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What is the rationale behind having companion objects in Scala?
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The companion object basically provides a place where one can put "static-like" methods. Furthermore, a companion object, or companion module, has full access to the class members, including private ones.
Companion objects are great for encapsulating...
How can I remove duplicate rows?
.../02/18/not-exists-vs-not-in Out of the 3 I think NOT EXISTS performs best. All three will generate a plan with a self join though that can be avoided.
– Martin Smith
Jan 14 '11 at 9:17
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Why are you not able to declare a class as static in Java?
...This method doesn't work
public static InnerClass getAnInnerClassStatically(){
return new InnerClass();
}
}
class OtherClass{
//Use of a static nested class:
private OuterClass.StaticNestedClass staticNestedClass = new OuterClass.StaticNestedClass();
//Doesn't work
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Why doesn't .NET/C# optimize for tail-call recursion?
...n was responsible for the machine code.
The CLR itself does support tail call optimization, but the language-specific compiler must know how to generate the relevant opcode and the JIT must be willing to respect it.
F#'s fsc will generate the relevant opcodes (though for a simple recursion it may j...
Detect IE version (prior to v9) in JavaScript
...9. It's just not worth our time and money to support IE pre-v9 . Users of all other non-IE browsers are fine and shouldn't be bounced. Here's the proposed code:
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Cron and virtualenv
...tom, if that is your real name, you're my hero. I never knew that about sh vs bash and source files. You've shone a light into my little bash-scripting world dude. Thanks.
– joemurphy
Feb 25 '16 at 18:22
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What is the advantage of using abstract classes instead of traits?
...or parameters
Abstract classes are fully interoperable with Java. You can call them from Java code without any wrappers. Traits are fully interoperable only if they do not contain any implementation code
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How to show method parameter tooltip in C#?
VS2010:
4 Answers
4
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In Docker, what's the difference between a container and an image? [duplicate]
... running (or stopped) instances of some image.
Start with the base image called 'ubuntu'. Let's run bash interactively within the ubuntu image and create a file. We'll use the -i and -t flags to give us an interactive bash shell.
$ docker run -i -t ubuntu /bin/bash
root@48cff2e9be75:/# ls
bin bo...
Change text from “Submit” on input tag
...oint. Recommend also reading Quentin's answer below regarding use of input vs button when trying obtain the value of your element.
– Govind Rai
Jun 14 '16 at 20:51
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