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What makes Lisp macros so special?

.... Let's invoke our suspension of disbelief and pretend Lisp has a very limited loop macro that just does iteration and no easy way to do the equivalent of list comprehensions. In Lisp you could write the following. I should note this contrived example is picked to be identical to the Python co...
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Why is null an object and what's the difference between null and undefined?

... I don't know. In short; undefined is where no notion of the thing exists; it has no type, and it's never been referenced before in that scope; null is where the thing is known to exist, but it's not known what the value is. One thing to remember is that null is not, conceptually, the same as false ...
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Is it possible to set a custom font for entire of application?

... certain font for my entire application. I have .ttf file for the same. Is it possible to set this as default font, at application start up and then use it elsewhere in the application? When set, how do I use it in my layout XMLs? ...
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When should we use Observer and Observable?

... example of a Student and a MessageBoard. The Student registers by adding itself to the list of Observers that want to be notified when a new Message is posted to the MessageBoard. When a Message is added to the MessageBoard, it iterates over its list of Observers and notifies them that the event ...
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Going from a framework to no-framework [closed]

...eveloping in PHP for about 8 years as a hobby. In 2009, I picked up codeigniter and since then I've not managed to get a single project developed. ...
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GoogleTest: How to skip a test?

...n test that you cannot fix right away, you can add the DISABLED_ prefix to its name. This will exclude it from execution." Examples: // Tests that Foo does Abc. TEST(FooTest, DISABLED_DoesAbc) { ... } class DISABLED_BarTest : public ::testing::Test { ... }; // Tests that Bar does Xyz. TEST_F(DIS...
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Why is require_once so bad to use?

...luded/required. Every *_once call means checking that log. So there's definitely some extra work being done there but enough to detriment the speed of the whole app? ... I really doubt it... Not unless you're on really old hardware or doing it a lot. If you are doing thousands of *_once, you coul...
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How serious is this new ASP.NET security vulnerability and how can I workaround it?

I've just read on the net about a newly discovered security vulnerability in ASP.NET. You can read the details here. 10 An...
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Multiline string literal in C#

Is there an easy way to create a multiline string literal in C#? 13 Answers 13 ...
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C# “internal” access modifier when doing unit testing

I'm new to unit testing and I'm trying to figure out if I should start using more of internal access modifier. I know that if we use internal and set the assembly variable InternalsVisibleTo , we can test functions that we don't want to declare public from the testing project. This makes me thi...