Summary
Scala is expressive and rich with tools that help us to eliminate boilerplates. It allows us to concisely express the intention of programming. Functions help us reuse the common facilities, freeing us from coding them every time.
Pure functions are simpler to reason about, as there are lot less moving parts. We can think of them in terms of referential transparency. Impure functions are hard to reason with. We saw how making things immutable also helps in reducing these moving parts.
Idioms are what make us use a language effectively. This is true for programming languages. Scala is a feature-rich functional programming language. We got a bird's eye view of a few Scala features, such as recursion and functions.
Design patterns are a programmer's ...
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