asyncArrayIterator

A replacement for for..loop statement and clean up your code from such + passing asynchronous result from the iteration. Usually we pass a statement inside the loop, such as if (i == array.length - 1) to check the loop has ended. It might be ok for small operation and start to become clunky when the array contains value which inherits lots of prototypes with method. Since for loop is synchronous, it's bad implementation for server side Node.js when you need to process async function inside it. asyncArrayIterator iterator pass a callback during iteration which will wait for all async function completion before moving to next iteration, which literaly you can wrap it inside a closure as well. If your for..loop return undefined, you might want to consider this as an option.

installation

npm i --save async-array-iterator

usage

var aai = require('async-array-iterator')

var arrData = [1, 2, 3];

function iterator(array, index, cb){
  
  var newVal = array[index] + 'add'

  cb(newVal)
}

function exec(res){
  console.log(res)
}

aai(arrData, iterator, exec) // [ '1add', '2add', '3add' ]

Options Parameter

asyncArrayIterator(array, iterator, exec, options)

• array: (object) array being process
• iterator: (function) function for iterating arrays, augmented with 'array', 'index' and pass a 'callback' method
• exec: (function) final function executed after all iterating is done
• options: (object, optional) you can pass attributes parameter if your arrays objects inherit prototype values.

usage with options

var aai = require('async-array-iterator')

var arrData = [
    {name: 'john', age: 24},
    {name: 'sarah', age: 5},
    {name: 'mickey', age: 13}
];

function iterator(array, index, cb){
    
    var newName = array[index].name + ' travolta'
    var newAge = array[index].age + 0.5
    var data = [newName, newAge]
    cb(data)
}

function exec(res){
    console.log(res)
}

aai(arrData, iterator, exec, {
    attributes: [ 'name', 'age']
}) // [ { name: 'john travolta', age: 24.5 }, 
   //   { name: 'sarah travolta', age: 5.5 }, 
   //   { name: 'mickey travolta', age: 13.5 } ] 

sample with using call()

var aai = require('async-array-iterator')

var getName = {
    first: null,
    last: null,
    fullname: function() {
        return this.first + ' ' + this.last
    }
}

var arrData = [{
    first: 'John',
    last: 'Ados'
}, {
    first: 'Sarah',
    last: 'Gabon'
}, {
    first: 'Mickey',
    last: 'Mouse'
}];

function iterator(array, index, cb) {
    var fullname = getName.fullname.call(array[index])
    cb(fullname)
}

function exec(res) {
    console.log(res)
}

aai(arrData, iterator, exec) // [ 'John Ados', 'Sarah Gabon', 'Mickey Mouse' ]