In the typical C-like case statement you’re limited to matching against values of ordinal types and triggering trivial expressions for matches. This page shows examples of the Scala 'match' expression, including how to write match/case expressions. Using a match expression to yield a result like this is a common use.. Aside: A quick look at Scala methods. In our previous Scala Tutorial, we studied Scala Trait Mixins and today we will see what is Scala Pattern Matching with examples. The value of the float variable is 12.456000, while the value of the integer variable is 2000, and the string is Hello, Scala! Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. This is an excerpt from the Scala Cookbook (partially modified for the internet). Scala also makes it easy to use a match expression as the body of a method. Essentially, it compares an input with all the possible cases we want to match it with. Moreover, we will discuss the types of pattern matching in Scala Programming Langauge.At last, we will discuss pattern matching with example & syntax and Scala Pattern Matching Case … Using them, you can take advantage of several concise idioms not normally available in object-oriented languages. You can add if conditions to matches like this:. This is Recipe 3.7, “How to use a Scala match expression like a switch statement.” Problem. ls match { case x if x.contains("foo") => // FOO case x if x.contains("bar") => // BAR case _ => // ELSE } However, it is not the nicest way, as each if check needs to traverse the list, so this doesn't scale well. The toInt example shows how to declare a method that returns an Option.As a consumer of a method that returns an Option, there are several good ways to call it and access its result:. () String Interpolation. String Interpolation is the new way to create Strings in Scala programming language. Getting the value from an Option. https://www.journaldev.com/7830/scala-pattern-matching-with-case-statement At first glance, pattern-matching expressions look like the familiar case statements from your favorite C-like language. Chapter 4. Use getOrElse; Use foreach; Use a match expression; To get the actual value if the method succeeds, or use a default value if the method fails, use getOrElse: Teams. You have a situation in your Scala code where you want to create something like a simple Java integer-based switch statement, such as matching the days in a week, months in a year, and other situations where an … A successful match can also deconstruct a value into its constituent parts. Overview. We haven’t shown how to write Scala methods yet, so as a brief introduction, here’s a method named convertBooleanToStringMessage that takes a Boolean value and returns a String: For example, “In the case that i is 5, print a message; in the case that i is 6, exit the program.” It is similar to when statement in Kotlin and switch statement in Java.. Pattern matching is one of the most powerful tools that the Scala language has to offer. Introduction ... (bool: Boolean): String = bool match { case true => "you said true" case false => "you said false"} The body of that method is just two case statements, one that matches true and another that matches false. In this chapter, you learned about Scala's case classes and pattern matching in detail. Q&A for Work. Pattern Matching. This feature supports the versions of Scala-2.10 and later. 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