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This article mainly introduces "what is the functional style of Scala". In daily operation, I believe many people have doubts about the functional style of Scala. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful for you to answer the doubts of "what is the functional style of Scala?" Next, please follow the editor to study!

If you come from an imperative background, such as Java,C++, or clips, you may think that var is a very orthodox variable and val is a special type of variable. Conversely, if you come from a functional background, such as Haskell,OCamel, or Erlang, you may think that val is an orthodox variable and var has a blasphemous pedigree. To Scala, however, val and var are just two different tools in your toolbox. They are all useful, and none of them are born demons. Scala encourages you to learn val, but doesn't blame you for choosing the most effective tool for a given job. Although you may agree with this philosophy of balance, you may still find it challenging to understand how to remove var from your code.

Consider the following example of a while loop adapted from Chapter 2, which uses var and is therefore imperative:

Def printArgs (args: Array [String]): Unit = {var I = 0 while (I < args.length) {println (args (I)) I + = 1}}

You can make this code more functional by removing var, for example, like this:

Def printArgs (args: Array [String]): Unit = {for (arg)

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