Clojure

These Clojure tutorials are short and practical, which makes them a good second step after learning the syntax at a REPL. Building a Spell-Checker is the gentlest: it builds a small spell checker based on edit distance and shows how far plain functions and sequences go in Clojure. Build a Twitter Bot with Clojure, from the How I Start series, walks through setting up a project and writing a working bot, though Twitter's API access rules have changed a lot since it was written.

Building a JIRA integration with Clojure & Atlassian Connect shows a real web service talking to a third-party API, and Prototyping with Clojure is a GitHub repository that walks through prototyping a web app. Tetris in ClojureScript is an interactive slide deck from the t3tr0s project that builds Tetris in the browser and is a good introduction to ClojureScript's immutable game state.