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What is the purpose of the var keyword and when should I use it (or omit it)?
What exactly is the function of the var keyword in JavaScript, and what is the difference between
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What does “dereferencing” a pointer mean?
Please include an example with the explanation.
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What's the _ underscore representative of in Swift References?
In the reference section of Apple's docs there's lots of instances of this sort of thing:
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Load view from an external xib file in storyboard
I want to use a view throughout multiple viewcontrollers in a storyboard. Thus, I thought about designing the view in an external xib so changes are reflected in every viewcontroller. But how can one load a view from a external xib in a storyboard and is it even possible? If thats not the case, what...
SQL WHERE ID IN (id1, id2, …, idn)
...same but you repeat the column name lots of times; additionally the SQL engine doesn't immediately know that you want to check if the value is one of the values in a fixed list. However, a good SQL engine could optimize it to have equal performance like with IN. There's still the readability issue t...
Should I implement __ne__ in terms of __eq__ in Python?
... the __ne__ method as well, but does it make sense to implement __ne__ in terms of __eq__ as such?
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Why can't I use a list as a dict key in python?
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There's a good article on the topic in the Python wiki: Why Lists Can't Be Dictionary Keys. As explained there:
What would go wrong if you tried to use lists as keys, with the hash as, say, their memory location?
It can be done without really breaking any...
Is VB really case insensitive?
I'm not trying to start an argument here, but for whatever reason, it's typically stated that Visual Basic is case insensitive and C languages aren't (and somehow that is a good thing).
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Function vs. Stored Procedure in SQL Server
I've been learning Functions and Stored Procedure for quite a while but I don't know why and when I should use a function or a stored procedure. They look same to me, maybe because I am kinda newbie about that.
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How to convert strings into integers in Python?
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int() is the Python standard built-in function to convert a string into an integer value. You call it with a string containing a number as the argument, and it returns the number converted to an integer:
print (int("1") + 1)...