pipe.js

// Pipe in JS
// @see 
//  - https://www.freecodecamp.org/news/pipe-and-compose-in-javascript-5b04004ac937/
//  - https://medium.com/javascript-scene/reduce-composing-software-fe22f0c39a1d

// Utility functions for example
const getName = (person) => person.name

const uppercase = (string) => string.toUpperCase()

const get6Characters = (string) => string.substring(0, 6)

const reverse = (string) =>
  string
    .split('')
    .reverse()
    .join('')

// Units logs
const person = { name: 'Buckethead' }
console.log({
  person, 
  getName: getName(person),                     // 'Buckethead'
  uppercase: uppercase(person.name),            // 'BUCKETHEAD'
  get6Characters: get6Characters(person.name),  // 'Bucket'
  reverse: reverse(person.name),                // 'daehtekcuB'
})

// Traditional way
const traditional = reverse(get6Characters(uppercase(getName({ name: 'Buckethead' }))));

console.log({ traditional }) // 'TEKCUB'

// Pipe
const pipe = (...fns) => (x) => fns.reduce((v, f) => f(v), x)

const outputWithPipe = pipe(
  getName,
  uppercase,
  get6Characters,
  reverse
)({ name: 'Buckethead' });

console.log('Result with pipe()', { 
  traditional,                                  // 'TEKCUB'
  outputWithPipe,                               // 'TEKCUB'
  isEqual: traditional === outputWithPipe       // true
});