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How can two strings be concatenated?
...("Hello", "world", sep=" ")
[1] "Hello world"
where the argument sep specifies the character(s) to be used between the arguments to concatenate,
or collapse character vectors
> x <- c("Hello", "World")
> x
[1] "Hello" "World"
> paste(x, collapse="--")
[1] "Hello--World"
where the ar...
How to use NSJSONSerialization
...ectWithData: data options: NSJSONReadingMutableContainers error: &e];
if (!jsonArray) {
NSLog(@"Error parsing JSON: %@", e);
} else {
for(NSDictionary *item in jsonArray) {
NSLog(@"Item: %@", item);
}
}
s...
Flatten List in LINQ
...have expected the language designers to come up with a shortcut syntax specifically for lists of lists
– Andy
Feb 9 '17 at 12:15
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Bold words in a string of strings.xml in Android
...else who found the official Android documentation a bit too vague on this: if you use tags like <b> in your string resource, make sure you retrieve it using getText(R.string.whatever) rather than getString(R.string.whatever)
– andygeers
Jun 9 '15 at 12:15...
How to get the jQuery $.ajax error response text?
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Using an eval here doesn't make much sense. If you want to parse a JSON response, use JSON.parse. In the OP's case, the response isn't even JSON or JavaScript, so your eval is just going to cause a SyntaxError.
– Mark Amery
Mar 27...
How to access array elements in a Django template?
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Remember that the dot notation in a Django template is used for four different notations in Python. In a template, foo.bar can mean any of:
foo[bar] # dictionary lookup
foo.bar # attribute lookup
foo.bar() # method call
foo[bar] # list-index lookup
It tries them in t...
Is it possible to await an event instead of another async method?
... @DanielHilgarth No, you couldn't. async doesn't mean “runs on a different thread”, or something like that. It just means “you can use await in this method”. And in this case, blocking inside GetResults() would actually block the UI thread.
– svick
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Is it possible to program iPhone in C++
...se Objective-C++, which you can read about at Apple Developer Connection.
If you know C++ already, learning Objective-C would be pretty simple, if you decided to give that a try. More info on that topic is at the ADC as well.
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What's with 181783497276652981 and 8682522807148012 in Random (Java 7)?
...y number would be equally "good". So, no.
Seeding Strategies
There are differences in the default-seeding schema between different versions and implementation of the JRE.
public Random() { this(System.currentTimeMillis()); }
public Random() { this(++seedUniquifier + System.nanoTime()); }...
What is the Objective-C equivalent for “toString()”, for use with NSLog?
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Note if you're using CoreData, the description property is reserved ...and will provide useful debugging information! In that case you'll need to come up with your own unique method name.
– Nuthatch
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