Pipe

Left-to-right function composition for the standalone Result/Option combinators.

Result and Option combinators are standalone, curried functions rather than methods — there’s no result.map().andThen(). pipe is how you compose them, since TypeScript has no native pipe operator.

import { pipe } from "@zap-studio/monads";

pipe(5); // 5, no functions applied
pipe(5, (n) => n + 1); // 6
pipe(
  5,
  (n) => n + 1,
  (n) => n * 2,
); // 12

With Result

import { err, ok, pipe, Result } from "@zap-studio/monads";

pipe(
  ok(2),
  Result.map((n) => n * 2),
  Result.andThen((n) => (n > 0 ? ok(n) : err("not positive"))),
  Result.unwrapOr(0),
); // 4

With Option

import { Option, pipe, some } from "@zap-studio/monads";

pipe(
  some(2),
  Option.map((n) => n * 2),
  Option.unwrapOr(0),
); // 4

Each function in the chain receives the previous function’s return value, left to right — pipe(value, f, g, h) is h(g(f(value))).