array-reducer

Never carry anymore about async reduce an array. Install with:

npm i array-reducer

Start requiring and then make the magic happen

const reducer = require('array-reducer')

You might need 3 arguments:

reducer(array, fn, acc)

• array might be an array of whatever you want
• fn is your reducer function. Here you can go async or sync, doesn't matter
• acc is the default accumulator value for your reducer function fn

Samples

You might use reducers the way you want withouth carying if the reducer function shall fetch something from the database, make an external api call or a simple sum.

async/await

Make things meaningful, avoid promise/callback hell!

const reducer = require('array-reducer')

const arr = [1, 2, 3, 4]
const sum = async (n, m) => n + m

const result = await reducer(arr, sum, 0)
console.log(result) // 10

promise

Connect in a promise chain

const reducer = require('array-reducer')

const arr = [1, 2, 3, 4]
const sum = (n, m) => new Promise(resolve => resolve(n + m))

reducer(arr, sum, 3).then((result) => {
  console.log(result)  // 13
})

standard/sync

Go simple

const reducer = require('array-reducer')

const arr = [1, 2, 3, 4]
const sum = (n, m) => n + m

const result = reducer(arr, sum, 5)
console.log(result) // 15

Go beyond! Go fancy!

It's not only about numbers or aggregations, we can go further.

const reducer = require('array-reducer')

const arr = [['drink', 'beer'], ['eat', 'hotdog']]
const toObject = (obj, [prop, value]) => ({
  ...obj,
  [prop]: value,
})

const result = reducer(arr, toObject, {})
console.log(result) // { drink: 'beer', eat: 'hotdog' }