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Applied Functional Programming with Scala - Notes

Copyright © 2016-2018 Fantasyland Institute of Learning. All rights reserved.

1. Mastering Functions

A function is a mapping from one set, called a domain, to another set, called the codomain. A function associates every element in the domain with exactly one element in the codomain. In Scala, both domain and codomain are types.

val square : Int => Int = x => x * x

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Some Jenkinsfile examples

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export interface None {
  readonly _tag: "None"
}

export interface Some<A> {
  readonly _tag: "Some"
  readonly value: A
}

export type Option<A> = None | Some<A>