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How to implement a rule engine?

..."Contains", "C#" ) }; // compile the rules once var compiledRules = rules.Select(r => CompileRule(r)).ToList(); public bool MatchesAllRules(User user) { return compiledRules.All(rule => rule(user)); } Here is the implementation of BuildExpr: Expression BuildExpr(Rule r, ParameterExpress...
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How do you use bcrypt for hashing passwords in PHP?

...pt works internally. And there are a TON of answers about that. Here are a selection that I've written, that I won't copy/paste here, but link to: Fundamental Difference Between Hashing And Encryption Algorithms - Explaining the terminology and some basic information about them. About reversing ha...
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Perl build, unit testing, code coverage: A complete working example

...ESS_PERL_SWITCHES}. For example: -MDevel::Cover=+ignore,.t$,+inc,/app/lib,-select,MyModule.pm where /app/lib is the application-private library and MyModule.pm is the module under test. – Michael Carman Apr 27 '10 at 16:33 ...
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What does enctype='multipart/form-data' mean?

...do printf '' | nc -l 8000 localhost; done Open the HTML on your browser, select the files and click on submit and check the terminal. nc prints the request received. Tested on: Ubuntu 14.04.3, nc BSD 1.105, Firefox 40. multipart/form-data Firefox sent: POST / HTTP/1.1 [[ Less interesting hea...
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What is polymorphism, what is it for, and how is it used?

...g different courses of action, you create interchangeable objects that you select based on your needs. That is the basic goal of polymorphism. share | improve this answer | ...
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Multiple INSERT statements vs. single INSERT with multiple VALUES

...t One place where this information is leveraged is shown by @Lieven here SELECT * FROM (VALUES ('Lieven1', 1), ('Lieven2', 2), ('Lieven3', 3))Test (name, ID) ORDER BY name, 1/ (ID - ID) Because at compile time it can determine that the Name column has no duplicates it...
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Algorithm to generate a crossword

...the previous steps can just be done once. First step of the algorithm is select an empty wordslot (grid word) at random and fill it with a candidate word from its associated wordlist (randomization enables to produce different solutons in consecutive executions of the algorithm) ( complexity O(1)...
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Best practices for reducing Garbage Collector activity in Javascript

...though it's requiring me to wait 24 hours before I award it (even though I selected 'reward existing answer'). Will be yours tomorrow... – UpTheCreek Sep 11 '13 at 10:18 ...
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Download a file with Android, and showing the progress in a ProgressDialog

...ime (12 AM for instance), the service will download all the link that user selected before. I mean the service I need has to be able to queue download links, and then download all of them (one by one or parallel, depend on user). Thank you – Hoang Trinh
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Difference between shared objects (.so), static libraries (.a), and DLL's (.so)?

... FYI: g++ has __attribute__ syntax for selectively 'export' symbols: #define DLLEXPORT __attribute__ ((visibility("default"))) #define DLLLOCAL __attribute__ ((visibility("hidden"))) – Brian Cannard Jul 10 '14 at 14:49 ...