view controller. Now you use a push segue to B. Now the navigation controller has A and B in its viewControllers array, and B is visible. Now you present C modally.
With unwind segues, you could now unwind "back" from C...
Go build: “Cannot find package” (even though GOPATH is set)
...the package "widget" the go command looks for src/pkg/widget inside the Go root, and then—if the package source isn't found there—it searches for src/widget inside each workspace in order.
(a "workspace" is a path entry in your GOPATH: that variable can reference multiple paths for your 'src, b...
Why are Oracle table/column/index names limited to 30 characters?
... can be extremely painful when doing migration projects from SQL Server or MySQL to Oracle. In Oracle Database 12cR2, the maximum length of most identifiers is now 128 characters.
This is a new feature in 12.2, according to (http://blog.dbi-services.com/oracle-12cr2-long-identifiers/). According t...
How can I create tests in Android Studio?
...m the base of the test, but if I run in Android Studio, the tests run from root_/app, however if I run from Gradle command line (or CI) then it is _root. (Ideally I'd like to access specific assets folders when run either way).
– mm2001
May 6 '17 at 18:21
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Set folder browser dialog start location
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Note that it's required to set RootFolder to Environment.SpecialFolder.Desktop or this may not work.
– Mike Lowery
Nov 24 '14 at 21:02
3...
What is the purpose of the -nodes argument in openssl?
...: lock down private.key
{ add HTTP server to ssl-cert group }
sudo chown root:ssl-cert private.key - change owner of private.key to root user, ssl-cert group
sudo chmod 640 private.key - change access permissions of private.key to owner R/W, group R
now, HTTP server should be able to start and re...
Bower and devDependencies vs dependencies
...s errors
-V, --verbose Makes output more verbose
--allow-root Allows running commands as root
See 'bower help <command>' for more information on a specific command.
and further, bower help install yields (see latest source):
Usage:
bower install [<optio...
How to do a LIKE query in Arel and Rails?
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Use .gsub(/[%_]/, '\\\\\0') for escaping MySql wildcard chars.
– aercolino
Aug 30 '13 at 10:58
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show 11 m...
Re-entrant locks in C#
...r code such that there is an object graph and you can acquire locks on the root of that object graph, then do so. This means you have one lock on that root object and therefore don't have to worry so much about the sequence in which you acquire/release locks.
(One further note, your example isn't t...
Red black tree over avl tree
...en, usually, algorithms continue to check/repaint nodes from bottom to the root of the tree. So, sometimes rotation O(1) can be better because it eliminates scanning remaining items O(log(n)). Because AVL tree, in average, makes more rotation, AVL tree is, usually, has better balance ~1.44 log(N) th...