Scala pattern matchingis a commonly used feature which has huge support by Scala language.Pattern matching in Scalais the same as the switch in Java or another programming language. Matching a pattern contains a sequence of alternative of the pattern to be considered. Each sequence is a case of...
再者,scala还支持模式匹配类,即在正常class定义中加入关键字case, 看下面的例子: 1object Test {2def main(args: Array[String]) {3val alice =newPerson("Alice", 25)4val bob =newPerson("Bob", 32)5val charlie =newPerson("Charlie", 32)67for(person <-List(alice, bob, charlie)) {8person ...
在函数值和闭包之后,模式匹配是Scala中使用次数最多的第二个特性。 Scala在处理消息时为模式匹配提供了很好的支持。 模式匹配包括一系列备选方案,每个备选方案都以关键字case开头。 每个替代方案都包括一个pattern和一个或多个expressions,如果模式匹配,将对其进行评估。 箭头符号=“将模式与表达式分开。 请尝试以下示...
2) The last case in Scala assigns the default value to the variable n.Pattern matching in Scala is also an expression that returns a value. 3)In Scala, we can have multiple tests on a single line: case0| -1| -2=>0# responds javacase0:case-1:case-2: return0; Scala allows guards...
rubyregexpattern-matching Mhm*_*hmd lucky-day 0 推荐指数 1 解决办法 61 查看次数 scala中的模式匹配在def内部工作,否则不起作用 在下面的第一个代码片段中,case语句在函数内定义,它按预期工作. 代码段1 def echoWhatYouGaveMe(x: Any):String= x match {case(a, b) =>s"got $a and $b"case(a...
Scala’s pattern matching provides deep inspection and decomposition of objects in a variety of ways. It’s one of my favorite features in Scala. For your own types, you can follow a protocol that allows you to control the visibility of internal state and how to expose it to users. The ...
Daniel Hinojosa
Scala Learning(1): 使用Pattern Matching表达JSON 这是一个挺能展现Scala编程方式的例子,对正在熟悉Scala这门语言的开发者很有帮助。 Representing JSON 用Scala来表达JSON(Java Script Object Notation)结构, {"firstname":"John","lastname":"Smith","address": {"street":"21 2nd Street","state":"NY",...
2. Pattern matching and return the result What if instead of simply printing the different taste level of a donut, you would like to store it in a variable. Similar to what you've learned inIf And Else ExpressionandFor Comprehension, Scala's pattern matching can return the result...
Learn about pattern matching in Scala, a powerful feature that simplifies coding with its expressive syntax and versatility.