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What is the difference between ArrayList.clear() and ArrayList.removeAll()?
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The source is strong in this one. (To all other answers: Use the source, Luke.) Notice how clear() could be implemented as just the one line, size=0; but garbage-collection wouldn't know to collect the elements in the unreachable portions of the array...
Remove empty elements from an array in Javascript
...gs, the above function wouldn't remove elements that are an empty string.
One typical pattern that I see often used is to remove elements that are falsy, which include an empty string "", 0, NaN, null, undefined, and false.
You can pass to the filter method, the Boolean constructor function, or re...
Best way to load module/class from lib folder in Rails 3?
... edited Jul 3 '14 at 5:49
typeoneerror
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answered Oct 18 '10 at 18:49
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Virtual/pure virtual explained
...ierarchy, rather than just the level at which it was created. Therefore if one method of the base class calls a virtual method, the version defined in the derived class will be used instead of the version defined in the base class.
This is in contrast to non-virtual functions, which can still be o...
Android adb “Unable to open sync connection!”
I can run and debug my Android app on my phone just fine, most of the time. Then, seemingly randomly, when I try to run or debug my app from Eclipse, the Console in Eclipse says:
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Why CancellationToken is separate from CancellationTokenSource?
...ated token. It would have been natural
to combine these two classes into one, but this design allows the two
key operations (initiating a cancellation request vs. observing and
responding to cancellation) to be cleanly separated. In particular,
methods that take only a CancellationToken can ...
What makes Lisp macros so special?
Reading Paul Graham's essays on programming languages one would think that Lisp macros are the only way to go. As a busy developer, working on other platforms, I have not had the privilege of using Lisp macros. As someone who wants to understand the buzz, please explain what makes this feature s...
This project references NuGet package(s) that are missing on this computer
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OK9999, at one point, you must have enabled it from an earlier version of Visual Studio, by right clicking on the solution and choosing "Enable NuGet package restore" which did it the old way. We don't need that anymore
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trying to animate a constraint in swift
...s and made sure the constraint on the left has the lower priority then the one that I am trying to animate on the right side.
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Find a Git branch containing changes to a given file
I have 57 local branches. I know I made a change to a certain file in one of them, but I'm not sure which one. Is there some kind of command I can run to find which branches contain changes to a certain file?
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