Function composition in JavaScript

Composes functions left to right so data flows through them in reading order.

const pipe = (...fns) => (input) =>
  fns.reduce((value, fn) => fn(value), input);

const addOne = (n) => n + 1;
const double = (n) => n * 2;
const addThenDouble = pipe(addOne, double);

Keywords and builtins used here

• const
• double

The run, in numbers

Lines

6

Characters to type

183

Tokens

62

Three-star pace

105 tpm

At the three-star pace of 105 tokens a minute, this run takes about 35 seconds.

Type this snippet

Step 3 of 5 in Composing functions, step 7 of 16 in Functions & patterns.

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