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How do I convert NSMutableArray to NSArray?
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NSArray *array = [mutableArray copy];
Copy makes immutable copies. This is quite useful because Apple can make various optimizations. For example sending copy to a immutable array only retains the object and returns self.
If you don't use garbage collection or ARC remember that -copy retains ...
Difference Between ViewResult() and ActionResult()
What is the difference between ViewResult() and ActionResult() in ASP.NET MVC?
8 Answers
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How do I break out of a loop in Scala?
...ns to break out of loops.
Suppose you want to sum numbers until the total is greater than 1000. You try
var sum = 0
for (i <- 0 to 1000) sum += i
except you want to stop when (sum > 1000).
What to do? There are several options.
(1a) Use some construct that includes a conditional that y...
Why can't overriding methods throw exceptions broader than the overridden method?
I was going through SCJP 6 book by Kathe sierra and came across this explanations of throwing exceptions in overridden method. I quite didn't get it. Can any one explain it to me ?
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How to Deep clone in javascript
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It really depends what you would like to clone. Is this a truly JSON object or just any object in JavaScript? If you would like to do any clone, it might get you into some trouble. Which trouble? I will explain it below, but first, a code example which clones object litera...
When to catch java.lang.Error?
... sometimes you need to catch specific errors.
If you're writing framework-ish code (loading 3rd party classes), it might be wise to catch LinkageError (no class def found, unsatisfied link, incompatible class change).
I've also seen some stupid 3rd-party code throwing subclasses of Error, so you'...
Is there a simple, elegant way to define singletons? [duplicate]
There seem to be many ways to define singletons in Python. Is there a consensus opinion on Stack Overflow?
21 Answers
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#if DEBUG vs. Conditional(“DEBUG”)
Which is better to use, and why, on a large project:
8 Answers
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Advantages of using prototype, vs defining methods straight in the constructor? [duplicate]
... -> 3, 3
Notice how changing the method applied to both instances? This is because ins1 and ins2 share the same calc() function. In order to do this with public methods created during construction, you'd have to assign the new method to each instance that has been created, which is an awkward...
stringstream, string, and char* conversion confusion
...ng from that (stringstream.str().c_str()), it will point to a string which is deleted where the statement ends. That's why your code prints garbage.
You could copy that temporary string object to some other string object and take the C string from that one:
const std::string tmp = stringstream...