From: http://phuu.net/2014/08/31/csp-and-transducers.html

"To me, transducers are a generic and composable way to operate on a collection of values, producing a new value or new collection of new values. The word 'transducer' itself can be split into two parts that reflect this definition: 'transform' — to produce some value from another — and 'reducer' — to combine the values of a data structure to produce a new one."