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Allowing < and > in method names is why Scala doesn’t follow Java’s convention for angle brackets. The body of the upper method comes after the equals sign (=). Why an equals sign? }), like in Java? Because semicolons, function return types, method arguments lists, and even the curly braces are sometimes omitted, using an equals sign prevents several possible parsing ambiguities. Using an equals sign also reminds us that even functions are values in Scala, which is consistent with Scala’s support of functional programming, described in more detail in Chapter 8.

In the following examples, we’ll describe just enough of the details so you understand what’s going on. The goal is to give you a sense of what programming in Scala is like. We’ll explore the details of the features in subsequent chapters. ” Let’s start with the interactive mode. Start the scala interpreter by typing scala and the return key on your command line. You’ll see the following output. ). Type in expressions to have them evaluated. Type :help for more information. scala> The last line is the prompt that is waiting for your input.

Scala // ERROR: Won't compile until you put a String return type on upCase. toUpperCase() } println( upCase("") ) println( upCase("Hello") ) Running this script gives you the following error: ... 6: error: method upCase has return statement; needs result type return s ^ You can fix this error by changing the first line of the method to the following: def upCase(s: String): String = { Actually, for this particular script, an alternative fix is to remove the return keyword from the line. It is not needed for the code to work properly, but it illustrates our point.

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An introduction to categories in computing by Jay C.B.

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