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How to pattern match using regular expression in Scala?
...Regex(sc.parts.mkString, sc.parts.tail.map(_ => "x"): _*)
}
scala> "123" match { case r"\d+" => true case _ => false }
res34: Boolean = true
Even better one can bind regular expression groups:
scala> "123" match { case r"(\d+)$d" => d.toInt case _ => 0 }
res36: Int = 123
sc...
How to pass a variable from Activity to Fragment, and pass it back?
... the method onCreate or onCreateView of your fragment.
On the newInstance function of your fragment you add the arguments you wanna send to it:
/**
* Create a new instance of DetailsFragment, initialized to
* show the text at 'index'.
*/
public static DetailsFragment newInstance(int index) {
...
Connecting overloaded signals and slots in Qt 5
... getting to grips with the new signal/slot syntax (using pointer to member function) in Qt 5, as described in New Signal Slot Syntax . I tried changing this:
...
MQTT与TCP的区别 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...地球战略的组成部分。
侵删，来源：https://blog.sciencenet.cn/blog-858128-1286181.html
How do I find the location of my Python site-packages directory?
How do I find the location of my site-packages directory?
21 Answers
21
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Is REST DELETE really idempotent?
...ot all-effects or responses. If you do a DELETE http://example.com/account/123 then the effect is that account 123 is now deleted from the server. That is the one and only effect, the one and only change to the state of the server. Now lets say you do the same DELETE http://example.com/account/123 ...
Fit Image in ImageButton in Android
....let { retrieveAttributes(it) }
}
/**
*
*/
override fun onLayout(changed: Boolean, left: Int, top: Int, right: Int, bottom: Int) {
val width = right - left
val height = bottom - top
val horizontalPadding = if(width > iconWidth) (width - iconWidth) /...
What is the purpose of a stack? Why do we need it?
...ters, thus greatly improving execution speed. A Dalvik jitter has the opposite problem.
The machine stack is otherwise a very basic storage facility that has been around in processor designs for a very long time. It has very good locality of reference, a very important feature on modern CPUs that...
Any way to declare an array in-line?
...rray = {1, 2, 3};
If you have to inline, you'll need to declare the type:
functionCall(new String[]{"blah", "hey", "yo"});
or use varargs (variable arguments)
void functionCall(String...stringArray) {
// Becomes a String[] containing any number of items or empty
}
functionCall("blah", "hey", ...
java.util.regex - importance of Pattern.compile()?
...ch is really called a lot :)
public class AmountValidator {
//Accept 123 - 123,456 - 123,345.34
private static final String AMOUNT_REGEX="\\d{1,3}(,\\d{3})*(\\.\\d{1,4})?|\\.\\d{1,4}";
//Compile and save the pattern
private static final Pattern AMOUNT_PATTERN = Pattern.compile(AM...