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Writing Domain Specific Languages

Presented at:

  • Functional Swift Conference - Brooklyn, NY 2017
  • Mobiconf - Krakow, Poland 2017

Video

Writing Domain Specific Languages - Functional Swift 2017

Writing Domain Specific Languages - Functional Swift 2017

Abstract

A Domain Specific Language (DSL) is a computer programming language of limited expressiveness focused on a particular domain. Most languages you hear of are General Purpose Languages, which can handle most things you run into during a software project. Each DSL can only handle one specific aspect of a system.

Domain specific languages allow us to create an ideal environment for solving a specific problem. In this talk we’ll discuss how to use various language features like recursive enums, trailing closures and higher order functions to create elegant and type-safe domain specific languages.

We will go through real-world problems we encountered at Pinterest and will end by building a domain specific language for crafting type-safe GraphQL queries using the Github API.

Playground

The examples I covered in the presentation are all available as pages in the WritingDSLs playground.

Contents

  • Page 1: File Hierarchies
  • Page 2: Code Generation
  • Page 3: GraphQL queries with Github

Note: The GraphQL playground requires you to create your own access token for Github https://developer.github.com/early-access/graphql/guides/accessing-graphql/

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