Pipeline operator cards
Recall the practical decision rules for collection pipelines, function composition, and transducers.
Pipeline vs function composition Compare Pipeline runs a current value through steps now; composition builds a reusable function recipe from smaller functions. Pipeline is execution with a value; composition is a reusable function recipe. Objection: "Just use reduce for the whole thing." Use this when a reducer is doing selection, transformation, and accumulation in one callback. Reduce can express the whole pipeline, but splitting filter, map, and reduce lets each step advertise its contract. Your line Reduce can express all of it, but it hides which job is happening. If we split filter, map, and reduce, each step advertises its…
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