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Importing Stuff
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The import scala.io._ code imports all the classes from the scala.io package. This is the same as Java s import scala.io.*;. Scala uses the _ rather than the * as a wildcard. Coming from Javaland, it takes a little getting used to, but it ll soon make sense.
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Parsing a String to an Int
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Next, we define the toInt method, which takes a single parameter called in. That parameter has the type String:
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def toInt(in: String): Option[Int] =
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In Scala, method definitions begin with the def keyword. The method name follows, along with the method s parameter list. In this case, the toInt method takes one parameter: in, whose type declaration follows it rather than precedes it. In some cases, the Scala compiler can figure out or infer the type of a variable or the return type of a method. You need to declare the parameter types for a Scala method, but we may omit the return type if the
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CHAPTER 2 SCALA SYNTAX, SCRIPTS, AND YOUR FIRST SCALA PROGRAMS
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return type can be inferred and the method is not recursive.2 We declare the return type as Option[Int]. In general, if the return type is not immediately obvious, it s an act of kindness and good citizenship to your fellow programmers and your future self to declare the return type. What s Option and what are those funky square brackets around Int Option is a container that holds one or zero things. If it holds zero elements, it s None, which is a singleton, which means that only one instance of None. If the Option holds one element, it s Some(theElement). The funky square brackets denote the type of thing that s held by the Option. In this case, the Option holds an Int. In Scala, everything is an instance of a class, even Int, Char, Boolean, and the other JVM primitive types. The Scala compiler puts primitive types in instance boxes (boxing) only when necessary. The result is that you can treat all classes uniformly in Scala, but if your primitive data does not require boxing, you ll see the same program performance you see using primitives in Java. If your primitive does require boxing, the Scala compiler does all the boxing and unboxing for you, and it even does null testing when it unboxes nice and polite. So, Option[Int] is a container that holds zero or one Int value.3 Using Option is one of the ways that Scala lets you avoid null pointer exceptions and explicit null testing. How You can apply your business logic over all the elements in the Option. If the Option is None, then you apply your logic over zero elements. If the Option is Some, then you apply your business logic over one element. Option can be used and nested in the for comprehension. We ll explore Option in more depth in 3. When I m writing code, I return Option from any method that, based on business logic, might return some value or might return none. In this case, converting a String to an Int might succeed if the String can be parsed or might fail if the String cannot be parsed into an Int. If the String cannot be parsed, it is not something that s worthy of an exception because it s not an exceptional situation. It is merely a calculation that has no legal value, thus it makes sense to return None if the String cannot be parsed. This mechanism also avoids the Java patchwork of sometimes returning null when there s no legal value to return and sometimes throwing an exception. Speaking of exceptions, that s exactly what Integer.parseInt does when it cannot parse the String into an Int. So, in our code, we wrap a try/catch around Some(Integer.parseInt(in.trim)). If the Integer.parseInt method succeeds, a new instance of Some will be created and returned from the toInt method. There s no explicit return statement as the last expression evaluated in the method is its return value.
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2. A recursive method is a method that calls itself. 3. Option[Int] is a variant type or sum type with None as one variant and Some[Int] as the other. Neither None nor Some[Int] is the same as Int, but if you re working with an Option[Int] that happens to be of the variant Some[Int] then you can extract the actual Int from it by calling the get method.
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