transformers
general description
Transformers are utility function which decorate reducers: they take a reducer as input, and output another reducer, with added functionality. They are extremely useful when used with transduce, as they are very modular and thus easily composable.
some definitions
reducer
A reducer is a function whose role is to merge an item into an accumulator (a entity containing already merged values). Usually, a reducer is called several times while iterating over an iterable. For example, Array.prototype.push is a reducer: it takes an accumulator (the array) and an item, and merges the item into the array. In conductor, reducers have the following type signature:
transformer
A transformer is a function whose role is to decorate (add functionality) to a reducer. It accepts an input reducer, and outputs another reducer. Transformers have the following type signature:
transducer
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