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What are the most interesting equivalences arising from the Curry-Howard Isomorphism?
I came upon the Curry-Howard Isomorphism relatively late in my programming life, and perhaps this contributes to my being utterly fascinated by it. It implies that for every programming concept there exists a precise analogue in formal logic, and vice versa. Here's a "basic" list of such analogies...
Bash: infinite sleep (infinite blocking)
I use startx to start X which will evaluate my .xinitrc . In my .xinitrc I start my window manager using /usr/bin/mywm . Now, if I kill my WM (in order to f.e. test some other WM), X will terminate too because the .xinitrc script reached EOF.
So I added this at the end of my .xinitrc :
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How to call a Parent Class's method from Child Class in Python?
When creating a simple object hierarchy in Python, I'd like to be able to invoke methods of the parent class from a derived class. In Perl and Java, there is a keyword for this ( super ). In Perl, I might do this:
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Unable to find specific subclass of NSManagedObject
I'm working on developing an app with Core Data. When I created an instance using:
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Changing every value in a hash in Ruby
I want to change every value in a hash so as to add '%' before and after the value so
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How to check if activity is in foreground or in visible background?
I have a splash screen on a timer. My problem is that before I finish() my activity I need to check that the next activity has started because a system dialogue box pops-up and I only want to finish() ; once the user has selected an option from the dialogue box?
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What strategies and tools are useful for finding memory leaks in .NET?
...l. It has saved my bacon on at least one occasion.
The GC works very well in .NET IMO, but just like any other language or platform, if you write bad code, bad things happen.
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Swift make method parameter mutable?
How can I deal with this error without creating additional variable?
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How do I run Asynchronous callbacks in Playground
...coa and CocoaTouch methods have completion callbacks implemented as blocks in Objective-C and Closures in Swift. However, when trying these out in Playground, the completion is never called. For example:
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How do I get the path of the current executed file in Python?
...m like a newbie question, but it is not. Some common approaches don't work in all cases:
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