A fascinating read on how transducers work, building them up from scratch from reducers using JavaScript, then showing how to uses built-in transducers from Ramda. And if all that sounds like gobbledygook, you’re not alone - but read this article and it will start to make sense. :)

Author James Sinclair on why bother learning this challenging concept:

A solution that would give us the elegance of using small, simple functions. But also the efficiency of doing our processing in a single pass through the array. What is this magical solution? It’s a concept called a transducer.