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How do I check the difference, in seconds, between two dates?

There has to be an easier way to do this. I have objects that want to be refreshed every so often, so I want to record when they were created, check against the current timestamp, and refresh as necessary. ...
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How to add to an existing hash in Ruby

In regards to adding an key => value pair to an existing populated hash in Ruby, I'm in the process of working through Apress' Beginning Ruby and have just finished the hashes chapter. ...
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Is there any way to put malicious code into a regular expression?

I want to add regular expression search capability to my public web page. Other than HTML encoding the output, do I need to do anything to guard against malicious user input? ...
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Best Practice - NSError domains and codes for your own project/app

There is a previous SO post regarding setting up error domains for your own frameworks, but what is the best practice regarding setting up error domains and custom error codes for your own project/app ? ...
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Can an AJAX response set a cookie?

Can an AJAX response set a cookie? If not, what is my alternative solution? Should I set it with Javascript or something similar? ...
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HTML.ActionLink vs Url.Action in ASP.NET Razor

Is there any difference between HTML.ActionLink vs Url.Action or they are just two ways of doing the same thing? 6 Answ...
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Difference between os.getenv and os.environ.get

Is there any difference at all between both approaches? 5 Answers 5 ...
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What is the entry point of swift code execution?

There is no main() method in swift. The program must start the execution from somewhere. So what is the entry point of swift code execution and how is it decided? ...
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difference between use and require

Can anyone explain the difference between use and require , both when used directly and as :use and :require in the ns macro? ...
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LINQ to SQL - Left Outer Join with multiple join conditions

I have the following SQL, which I am trying to translate to LINQ: 6 Answers 6 ...