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NSUserDefaults - How to tell if a key exists
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I know this is old, but having only just now needed this information, I need to point out that the 'containsObject:' reference means just that: the object. NOT the key. IOW, in your header file if you've defined: #define kMyKey ...
Returning a C string from a function
...ing like "my string" actually uses 9+1 (=10!) bytes. This is important to know when you finally get around to allocating strings dynamically.
So, without this 'terminating zero', you don't have a string. You have an array of characters (also called a buffer) hanging around in memory.
Longevity of ...
sed one-liner to convert all uppercase to lowercase?
...oned, BSD sed doesn't support it). Try reading the top line of man sed to know which version you're using.
– Ryder
Dec 8 '17 at 10:48
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Enable Vim Syntax Highlighting By Default
I know how to turn syntax highlighting on and off in vim by running this in the editor:
6 Answers
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How to dismiss keyboard for UITextView with return key?
...e reason to use UITextView is that it can hold text in multiple lines. And now I'm using it as a message box.
– Chilly Zhong
Apr 1 '09 at 6:12
28
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Direct casting vs 'as' operator?
...n explicitly defined, e.g.: int? i; string s = "5"; i = s as int; // i is now 5 s = null; i = s as int; // i is now null
– Anheledir
Sep 25 '08 at 10:41
3
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What is JSONP, and why was it created?
...omething like this:
mycallback({ foo: 'bar' });
As you can see, it will now invoke the method you specified. So, in your page, you define the callback function:
mycallback = function(data){
alert(data.foo);
};
And now, when the script is loaded, it'll be evaluated, and your function will be ...
Mongodb Explain for Aggregation framework
...gate(
[ ...your pipeline...],
{ explain: true }
)
Thanks to Rafa, I know that it was possible to do even in 2.4, but only through runCommand(). But now you can use aggregate as well.
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Difference between case object and object
...between a standard Scala object and a case object is explained by what we know about the difference between standard classes and case classes. This answer doesn't even address the wording of the question.
– itsbruce
Jan 31 '17 at 13:50
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What is the difference between JavaConverters and JavaConversions in Scala?
...For anyone landing on this question since Scala 2.12.x, JavaConversions is now deprecated and JavaConverters is the preferred method.
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