Every few years, the programming world converges on a handful of languages and treats them as the only serious options.JavaScript, Python, Java, C, and now Rust and Go dominate job listings, tutorials, and conference talks.That consensus is useful, but it also buries languages that solved hard problems elegantly, influenced everything that came after them, and still do useful work today.
Underrated does not mean unknown.It means the gap between a language’s actual quality and the attention it receives is embarrassingly large.These five languages live in that gap.
Perl is never given credit for how much it got right The language that quietly powered the early internet Perl was once the glue of the internet.It parsed logs, generated web pages, connected databases, and handled text better than anything else available.Its regular expression engine was so good that other languages copied it, and its pragmatic philosophy of making easy things easy and hard things possible influenced Python, Ruby, and PHP.
CPAN, its package repository, predates most modern package managers and remains one of the most complete language ecosystems ever assembled.Close Then the jokes started, the write-only language reputation stuck, and a generation of developers grew up assuming Perl was a cautionary tale rather than a working tool.Modern Perl is not the same language people mocked in 2005.
It has strict modes, signatures, excellent Unicode handling, and a mature object system.It is still one of the fastest ways to solve text-heavy problems, and it still runs a staggering amount of critical infrastructure.Related How ‘Hello World’ Became the Universal First Step for Programming Hello, is it me you’re looking for? Posts 3 By Bobby Jack OCaml solved problems the industry is still rediscovering A functional language that refuses to be academic OCaml is what happens when functional programming is designed by people who want to ship software rather than publish papers.
Its type system is powerful without being hostile, its module system is one of the most sophisticated in any language, and its native compiler produces fast binaries.Jane Street built a trading empire on it, the initial Rust compiler was written in it, and it remains a favorite for compilers, static analysis, and formal verification.The language is often overshadowed by Haskell, even though OCaml is frequently the more practical choice.
It has real mutations, real side effects, and a compiler that does not demand a PhD to use.Its tooling, once its weakest point, has improved dramatically with opam and dune.Yet outside a handful of industries, OCaml is treated as a curiosity.
That is a loss for developers who want functional programming without abandoning pragmatism, and it is a loss for the industry, which keeps reinventing ideas OCaml shipped decades ago.Ada was right about safety before safety was cool The language that took correctness seriously Ada was designed for systems where failure means people die.Aerospace, rail signaling, medical devices, and defense systems still depend on it, and for good reason.
Its type system, its concurrency model, and its support for formal verification are exceptional.The language prevents entire classes of bugs that C and C++ programmers spend their careers chasing, and its explicitness, often mocked as verbosity, is precisely what makes it reliable.The industry is now obsessed with memory safety, secure defaults, and provable correctness, all ideas Ada championed in the 1980s.
Rust deserves credit for bringing these concerns into the mainstream, but Ada was making the same arguments long before it was fashionable.Instead of recognition, Ada got a reputation for being old, government-mandated, and verbose.That reputation ignores its technical excellence and its continued use in the most demanding environments.
Related Why Linux is my IDE I prefer choice over integration when it comes to coding.Posts 12 By David Delony Erlang understood concurrency before anyone else needed it The language built for systems that cannot fail Erlang was designed for telephone switches, which means it was designed for systems that must stay up while hardware fails, software misbehaves, and traffic spikes without warning.Its actor model, its lightweight processes, and its ability to hot-swap code without stopping made it decades ahead of its time.
WhatsApp handled hundreds of millions of users with a tiny engineering team because Erlang’s concurrency model did the heavy lifting.RabbitMQ, telecom infrastructure, and countless distributed systems still run on it.Its syntax is unusual, its ecosystem is smaller than mainstream languages, and its reputation is confined to distributed systems circles.
Elixir has brought some of its ideas to a wider audience, but Erlang itself remains the reference implementation of fault tolerance.Modern languages keep reinventing actors, supervision trees, and structured concurrency, often less elegantly.Erlang is underrated because the problems it solves best are the ones most developers only discover after their systems fall over.
Lisp was right about almost everything The language that keeps being rediscovered Lisp is less a language than a family, spanning Common Lisp, Scheme, Clojure, Racket, and more.It invented garbage collection, recursion, dynamic typing, higher-order functions, macros, and REPL-driven development.Its homoiconicity, the idea that code is data, remains unmatched for metaprogramming.
It has been used in AI research, CAD software, spacecraft, and quantum computing, and its ideas appear in nearly every language released since.Related I transformed Claude into the ultimate coding tutor that tracks my progress (Prompt included) I built a coding tutor that won't let me cheat my way through it.Here's the prompt.
Posts By Dibakar Ghosh Despite this, Lisp is dismissed as a historical curiosity or an academic toy.Its syntax, or lack of it, is misunderstood, and its ecosystem is fragmented across dialects.The industry keeps rediscovering Lisp features and rebranding them as innovations, then forgetting where they came from.
Lisp is underrated because it was so far ahead that the industry is still catching up, and because its flexibility makes it harder to package into a simple narrative.Honorable mentions: Haskell and Prolog Haskell is not underrated in functional programming circles, but it is widely dismissed in the broader industry as too academic.In reality, it is a practical language with excellent concurrency and a type system that catches mistakes before they ship.
Similarly, Prolog is the most famous logic programming language, and logic programming as a paradigm remains genuinely underrated.It powers expert systems, natural language processing, and constraint solving, yet it is rarely taught outside specialized courses.The pattern across all of these languages is the same.
Each one solved a real problem, influenced the languages that came after it, and still does useful work today.Each one was also pushed aside by trends, marketing, or the simple human preference for whatever is new.Underrated does not mean obsolete, and it does not mean obscure.
It means the industry moved on before it finished learning what these languages had to teach.
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