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Beginner Clojure: An Eric Normand Signature Course

A map of the Repl-Driven Development territory

Course: Repl-Driven Development in Clojure

Updated August 9, 2020

We take a look at an idealized model of the development process so that we can understand all of the places where we can make tools and practices to improve our development workflow.

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43 min Free

Example of Repl-Driven Development

This lesson shows an in-depth example of repl-driven development. We start a new project to parse and analyze an unknown CSV file. By taking small steps at the REPL, we develop a program to parse the CSV. We test each step at the repl before moving on, and interactively expand the program. At the end, we have a program to parse it, and we have tested everything carefully along the way.

Course: Repl-Driven Development in Clojure

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Lessons

What is Repl-Driven Development?

The mental switch to Repl-Driven Development - Batch vs interactive programming

A map of the Repl-Driven Development territory

Example of Repl-Driven Development

Clojure execution semantics

Compiling and executing code from your Clojure editor

Starting a Basic REPL Workflow

Coding interactively at the Repl

Guidelines for Repl-Driven Development

Ergonomics - Tools to write code

Structural editing - Tools to write code

Testing code with the Repl

Dealing with errors

println debugging

Scientific debugging

Keeping code in sync

Controlling namespace reloading with defonce

Printing values and controlling printing

Playing with values at the repl

Navigating namespaces at the repl

Interactive documentation

Running a Clojure repl in a Java application

Editing servers and other long-running processes

Some reloading tools some people use

Recap and Conclusions