If you only change one habit from Java to Clojure, make it this: keep a REPL running and use it constantly. The REPL is not a toy console; it is the main way Clojure developers explore code, validate assumptions, and iterate without long compile-run cycles.
What you should be able to do comfortably
- Start a REPL for a specific project (with the right classpath).
- Connect your editor so you can evaluate forms quickly.
- Load/reload a namespace without restarting the whole JVM.
- Inspect values (including nested maps/vectors) without printing noise.
Java mental model: it is closer to “a live debugger session with a programmable console” than to a script runner.
This section sets up the workflow that makes every later chapter faster and more trustworthy.
In this section
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Understanding the REPL: A Guide for Java Developers Transitioning to Clojure
Explore the Read-Eval-Print Loop (REPL) in Clojure, a powerful tool for interactive development and testing, and learn how it enhances productivity for Java developers transitioning to Clojure.
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Starting the REPL: A Comprehensive Guide for Java Developers Transitioning to Clojure
Learn how to start the Clojure REPL in various environments, including command line and popular IDEs, and understand the differences between standalone and project-connected REPLs.
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Basic REPL Usage
Use the REPL as a real development tool: evaluate forms, inspect values, and require the right helpers instead of guessing.
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Advanced REPL Features for Clojure Developers
Explore advanced REPL capabilities in Clojure, including namespace management, file loading, interrupting evaluations, and using REPL tools for enhanced visualization.
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Integrating the REPL with Your Workflow: Mastering Clojure's Interactive Development
Learn how to effectively integrate the Clojure REPL into your development workflow, enhancing productivity and code quality through interactive programming.