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What is a loop invariant?

...rograms. We make a single statement that we focus on proving true, and we call it the loop invariant. This organizes our logic. While we can just as well argue informally about the correctness of some algorithm, using a loop invariant forces us to think very carefully and ensures our reasoning is ai...
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How do I execute a Git command without being in the repository?

...Try: git --git-dir=/home/repo/.git log It is important to give the path all the way up to the .git directory of your repository. Otherwise you will get only an error message that says something like: fatal: Not a git repository ...
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How big should a UIBarButtonItem image be?

...n "about 20x20" though. If you use an image of exactly 20x20px it will actually not map 1:1, and the button won't be square. – Clafou Jul 22 '12 at 22:24 1 ...
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Understanding the ngRepeat 'track by' expression

... well, that's easy: just have a look at the code, it's all open source ;) – nilsK Mar 31 '14 at 13:22 4 ...
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How to compare variables to undefined, if I don’t know whether they exist? [duplicate]

...s a string, and doesn't generate an error if the variable doesn't exist at all. share | improve this answer | follow | ...
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How to make git-diff and git log ignore new and deleted files?

... Is there a way to actually exclude just one type of data? Something like --diff-filter=!D – Kamil Dziedzic Aug 29 '14 at 8:44 2...
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Why is it not advisable to have the database and web server on the same machine?

...dicated network connection between the two, more maintenance, etc.), especially for a small application, where neither piece is using too much CPU or memory? Even with two servers, with one server compromised, an attacker could still do serious damage, either by deleting the database, or messing wi...
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Maven project.build.directory

...org/apache/maven/model There you'll find the pom-4.0.0.xml. It contains all those "short cuts": <project> ... <build> <directory>${project.basedir}/target</directory> <outputDirectory>${project.build.directory}/classes</outputDirectory>...
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Why does C# allow {} code blocks without a preceding statement?

Why does C# allow code blocks without a preceding statement (e.g. if , else , for , while )? 9 Answers ...
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date format yyyy-MM-ddTHH:mm:ssZ

...1123 (HTTP date, the "u" formatter) isn't meant to give time zone offsets. All times are intended to be GMT/UTC. share | improve this answer | follow | ...