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What's the difference between the atomic and nonatomic attributes?
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The last two are identical; "atomic" is the default behavior (note that it is not actually a keyword; it is specified only by the absence of nonatomic -- atomic was added as a keyword in recent versions of llvm/clang).
Assuming that you are @synthesizing the method implementations, atomic vs. no...
How do I create an average from a Ruby array?
...r.inject(0.0) { |sum, el| sum + el } / arr.size
=> 6.5
You can define it as part of Array as another commenter has suggested, but you need to avoid integer division or your results will be wrong. Also, this isn't generally applicable to every possible element type (obviously, an average only ma...
Split string to equal length substrings in Java
How to split the string "Thequickbrownfoxjumps" to substrings of equal size in Java.
Eg. "Thequickbrownfoxjumps" of 4 equal size should give the output.
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What's the difference between equal?, eql?, ===, and ==?
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I'm going to heavily quote the Object documentation here, because I think it has some great explanations. I encourage you to read it, and also the documentation for these methods as they're overridden in other classes, like String.
Side note: if you want to try these out for yourself on different o...
How to change the button text of ?
I tried to modify the value , but it's not working. How to customize the button text?
21 Answers
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Is there a way to measure how sorted a list is?
...nversion of A.
The inversion number of a sequence is one common measure of its sortedness.Formally, the inversion number is defined to be the number of inversions, that is,
To make these definitions clearer, consider the example sequence 9, 5, 7, 6. This sequence has the inversions (0,1), (0,2), (...
Defining a variable with or without export
...ss. You would use this for (say) loop variables, temporary variables etc.
It's important to note that exporting a variable doesn't make it available to parent processes. That is, specifying and exporting a variable in a spawned process doesn't make it available in the process that launched it.
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Block Comments in Clojure
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I hope you're having fun with Clojure. :)
– Rayne
Jul 28 '09 at 2:37
14
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Truncating floats in Python
I want to remove digits from a float to have a fixed number of digits after the dot, like:
29 Answers
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Where does the .gitignore file belong?
Does the .gitignore file belong in the .git folder structure somewhere or in the main source files?
8 Answers
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