A quick introduction to pipe() and compose() in JavaScript

compose.js

// What about compose()?
// It’s just pipe in the other direction.

compose = (...function) => (value) => fns.reduceRight((currentValue, currentFunction) => currentFunction(currentValue), value);

compose(
  reverse,
  get6Characters,
  uppercase,
  getName
)({ name: 'anhdiepmmk' });

pipe-async.js

// https://www.30secondsofcode.org/js/s/pipe-async-functions

const pipeAsyncFunctions = (...fns) =>
  arg => fns.reduce((p, f) => p.then(f), Promise.resolve(arg));

const sum = pipeAsyncFunctions(
  x => x + 1,
  x => new Promise(resolve => setTimeout(() => resolve(x + 2), 1000)),
  x => x + 3,
  async x => (await x) + 4
);

(async() => {
  console.log(await sum(5)); // 15 (after one second)
})();

pipe.js

// original tutorial url: https://www.freecodecamp.org/news/pipe-and-compose-in-javascript-5b04004ac937/

pipe = (...functions) => (value) => {
  return functions.reduce((currentValue, currentFunction) => {
    return currentFunction(currentValue);
  }, value);
};

getName = (person) => person.name;
uppercase = (string) => string.toUpperCase();
get6Characters = (string) => string.substring(0, 6);

const avalue = pipe(
  getName,
  uppercase,
  get6Characters
)({name: 'anhdiepmmk'});

console.log(avalue);

// OUTPUT: ANHDIE