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How to implement a rule engine?
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This snippet compiles the Rules into fast executable code (using Expression trees) and does not need any complicated switch statements:
(Edit : full working example with generic method)
public Func<User, bool> CompileRule(Rule r)
{
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Styling input buttons for iPad and iPhone
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The link above is now dead, unfortunately (thinkvitamin.com/design/…).
– Per Quested Aronsson
Sep 5 '12 at 11:00
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Is it possible in Java to access private fields via reflection [duplicate]
... Coding Guidelines Version 2.0 for the Java Programming Language: java.sun.com/security/seccodeguide.html )
– Tom Hawtin - tackline
Oct 12 '09 at 18:03
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Error-Handling in Swift-Language
...g this way you do not get the error object.
Which means that you can also combine try? with useful statements like:
if let dragon = try? summonDefaultDragon()
or
guard let dragon = try? summonDefaultDragon() else { ... }
Finally, you can decide that you know that error will not actually occur...
How to stop and restart memcached server?
How to stop and restart memcached server 1.4.5 in linux OS from command line?
12 Answers
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How to dismiss ViewController in Swift?
...tionController?.popViewController(animated: true)
dismiss(animated: true, completion: nil)
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How do I determine the size of an object in Python?
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Run ssh and immediately execute command [duplicate]
I'm trying to find UNIX or bash command to run a command after connecting to an ssh server. For example:
3 Answers
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What is the difference between “INNER JOIN” and “OUTER JOIN”?
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Assuming you're joining on columns with no duplicates, which is a very common case:
An inner join of A and B gives the result of A intersect B, i.e. the inner part of a Venn diagram intersection.
An outer join of A and B gives the results of A union B, i.e. the outer parts of a Venn diagram un...