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How do RVM and rbenv actually work?
...
Short explanation: rbenv works by hooking into your environment's PATH. The concept is simple, but the devil is in the details; full scoop below.
First, rbenv creates shims for all the commands (ruby, irb, rake, gem and so on) across all your installed ve...
JPA EntityManager: Why use persist() over merge()?
...rsist() semantics:
It makes sure that you are inserting and not updating by mistake.
Example:
{
AnyEntity newEntity;
AnyEntity nonAttachedEntity;
AnyEntity attachedEntity;
// Create a new entity and persist it
newEntity = new AnyEntity();
em.persist(newEntity);
...
Using Auto Layout in UITableView for dynamic cell layouts & variable row heights
...e of these subviews drive the height of the table view cell's content view by making sure the content compression resistance and content hugging constraints in the vertical dimension for each subview are not being overridden by higher-priority constraints you have added. (Huh? Click here.)
Remember...
Authentication versus Authorization
...a claim about yourself e.g. age. When you drink, you authenticate your age by showing an ID. Then you may be authorized to drink depending on your age and the jurisdiction you are in (you can drink if >21 in the US >18 in Europe)
– David Brossard
Nov 17 '...
How can I count the number of matches for a regex?
...sets the matcher, and then sets the region to start at the index specified by the start parameter and end at the index specified by the end parameter. Try this. while(matcher.find()){ matcher.region(matcher.end()-1, str.length()); count++; }
– Mukesh Kumar Gupta
...
What is the advantage of using async with MVC5?
...s using SynchronizationContext.Post. If it does, the overhead is dominated by the thread switch it performs as it resumes. That means that the current SynchronizationContext makes a big difference." (Async in C# 5.0, 2012, Alex Davies)
– annemartijn
Mar 22 '14 ...
Error in Swift class: Property not initialized at super.init call
...ignated initializer must ensure that all of the
“properties introduced by its class are initialized before it
delegates up to a superclass initializer.”
Excerpt From: Apple Inc. “The Swift Programming Language.” iBooks.
https://itunes.apple.com/us/book/swift-programming-language/i...
Why doesn't Console.Writeline, Console.Write work in Visual Studio Express?
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Console.WriteLine writes your output to the console window opened by your application (think black window with white text that appears when you open the Command Prompt.) Try System.Diagnostics.Debug.WriteLine instead.
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How do JavaScript closures work?
...ardless of when and where the function is called.
If a function was called by a function, which in turn was called by another function, then a chain of references to outer lexical environments is created. This chain is called the scope chain.
In the following code, inner forms a closure with the lex...
How to display full (non-truncated) dataframe information in html when converting from pandas datafr
...e aside, the number of columns were being truncated for me, as represented by and ellipsis (...) near the middle of my table. Thanks!
– four43
Jan 1 '18 at 18:30
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