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pipe ​

Problem ​

You need to chain functions left-to-right, passing the output of each step as the input to the next.

Solution ​

Use pipe(...fns) to create a left-to-right pipeline. Pass zero arguments to get the identity function.

ts
import { pipe } from '@vielzeug/arsenal';

const process = pipe(
  (s: string) => s.trim(),
  (s) => s.toUpperCase(),
);

process('  hello world  '); // 'HELLO WORLD'

// Zero args → identity
const id = pipe(); // <T>(x: T) => T

Pitfalls ​

  • TypeScript can only infer up to a fixed number of intermediate types; annotate when the chain is very long.
  • Each step must accept the return type of the previous step.