Schedule: Functional Programming (Elm, ClojureScript, Erlang) sessions

From callbacks to promises to generators to async/await, JavaScript has a myriad of ways to handle out-of-order events and processes—some of which are more readable than others and some of which are more testable than others. Nicole Chung explores the readability and testability of each approach in detail. Read more.

Elm is a functional programming language that compiles to JavaScript and allows building robust and safe web apps. Jeremy Fairbank dives into Elm's syntax and its Model-View-Update architecture, explaining the advantages Elm offers for developing frontend apps and how to structure a simple app with pure functions, and shares steps to getting started with Elm. Read more.

Functional programming—programming without side effects or mutability—has great advantages, especially for JavaScript developers, but never mutating data can lead to efficiency problems. Anjana Vakil explains how immutable data structures provide an elegant solution and explores two libraries that make it easy to use these remarkable data structures in your own JavaScript projects. Read more.

J. David Eisenberg offers a whirlwind tour of ClojureScript, a functional language that compiles to JavaScript, covering everything from basic syntax, variables, and function definitions to lists, vectors, and the map and reduce functions. Read more.