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What does “program to interfaces, not implementations” mean?
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Interfaces are just contracts or signatures and they don't know
anything about implementations.
Coding against interface means, the client code always holds an Interface object which is supplied by a factory. Any instance returned by the factory would be of type In...
How to write a cron that will run a script every day at midnight?
I have heard crontab is a good choice, but how do I write the line and where do I put it on the server?
6 Answers
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How do I associate file types with an iPhone application?
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File type handling is new with iPhone OS 3.2, and is different than the already-existing custom URL schemes. You can register your application to handle particular document types, and any application that uses a document controller can...
How and why do I set up a C# build machine? [closed]
...ct. I've proposed setting up a build machine which will do nightly builds and tests of the project, because I understand that this is a Good Thing. Trouble is, we don't have a whole lot of budget here, so I have to justify the expense to the powers that be. So I want to know:
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Difference between __str__ and __repr__?
What is the difference between __str__ and __repr__ in Python?
23 Answers
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What's the best way to put a c-struct in an NSArray?
... to store c-structures in an NSArray ? Advantages, disadvantages, memory handling?
11 Answers
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Swift 编程语言入门教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...tive-C的命名参数和动态对象模型。提供了对Cocoa框架和mix-and-match的互操作性。基于这些基础，Swift引入了很多新功能和结合面向过程和面向对象的功能。
Swift对新的程序员也是友好的。他是工业级品质的系统编程语言，却又像脚...
Check if at least two out of three booleans are true
...ewer recently asked me this question: given three boolean variables, a, b, and c, return true if at least two out of the three are true.
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Sleep until a specific time/date
I want my bash script to sleep until a specific time. So, I want a command like "sleep" which takes no interval but an end time and sleeps until then.
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Significant new inventions in computing since 1980
...World Wide Web ("distributed hypertext via simple mechanisms") as proposed and implemented by Tim Berners-Lee started in 1989/90.
While the idea of hypertext had existed before (Nelson’s Xanadu had tried to implement a distributed scheme), the WWW was a new approach for implementing a distribute...