Scala is an interesting language and a multi-paradigm programming language. The original intention of its design is to integrate various features of object-oriented programming and functional programming. Scala runs on the JVM, is compatible with existing Java programs, integrates various features of object-oriented programming and functional programming, and easily realizes interconnection with a rich Java class library. Scala is also a functional language, and its functions can also be used as values. Scala provides a lightweight syntax for defining anonymous functions, supports higher-order functions, allows nesting of multiple functions, and supports currying. Scala's case class and its built-in pattern matching are equivalent to algebraic types commonly used in functional programming languages.
advantage
Elegance and high speed
This is the first question for framework designers to consider. The users of the framework are application development programmers. Whether the API is elegant or not directly affects the user experience. Scala language has strong expressive ability, one line of code is worth multiple lines of Java, and the development speed is fast; Scala is statically compiled, so it is much faster than JRuby and Groovy.
FP generic support
If you use a lot of template interfaces in Spring, you will feel that FP is actually quite easy to use. And this is just the tip of the iceberg of FP's benefits. A function is actually an input-"output (scala also expresses a function in this way). It has no side effects and has nothing to do with state. Because of this feature, the functional programming paradigm has many benefits in the distributed field. For functional programming, I The knowledge of FP is really trivial, but it can be said that what are the advantages of FP relative to OO, and what are the advantages of Scala over Java. It is precisely because FP has so many advantages that Java 8 introduced FP. To a certain extent, Java recognizes Scala's approach.
Scala also contains several key concepts of functional languages, including Higher-Order Function, Currying, Nested FuncTIon, Sequence Comprehensions, etc. Scala is statically typed, which allows it to provide generic classes, inner classes, and even polymorphic methods. It is also worth mentioning that Scala is specifically designed to be interoperable with Java and .NET.
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