Eiffel vs. Julia vs. Unlambda vs. python-sql Comparison Chart

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.

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.