Clojure
ver. 1.0.0
A practical, REPL-driven course on Clojure covering its Lisp identity, immutable data and concurrency model, core mechanics, functions/closures, and macro programming from basics to DSLs
A compact, hands-on guide to Clojure that makes you comfortable with Lisp syntax and REPL-driven development, teaches core types, collections and functional idioms, explains Clojure’s approach to state and concurrency (immutable values vs mutable identities and the four reference types), and develops macro skills from safe-writing to advanced DSL and compile-time techniques. Along the way you learn practical mechanics—namespaces, metadata, destructuring, reader literals, Java interop—and how to use functions and closures for abstraction or lightweight object-like patterns.
This unit bundle is a practical, progressive introduction to Clojure that combines language identity, day-to-day workflow, core semantics, concurrency design, and macro-based abstraction.
- Clojure identity and mindset
- Presents Clojure as a modern Lisp on the JVM with a functional core built on persistent immutable data and structural sharing.
- Emphasizes the distinction between values and identities and how that distinction shapes program structure, reasoning and concurrency.
- REPL-driven development and core mechanics
- Teaches REPL-first workflows and tooling, reading and writing prefix (S-expression) syntax, and using Java interoperability and JVM threading.
- Covers core scalar types and the numeric tower, symbols vs keywords, and the primary collection types (lists, vectors, maps, sets) plus the ISeq abstraction.
- Explains metadata, reader literals, namespaces, destructuring, exception handling, and organizing code.
- Functions, control flow, and abstractions
- Demonstrates defining functions (multiple arities, variadic forms), higher-order patterns, partial application, composition, and common sequence operations (map, reduce, filter).
- Replaces imperative loops with recur and sequence-oriented iteration, uses threading macros to improve readability, and shows how closures implement control structures or message-passing objects while contrasting them with Clojure’s data-oriented style.
- Concurrency and managed references
- Gives a principled account of concurrency: why shared mutable state is problematic and how Clojure separates immutable values from mutable identities.
- Teaches the four managed reference types—refs (with STM/MVCC and transactions), agents, atoms, and dynamic vars—plus futures and promises, so you can pick the right primitive and structure synchronous or asynchronous change safely.
- Macros: from basics to advanced DSLs
- Explains macro expansion phases (read → macroexpand → compile → run), how macros run at compile time, and why Lisp’s homoiconicity makes macros natural.
- Teaches safe macro writing using syntax-quote/unquote/unquote-splicing, auto-gensym, hygiene concerns, and when macros are necessary versus preferring functions.
- Advances to anaphoric macros, macros that introduce bindings or perform compile-time work, macro-generating macros, and techniques for moving computation earlier to improve runtime performance.
- Applies these techniques to design and implement a small domain-specific language, and provides guidance for when building a DSL is justified.
Outcomes - Read and write idiomatic Clojure code, navigate the REPL, and interoperate with Java. - Use Clojure’s core types, sequence abstractions and functional patterns to build concise, expressive programs. - Apply the correct concurrency primitive to real problems and reason about safety and identity. - Write, inspect and reason about macros—both simple control-flow macros and advanced compile-time abstractions including DSLs—while preferring functions where appropriate.
This synthesis prepares you to be productive in Clojure, from everyday programming and concurrency to powerful metaprogramming that raises abstraction and moves computation earlier in the pipeline.
Units
Introducing Clojure 3/4
Learn Clojure’s identity as a modern Lisp, its functional core with persistent immutable data, and how it uses the JVM for interop and concurrency
Clojure Elements: Data Structures and Functions 3/4
Practical Clojure fundamentals: REPL-driven development, core types and collections, function and control-flow forms, recursion and sequence-oriented iteration
Building Blocks of Clojure 3/4
Practical Clojure mechanics: metadata, functions, scope, namespaces, destructuring and reader literals
State and the Concurrent World 3/4
How Clojure solves concurrency by separating immutable values from mutable identities and offering four managed reference types plus futures/promises.
Evolving Clojure Through Macros 3/4
Learn how Clojure macros operate, how to write them safely, and when to prefer functions.
More on Functional Programming 3/4
How functions (and closures) provide abstraction, control and even objects
More Macros and DSLs 3/4
Advanced macro techniques: anaphora, compile-time work, macro-generating macros, and building DSLs to raise abstraction and move computation earlier