July 2018
Intermediate
186 pages
3h 24m
English
Content preview from Professional ScalaBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Language Features for Writing DSLs
In this section, we'll look at the Scala features that make it easy to write small DSLs:
- Flexible syntax for method invocation
- By-name parameters
- Extension methods and
Valueclasses
We'll use all of these features in the next section when we create our own DSL in Scala.
Flexible Syntax for Method Invocation
Scala has a
flexible syntax for method invocations that makes it possible to, in some
cases, omit the dot (
.) and parentheses (
()) when invoking methods.
The rules are as follows:
- For methods that are of arity-
0, meaning they don't take any parameters, the parentheses can be omitted and you can use the postfix notation. - For methods with an arity of
1or more, meaning they take one or more parameters, it's possible ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.