![]() For example, in Java syntax: CarBuilder carBuilder = new CarBuilder() Car and defines a matching CarBuilder class that you can use to build a Car. The intent of the Builder design pattern is to separate the construction of a complex object from its representation. Instead I will bring up just a few to highlight how those design patterns change when applied to Scala, or if they apply at all. There are too many design patterns to discuss them all in this post. Some of these patterns are broadly applicable to most large codebases, while others are specialized and only relevant within a particular field. There are many other books discussing design patterns, and countless other patterns have been described and analysed. The Design Patterns book describes a dozen or two different patterns: No matter how many features a language has or how flexible they are, they will never be able to satisfy the ever-growing set of things that people will want to do with a programming language! As programming languages gets more flexible and powerful, people will use them for ever more complex things, and there will be always be "missing language features" at the margin. Some say that design patterns are missing language features: this may be true, but that fact is uninteresting. For example, "This is a builder object" tells you what it's for much faster and more effectively than reading through dozens of method signatures or hundreds of lines of code. Knowing these patterns helps you quickly identify common techniques in other peoples' code, provides a toolbox of common ways you can approach common problems, and provides a common vocabulary to explain or discuss implementations (real or imagined) with other developers. However, that doesn't mean design patterns are without value. If the "commonality" is concrete enough to make into a helper method, then you make it into a helper method and it is no longer called a design pattern! Hence the idea of "design patterns" will always have a bit of vagueness to it. Implementing a design pattern isn't as simple as using a language feature, calling a method or instantiating a class rather than concrete code, a design pattern is a high-level sketch of a solution, and you still have to write all the code yourself in order to make something useful. If you enjoyed the contents on this blog, you may also enjoy Haoyi's book Hands-on Scala ProgrammingĪ "Design Pattern" is a common solution to a common problem that isn't concrete enough to be packaged up as a helper method, class or module. This post will explore how some of these old design patterns apply to the Scala programming language.Ībout the Author: Haoyi is a software engineer, and the author of many open-source Scala tools such as the Ammonite REPL and the Mill Build Tool. While some of the traditional design patterns still apply, others have changed significantly, and yet others have been entirely superseded by new language features. The Scala programming language in 2016 is different from languages common 22 years ago. The "Gang of Four" Design Patterns book popularized the idea, and discussed in detail many of the design patterns which are common in C++, Java and similar "Object Oriented" languages. Benchmarking Scala Collections Implicit Design Patterns in ScalaĪ Design Pattern is something you do over and over when building software, but isn't concrete enough to be made into a helper method, class or other abstraction.
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