Run array of promises despite of the result

promise-chain-run-all.js

'use strict'

global.state = {
  time: null,
  user: null,
  photo: null,
  book: null
}

const { getTime, getUser, getPhoto, getBook } = require('./promise_modules')

let asyncArray = [getTime, getUser, getPhoto, getBook]

let chain = Promise.resolve()

for (const func of asyncArray) {
  chain = chain.then(() => func()).catch((err) => { /* console.error(err + '') */  })
}

chain.then(() => {
  console.log('Chain ended')
  console.log(JSON.stringify(state, null, 4))
})

/*
Result:

Chain ended
{
    "time": {
        "epoch": 1514967155,
        "slang_date": "today",
        "slang_time": "a second ago",
        "iso8601": "2018-01-03T08:12:35Z",
        "rfc2822": "Wed, 03 Jan 2018 08:12:35 GMT",
        "rfc3339": "2018-01-03T08:12:35.00Z"
    },
    "user": {
        "error": "Error: Protocol \"http:\" not supported. Expected \"https:\""
    },
    "photo": {
        "albumId": 1,
        "id": 1,
        "title": "accusamus beatae ad facilis cum similique qui sunt",
        "url": "http://placehold.it/600/92c952",
        "thumbnailUrl": "http://placehold.it/150/92c952"
    },
    "book": {
        "status": 404,
        "error": {
            "Message": "No HTTP resource was found that matches the request URI 'https://fakerestapi.azurewebsites.net/api/Booksa/a'.",
            "MessageDetail": "No type was found that matches the controller named 'Booksa'."
        }
    }
}
*/

promise-modules.js

'use strict'

const https = require('https'), http = require('http')

let getTime = () => {

    return new Promise((resolve, reject) => {

        try {

            let url = 'https://now.httpbin.org/when/' + (new Date()).getTime()

            https.get(url, (res) => {

                let body = '';

                res.on('data', (chunk) => { body += chunk })

                res.on('end', () => {
                    let response = JSON.parse(body)
                    state.time = response.timestamp
                    resolve()
                })

            }).on('error', (e) => {
                  return reject(e + '')
            })

        } catch (e) {
            return reject(e + '')
        }
    })
}

let getUser = () => {

    return new Promise((resolve, reject) => {

        try {

            let url = 'http://jsonplaceholder.typicode.com/users/8'

            https.get(url, (res) => {

                let body = '';

                res.on('data', (chunk) => { body += chunk })

                res.on('end', () => {
                    let response = JSON.parse(body)
                    state.user = response
                    resolve()
                })

            }).on('error', (e) => {
                  return reject(e + '')
            })

        } catch (e) {
            state.user = { error: e + '' }
            return reject(e + '')
        }
    })
}

let getPhoto = () => {

    return new Promise((resolve, reject) => {

        try {

            let url = 'https://jsonplaceholder.typicode.com/photos/1'

            https.get(url, (res) => {

                let body = '';

                res.on('data', (chunk) => { body += chunk })

                res.on('end', () => {
                    let response = JSON.parse(body)
                    state.photo = response
                    resolve()
                })

            }).on('error', (e) => {
                  return reject(e + '')
            })

        } catch (e) {
            return reject(e + '')
        }
    })
}

let getBook = () => {

    return new Promise((resolve, reject) => {

        try {

            let url = 'https://fakerestapi.azurewebsites.net/api/Booksa/a'

            https.get(url, (res) => {

                let body = '';

                res.on('data', (chunk) => { body += chunk })

                res.on('end', () => {
                    let response = JSON.parse(body)
                    if (res.statusCode === 200) { state.book = response }
                    else if (res.statusCode >= 400 && res.statusCode < 500) { state.book = { status: res.statusCode, error: response } }
                    resolve()
                })

            }).on('error', (e) => {
                  state.book = { error: e + '' }
                  return reject(e + '')
            })

        } catch (e) {
            state.book = { error: e + '' }
            return reject(e + '')
        }
    })
}

module.exports = {
  getTime: getTime,
  getUser: getUser,
  getPhoto: getPhoto,
  getBook: getBook
}