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Given a class, see if instance has method (Ruby)

I know in Ruby that I can use respond_to? to check if an object has a certain method. 12 Answers ...
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How to wait for async method to complete?

I'm writing a WinForms application that transfers data to a USB HID class device. My application uses the excellent Generic HID library v6.0 which can be found here . In a nutshell, when I need to write data to the device, this is the code that gets called: ...
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IntelliJ IDEA with Junit 4.7 “!!! JUnit version 3.8 or later expected:”

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What is the difference between iterator and iterable and how to use them?

I am new in Java and I'm really confused with iterator and iterable. Can anyone explain to me and give some examples? 13 An...
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Numpy argsort - what is it doing?

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How do I copy a hash in Ruby?

I'll admit that I'm a bit of a ruby newbie (writing rake scripts, now). In most languages, copy constructors are easy to find. Half an hour of searching didn't find it in ruby. I want to create a copy of the hash so that I can modify it without affecting the original instance. ...
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How to replace a hash key with another key

I have a condition where, I get a hash 9 Answers 9 ...
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Is log(n!) = Θ(n·log(n))?

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How to use UIVisualEffectView to Blur Image?

Could someone give a small example of applying the blur to an image? I've been trying to figure out the code for a while now :( still new at obj c! ...
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How can I click a button behind a transparent UIView?

Let's say we have a view controller with one sub view. the subview takes up the center of the screen with 100 px margins on all sides. We then add a bunch of little stuff to click on inside that subview. We are only using the subview to take advantage of the new frame ( x=0, y=0 inside the subview i...