fp-ts Pipe and Flow Composition

Function composition is the heart of functional programming. fp-ts provides two powerful utilities for composing functions: pipe and flow. This guide covers everything you need to build elegant, type-safe pipelines.

Imports

import { pipe, flow, identity } from 'fp-ts/function'

Understanding Pipe vs Flow

pipe: Immediate Execution with a Starting Value

pipe takes a value and passes it through a series of functions, executing immediately.

// pipe(value, fn1, fn2, fn3) === fn3(fn2(fn1(value)))