Heroku Blog

We’re very excited to announce official support for Clojure, going into public beta as of today. Clojure is the third official language supported by Heroku, and is available on the Cedar stack.

Clojure is a Lisp-like functional programming language which runs on the Java Virtual Machine (JVM). It offers powerful concurrency primitives based on immutable data structures, with emphasis on composability and correctness. The Clojure community is vibrant and growing quickly.

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In 2006, I wrote Catapult: a Quicksilver-inspired command-line for the web. I deployed it to a VPS (Slicehost), then gave the URL out to a few friends. At some point I stopped using it, but some of my friends remained heavy users. Two years later, I got an email: the site was down.

Logging into the server with ssh, I discovered many small bits of breakage:

• The app’s Mongrel process had crashed and not
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Visibility and introspection capabilities are critical for managing and debugging real-world applications. But cloud platforms are often lacking when it comes to visibility. The magical black box is great when it "just works," but not so great when your app breaks and you can't look inside the box.

Standard introspection tools used in server-based deployments — such as ssh, ps aux, top, tail -f logfile, iostat — aren't valid in a multi-tenant cloud environment. We …

Node.js has gotten its share of press in the past year, achieving a level of attention some might call hype. Among its touted benefits are performance, high concurrency via a single-threaded event loop, and a parity between client-side and sever-side programming languages which offers the Promethean opportunity of making server-side programming accessible to front-end developers.

But what is Node.js, exactly? It's not a programming language – it's simply Javascript. It's not a VM: …

In the beginning was the command line. The command line is a direct and immediate channel for communicating with and controlling a computer. GUIs and menus are like pointing and gesturing to communicate; whereas the command line is akin to having a written conversation, with all the nuance and expressiveness of language.

This is not lost on developers, for whom the command prompt and blinking cursor represents the potential to run anything, to do anything. …

Ruby 1.9.2 on Bamboo is now the default for new apps created on Heroku.

As we said back in April: Ruby 1.9.2 as the new gold standard for production Ruby apps. In 2011, we’ve seen more and more developers move to 1.9.2. It’s fast, stable, and sees excellent support throughout the community.

You can always list available stacks with the heroku stack command; and if you want your new app on Ruby 1.8.7 you …