Clojure vs. Crystal vs. Eiffel vs. Python Comparison Chart

Clojure is a robust, practical, and fast programming language with a set of useful features that together form a simple, coherent, and powerful tool. Clojure is a dynamic, general-purpose programming language, combining the approachability and interactive development of a scripting language with an efficient and robust infrastructure for multithreaded programming. Clojure is a compiled language, yet remains completely dynamic, every feature supported by Clojure is supported at runtime. Clojure provides easy access to the Java frameworks, with optional type hints and type inference, to ensure that calls to Java can avoid reflection. Clojure is a dialect of Lisp, and shares with Lisp the code-as-data philosophy and a powerful macro system. Clojure is predominantly a functional programming language and features a rich set of immutable, persistent data structures. When a mutable state is needed, Clojure offers a software transactional memory system and reactive Agent system.

Eiffel is the most comprehensive approach to the construction of successful object-oriented software. You spend less on development, debugging, and maintenance. You get the bugs before they get you. You release quality products ahead of your competitors. Easier in every way, understanding, maintenance, reuse, and extension. Eiffel is the only approach that covers analysis, design, implementation, and maintenance in a single framework. Systems developed using Eiffel can be made portable across major industry platforms. Based on a small number of powerful ideas from computer science and software engineering. Products of all phases are recorded in a single document with multiple views. Exists to express the products of the Eiffel Method. Supports features not always available in competing technologies. Exception handling based on software specification (versus ad hoc try/catch). Widely recognized as simultaneously the simplest and most complete implementation of object-oriented concepts.