Effective Scala Marius Eriksen, Twitter Inc. Introduction Scala is one of the main application programming languages used at Twitter. Much of our infrastructure is written in Scala and early closure binary options brokers have several large libraries supporting our use.
While highly effective, Scala is also a large language, and our experiences have taught us to practice great care in its application. Which features do we embrace, which do we eschew? Scala provides many tools that enable succinct expression. Less typing is less reading, and less reading is often faster reading, and thus brevity enhances clarity.
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However brevity is a blunt tool that can also deliver the opposite effect: After correctness, think always of the reader. Scala program is unlike one written in any of these. In order to use the language effectively, you must phrase your problems in its terms. There’s no use coercing a Java program into Scala, for it will be inferior in most ways to its original. Above all, be always aware of the trade offs you make. Formatting The specifics of code formatting — so long as they are practical — are of little consequence. By definition style cannot be inherently good or bad and almost everybody differs in personal preference.
However the consistent application of the same formatting rules will almost always enhance readability. This is of particular importance to Scala, as its grammar has a high degree of overlap. Furthermore, the different styles of method invocations expose different ambiguities in its grammar! We adhere to the Scala style guide plus the following rules. Try to avoid lines greater than 100 columns in length. Use one blank line between method, class, and object definitions.
Use longer names for larger scopes External APIs should have longer and explanatory names that confer meaning. Use braces when importing several names from a package import com. Use wildcards when more than six names are imported e.
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