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What is the difference between a var and val definition in Scala?

What is the difference between a var and val definition in Scala and why does the language need both? Why would you choose a val over a var and vice versa? ...
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How do Mockito matchers work?

Mockito argument matchers (such as any , argThat , eq , same , and ArgumentCaptor.capture() ) behave very differently from Hamcrest matchers. ...
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rvm installation not working: “RVM is not a function”

...inal after this setting the flag. Sometimes it is required to set the command to /bin/bash --login. For remote connections it is important to understand the differene between running interactive ssh session and executing single commands. While running ssh server and then working with the server...
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CodeFile vs CodeBehind

What is the difference between CodeFile ="file.ascx.cs" and CodeBehind ="file.ascx.cs" in the declaration of a ASP.NET user control? ...
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Retrieving the last record in each group - MySQL

...dowing functions, like almost all popular SQL implementations. With this standard syntax, we can write greatest-n-per-group queries: WITH ranked_messages AS ( SELECT m.*, ROW_NUMBER() OVER (PARTITION BY name ORDER BY id DESC) AS rn FROM messages AS m ) SELECT * FROM ranked_messages WHERE rn = 1...
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How do I fix blurry text in my HTML5 canvas?

I am a total n00b with HTML5 and am working with the canvas to render shapes, colors, and text. In my app, I have a view adapter that creates a canvas dynamically, and fills it with content. This works really nicely, except that my text is rendered very fuzzy/blurry/stretched. I have seen a ...
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Why am I getting tree conflicts in Subversion?

I had a feature branch of my trunk and was merging changes from my trunk into my branch periodically and everything was working fine. Today I went to merge the branch back down into the trunk and any of the files that were added to my trunk after the creation of my branch were flagged as a "tree con...
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What are the use cases for selecting CHAR over VARCHAR in SQL?

...R(10) = 10 bytes (4 bytes of waste) The bottom line is CHAR can be faster and more space-efficient for data of relatively the same length (within two characters length difference). Note: Microsoft SQL has 2 bytes of overhead for a VARCHAR. This may vary from DB to DB, but generally, there is at lea...
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Why do people use __(double underscore) so much in C++

I was having a look through some open source C++ code and notice a lot of double under scores where used in the code, mainly at the start of variable names. ...
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jQuery Call to WebService returns “No Transport” error

... 1 Take a look at this blog post. Update 2 If this is indeed the problem (and I suspect it is), you might want to check out JSONP as a solution. Here are a few links that might help you get started: https://en.wikipedia.org/wiki/JSON http://remysharp.com/2007/10/08/what-is-jsonp/ http://www.west-...