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What is a sealed trait?
Sealed classes are described in 'Programming in Scala', but sealed traits are not.
Where can I find more information about a sealed trait?
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How do I create a unique ID in Java? [duplicate]
I'm looking for the best way to create a unique ID as a String in Java.
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Count how many files in directory PHP
I'm working on a slightly new project. I wanted to know how many files are in a certain directory.
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Ruby function to remove all white spaces?
What is the Ruby function to remove all white spaces? I'm looking for something kind of like PHP's trim() ?
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How to do multiple arguments to map function where one remains the same in python?
Lets say we have a function add as follows
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How to refresh app upon shaking the device?
I need to add a shake feature that will refresh my Android application.
16 Answers
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Floating View 扩展：悬浮视图扩展，将组件转换为悬浮窗口 · App Inventor 2 中文网
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Android View shadow
I searched around, and I could not find a proper way to do this. I want to have the following shadow effects on my views:
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How can I select from list of values in SQL Server
I have very simple problem that I can't solve. I need to do something like this:
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Adding two numbers concatenates them instead of calculating the sum
I am adding two numbers, but I don't get a correct value.
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