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What is the difference between Gemfile and Gemfile.lock in Ruby on Rails
I am a beginner to Ruby on Rails and I am using Rails 3.0.9.
3 Answers
3
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Collections.emptyMap() vs new HashMap()
...rrays or collections, not null" demonstrates returning an empty collection and perhaps even demonstrates using these emptyList(), emptySet(), and emptyMap() methods on the Collections class to get an empty collection that also has the additional benefit of being immutable. From Item #15 "Minimize ...
How to flatten tree via LINQ?
...er style", convert Flatten to a generic extension method that takes a tree and a function that produces descendants from a node:
public static IEnumerable<T> Flatten<T>(
this IEnumerable<T> e
, Func<T,IEnumerable<T>> f
) => e.SelectMany(c => f(c).Flatten(f)...
SQL-Server: The backup set holds a backup of a database other than the existing
... too came across this issue.
Solution :
Don't create an empty database and restore the .bak file on to it.
Use 'Restore Database' option accessible by right clicking the "Databases" branch of the SQL Server Management Studio and provide the database name while
providing the source to restore.
Al...
Determine installed PowerShell version
How can I determine what version of PowerShell is installed on a computer, and indeed if it is installed at all?
19 Answers...
Eclipse hangs at the Android SDK Content Loader
...lease 20120920-0800) on OS X 10.8.2 for a few weeks now, building apps for Android 3.0 and above. I have a quad core i7 MacBook Pro with an SSD, so performance is not an issue. Everything was fine.
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What is an anti-pattern?
I am studying patterns and anti-patterns. I have a clear idea about patterns, but I don't get anti-patterns. Definitions from the web and Wikipedia confuse me a lot.
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Windows 8.1 / Windows 10 breaks my ASP.NET / IIS : “Service unavailable”
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It looks like a simple uninstall and re-install of the rewrite module will do the trick.
Edit: As others have said - try a repair first - if it works then that should be faster.
It doesn't look like the Microsoft Web Platform Installer is able to uninstall...
Visual Studio debugging “quick watch” tool and lambda expressions
...ariables become fields on compiler-generated classes), with a bit of smoke and mirrors.
As such, I'm not in the least surprised that you can't use them idly - there is a lot of compiler work (and type generation behind the scenes) that supports this magic.
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.NET HashTable Vs Dictionary - Can the Dictionary be as fast?
I am trying to figure out when and why to use a Dictionary or a HashTable. I have done a bit of a search on here and have found people talking about the generic advantages of the Dictionary which I totally agree with, which leads the boxing and unboxing advantage for a slight performance gain.
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