http://duoduokou.com/scala/36724373330203910508.html WebApr 8, 2024 · Scala中的模式匹配类似于Java中的switch语法模式匹配语法中，采用match关键字声明，每个分支采用case关键字进行声明，当需要匹配时，会从第一个case分支开 …

Pattern Matching in Scala Baeldung on Scala

WebScala 带*（varargs）参数的case类上的模式匹配,scala,pattern-matching,Scala,Pattern Matching,我有两个案例类，如： case class B(value:Int) case class A(a:String, b:B*) extends ALike 我想在一个实例上进行模式匹配： def foo(al:ALike) = { al match { case A(a, bs) => ... http://duoduokou.com/scala/69083787461019127330.html ran oz

Pattern Matching Tour of Scala Scala Documentation

WebScala 提供了强大的模式匹配机制，应用也非常广泛。 一个模式匹配包含了一系列备选项，每个都开始于关键字 case 。 每个备选项都包含了一个模式及一到多个表达式。 箭头符号 => 隔开了模式和表达式。 以下是一个简单的整型值模式匹配实例： 实例 object Test { def main ( args: Array [ String]) { println ( matchTest (3)) } def matchTest ( x: Int): String = x match { … WebDec 25, 2024 · Pattern matching is a powerful feature of the Scala language. It allows for more concise and readable code while at the same time providing the ability to match … Now that you’ve seen an example of a Scala method, here’s a second example that works just like the previous one, taking a Boolean value as an input parameter and returning a String message. The big difference is that this method uses a matchexpression for the body of the method: The body of that … See more Scala also makes it easy to use a match expression as the body of a method. We haven’t shown how to write Scala methods yet, so as a brief introduction, here’s … See more matchexpressions are extremely powerful, and we’ll demonstrate a few other things you can do with them. match expressions let you handle multiple cases in a … See more Another great thing about match expressions is that you can use if expressions in case statements for powerful pattern matching. In this example the second … See more matchexpressions are very powerful, and there are even more things you can do with them, but hopefully these examples provide a good start towards using them. See more ranozine