Transducers

Before we finish up with our core.async portion of this book, we should mention what came up in Clojure 1.7, as well as how this affects core.async.

One of the big changes in this release was the introduction of transducers. We will not cover the nuts and bolts of it here, but rather focus on what it means at a high-level with examples using both Clojure sequences and core.async channels.

If you would like to know more, I recommend Carin Meier's Green Eggs and Transducers blog post^[4]. It's a great place to start.

Additionally, the official Clojure documentation site on the subject is another useful resource^[5].

Let's get started by creating a new Leiningen project:

$ lein new core-async-transducers

 

 

 

 

Now, open your project.clj file and make sure you have the right dependencies:

... 
  :dependencies [[org.clojure/clojure "1.9.0"] 
                 [org.clojure/core.async "0.4.474"]] 
... 

Next, fire up a REPL session in the project root and require core.async, which we will be using...