fn-pipe

Pipe pattern for composing your functions in order to complete the required process in much readable way

Introduction

Pipe is a function where you can pass multiple functions with first function payload and this payload will be passed from function to function in order to complete the required process.

Normal pipe Example

It is very easy to read and write a single pipe like below.

  import { pipe } from 'fn-pipe';
 
  const numbers = [1, 2, 3, 4, 5];
  const newNumbers = pipe(
    num => num.map(n => n + 1),
    num => num.reduce((acc, n) => [...acc, n * 2], []),
    num => num.map(n => n + 1)
  )(numbers)
  // return [5, 7, 9, 11, 13]

So in real world you can simply compose your functions in pipe like below

  import { pipe } from 'fn-pipe';
 
  const userPipe = pipe(
    getUserById,
    getUserHistory,
    transformHistory,
    convertToJson
  )(userId)

Promise pipe Example

In pipe, if any function has promise so pipe will return a new promise

  import { pipe } from 'fn-pipe';
 
  // if you have a promise
  const myPromise = (num) => new Promise((resolve, reject) => {
    if(true){
      setTimeout(() => {
         resolve(num)
      }, 3000)
    } else {
      reject({
        error: "Promise reject"
      })
    }
  })
 
  // then you have a normal function
  const myOwnFn = (num) => {
    return num.filter(num => num != 5)
  }
  
  // then pipe
  const numbers = [1, 2, 3, 4, 5];
  const promise = pipe(
    myPromise,
    myOwnFn
  )(numbers)
  // return new promise
  promise
    .then(res => console.log(res)) // [1, 2, 3, 4]
    .catch(err => console.log(err))

Installation

Run the below command to install using NPM

npm install --save fn-pipe

Contribution

Feel free to fork, extend, create issues, create PRs or spread the word.

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