Boot.dev vs. Codédex vs. JavaScript vs. Unlambda Comparison Chart

Codédex is an online, interactive coding-learning platform that uses a gamified, adventure-style format to teach real programming languages and skills. Learners travel through “fantasy lands” corresponding to languages such as Python, HTML/CSS, JavaScript, React, and command-line tools (Git, GitHub), proceeding at their own pace while earning experience points, badges, and unlocking new regions as they progress. It combines bite-sized interactive lessons, an in-browser code editor for instant practice, and project-based tutorials to give users hands-on experience rather than just theory. With more than 200 hours of content, Codédex supports beginners with no prior coding experience and gradually builds up to more advanced topics, reinforcing learning through code challenges, exercises, and real-world projects. It fosters a supportive community through forums and events like monthly challenges and hackathons, helping motivate learners and provide peer support.

Unlambda is a programming language. Nothing remarkable there. The originality of Unlambda is that it stands as the unexpected intersection of two marginal families of languages. Functional programming languages, of which the canonical representative is Scheme (a Lisp dialect). This means that the basic object manipulated by the language (and indeed the only one as far as Unlambda is concerned) is the function. Rather, Unlambda uses a functional approach to programming: the only form of objects it manipulates are functions. Each function takes a function as an argument and returns a function. Apart from a binary “apply” operation, Unlambda provides several built-in functions (the most important ones being the K and S combinators). User-defined functions can be created, but not saved or named, because Unlambda does not have any variables.