'use strict';

const async = require('async');

console.log('Map array');

const arr = [1, 2, 3, 4];

async.map(

arr,

(item, callback) => {

console.dir({ item });

callback(null, item * 2);

},

(err, res) => {

console.dir({ err, res });

}

);

console.log('Map object');

const obj = { a: 1, b: 2, c: 3, d: 4 };

async.map(

obj,

(item, callback) => {

console.dir({ item });

if (item === 2) callback(new Error('Oh, shit'), 'value');

else callback(null, item * 2);

},

(err, res) => {

console.dir({ error: err.message, res });

}

);