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Hidden features of Scala
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Okay, I had to add one more. Every Regex object in Scala has an extractor (see answer from oxbox_lakes above) that gives you access to the match groups. So you can do something like:
// Regex to split a date in the format Y/M/D.
val regex = "(\\...
Why doesn't Java support unsigned ints?
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This is from an interview with Gosling and others, about simplicity:
Gosling: For me as a language designer, which I don't really count myself as these days, what "simple" really ended up meaning was could I expect J. Random Develop...
How to delete a row by reference in data.table?
My question is related to assignment by reference versus copying in data.table . I want to know if one can delete rows by reference, similar to
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How to write DataFrame to postgres table?
There is DataFrame.to_sql method, but it works only for mysql, sqlite and oracle databases. I cant pass to this method postgres connection or sqlalchemy engine.
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Rails: fields_for with index?
Is there a method (or way to pull off similar functionality) to do a fields_for_with_index ?
9 Answers
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List of standard lengths for database fields
I'm designing a database table and once again asking myself the same stupid question: How long should the firstname field be?
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How to check if an app is installed from a web-page on an iPhone?
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As far as I know you can not, from a browser, check if an app is installed or not.
But you can try redirecting the phone to the app, and if nothing happens redirect the phone to a specified page, like this:
setTimeout(function () { window.location = "https...
Android adding simple animations while setvisibility(view.Gone)
I have designed a simple layout.I have finished the design without animation, but now I want to add animations when textview click event and I don't know how to use it.
Did my xml design looks good or not?
Any suggestions would be appreciated.
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What's the best way of implementing a thread-safe Dictionary?
I was able to implement a thread-safe Dictionary in C# by deriving from IDictionary and defining a private SyncRoot object:
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When to use NSInteger vs. int
...e using NSInteger vs. int when developing for iOS? I see in the Apple sample code they use NSInteger (or NSUInteger ) when passing a value as an argument to a function or returning a value from a function.
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