Functional Programming Languages Sentiment Ranking

The only ranking on the web, based on sentiment, not popularity. Find out which functional language is loved and which gathers the most negative feedback.

This ranking is the first update of the Functional Programming Languages Sentiment Ranking published in April 2021. 

The sentiment analysis mechanism behind the ranking is based on the most popular achievements related to artificial intelligence – i.e., deep learning networks and embedding. 

We’ve been gathering data for 3 months and have analyzed 160,556 mentions, which have given us insights into 14 functional programming languages (2 more languages than in the previous edition of the ranking). We have aggregated them using the sentiment analysis feature in Brand24.  

Key takeaways

Most Loved
With 55% of positive mentions, Swift wins first place in people’s hearts being the most positive of the bunch.
Not on track anymore
Compared to the previous ranking, most of all Elm has lost its good reputation. Its number of positive mentions has decreased by 7%.
Rising stars
Everyone has their five minutes of fame, so while Elm is not on track anymore, Clojure and Idris have gained more positive feedback than previously - 3% more positive mentions.
Most popular
The most talked-about functional language is Swift, with 51,605 mentions.
Black sheep
The language with the most negative sentiment is PureScript, with 14.88 % of negative mentions.
The newbies
F# and Rescript debuted in our ranking. And it’s not a bad debut. F# is the second most loved language, and Rescript sits comfortably in the middle.


Daniel Ciocîrlan Rock The JVM
Daniel Ciocîrlan

Founder & Instructor at Rock The JVM

This report confirms what I've also found in my own experience as an instructor at Rock the JVM: Scala is an expressive and powerful language, and once people get a taste of it, they rarely go back to anything else. Of course, like anything else in tech, there's room for improvement. Because of its power and almost limitless capability, Scala can seem quite daunting to beginners - on this front, it's up to educators like myself to contribute to the community and make the learning process easier and smoother for newcomers.
Zuka Kakabadze
Zuka Kakabadze

Founder & CTO at

Functional programming makes code modular and composable, and this can result in an exponential increase in software development productivity. It's interesting to see how functional programming concepts are propagating across more and more programming languages. This research is a key indicator of how to measure the heartbeat, and it tells us that the sentiment is mostly positive. This data can allow language developers to learn from each other's successes, as well as mistakes.
Jakub Czuchnowski
Jakub Czuchnowski

CTO & Co-founder at Scalac

The second edition of our index didn't bring any revolutionary changes. Also hardly any evolutionary. It's too early to identify trends yet, but we're getting there. The new entry of F# at second place is not a surprise. It's well known that both the language and the community are liked and respected. On the other hand Rescript, while far away from the top, is the top FP language on the frontend. I'm quite happy to see it as I would very like to see more adoption of it. Clojure noted the biggest change. Is this a glitch or a trend? We'll keep an eye on that. Scala vs Kotlin is still a close call. So what's next? As I mentioned before, once we have more data, we'll be able to identify trends. I think it would also be interesting to see these changes overlayed with a timeline of events (conferences etc.) for every ecosystem. Also maybe we could start an annual Most Positive Influencer Award? Let me know on Twitter @jczuchnowski.

Functional Programming Languages Sentiment Ranking

Most positive
Most negative
0 20 40 60 80 100
Positive rank
Negative rank
Programming language
Positive mentions
Negative mentions
Number of mentions

60% of our projects come from referrals.

Work with us and join our satisfied clients.
cats scala 3 scala 3.0
We can help you if you need a team to build your dedicated solution, a consultation to move forward with your project, or a team extension to get rid of bottlenecks.
satisfied clients. Most of them worked with us on 2+ projects
consultants and developers ready for new projects and challenges
years on the software development market

Trusted by

That’s what Percent’s Divisons head thinks about our 2 yeats of work. Need a development partner? Let’s have a free and confidential chat.

Adtech data retrieval, processing and distribution process
Request Verification Process for Finances
Real-time event manager & Mobile API Adapter
Blockchain data solution

“They were able to quickly become acquainted with highly complex requirements and always delivered on time.

That’s what Rami Akkas, Technology Strategy COO at SAP thinks about our work.
Need a development partner? Let’s have a free and confidential chat.
Let's talk

Latest Blogposts

19.01.2022 / By Daria Karasek

Battle Tested, Event-Driven Patterns for your Microservices Architecture by Natan Silnitsky

Scalac invited Natan Silnitsky, who works as a senior backend infrastructure developer at, to speak at its “Between Business & Tech” conference. In his excellent presentation, Natan spoke about how Wix leverages tailored models to build highly efficient event-driven, distributed microservice environments. Wix is a website-building platform with more than two hundred million registered […]

17.01.2022 / By Jorge Vasquez

How to write a (completely lock-free) concurrent LRU Cache with ZIO STM

Writing concurrent data structures using traditional tools - just like everything else under java.util.concurrent - is generally very complicated. So, in this article, we are going to see how ZIO STM can make our lives a lot easier when it comes to writing concurrent data structures - such as a concurrent LRU Cache - in a completely lock-free fashion that is a lot simpler to reason about.

20.12.2021 / By Michal Koziorowski

Scaling your team with junior developers is more important than ever.

The background of the article: A software development company at the heart of tech community. We were very happy to visit the 2021 Web Summit in Lisbon. Despite the city being stormy and unwelcoming at first sight, we found it a really pleasant place to hang out and spend 3 busy days at the conference. […]