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Async/Await, Promises, callbacks

Event driven architecture, event loop

Callback

• Come funzionano (esempio)

const fs = require('fs');

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'use latest';

/**
 * A simple tasks that renders a page where an user can input a phone number and its recipient to send an SMS message using the Twilio APis.
 * Please keep in mind that the following environment variables are required:
 * TWILIO_SID: The SID token of your Twilio account
 * TWILIO_AUTH_TOKEN: The auth token of your Twilio account
 * TWILIO_FROM_NUMBER: The sender of the SMS (created in your Twilio account)
 */

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# 1. Make sure to globally install the npm ios-deploy module first:
npm i -g ios-deploy

# 2. Run the following command:
react-native run-ios --device

# Hint - You can also specify the device name if needed:
react-native run-ios --device "Paul's iPhone"

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/* @flow */
import React, { Component } from 'react'
import { View } from 'react-native-animatable'
import metrics from 'src/config/metrics'

type Props = {
  isVisible: boolean,
  backgroundColor: string,
  animationTiming?: boolean
}

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import React, { PropTypes } from 'react'

import styles from './index.style.css'

const CustomListItem = ({ onClick, leftContent, rightContent, ...props }) => {
  return (
    <div className={styles.container} onClick={onClick} {...props}>
      <div className={styles.left}>{leftContent}</div>
      <div className={styles.right}>{rightContent}</div>
    </div>

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// 1. Define a state variable for showing/hiding the action-button 
state = {
  isActionButtonVisible: true
}

// 2. Define a variable that will keep track of the current scroll position
_listViewOffset = 0

// 3. Add an onScroll listener to your listview/scrollview
<ListView

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import Parse from 'parse/node'
import { afterEach, describe, it } from 'mocha'
import chai from 'chai'
import chaiAsPromised from 'chai-as-promised'

import { resetParse, getAdminUser } from '../../../test/parseHelper'
import errors from '../../utils/errors'

chai.use(chaiAsPromised)
const assert = chai.assert

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import React, { Component, PropTypes } from 'react'
import { DatePickerIOS, Text, TouchableOpacity, View } from 'react-native'
import { noop } from 'lodash'
import CustomModal from '../CustomModal'

import styles from './CustomDatePickerIOS.style'

export default class CustomDatePickerIOS extends Component {
  static propTypes = {
    visible: PropTypes.bool,

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import { find, findIndex, pullAt } from 'lodash'
import { actionTypes as appActionTypes } from 'reducers/appReducer'

export const actionTypes = {
  CREATE_MENU_ENTRY_REQUEST: 'MENU/CREATE_MENU_ENTRY_REQUEST',
  CREATE_MENU_ENTRY_SUCCESS: 'MENU/CREATE_MENU_ENTRY_SUCCESS',
  CREATE_MENU_ENTRY_FAILURE: 'MENU/CREATE_MENU_ENTRY_FAILURE',
  UPDATE_MENU_ENTRY_REQUEST: 'MENU/UPDATE_MENU_ENTRY_REQUEST',
  UPDATE_MENU_ENTRY_SUCCESS: 'MENU/UPDATE_MENU_ENTRY_SUCCESS',
  UPDATE_MENU_ENTRY_FAILURE: 'MENU/UPDATE_MENU_ENTRY_FAILURE',

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import { call, put } from 'redux-saga/effects'
import * as parseService from '../services/parseService'
import { actionTypes as authActionTypes } from '../reducers/authReducer'
import { actionTypes as navigationActionTypes } from '../reducers/navigationReducer'
import * as routes from '../config/routes'

export function* autoLogin (action) {
  const user = yield call(parseService.currentUser)
  if (user) {
    yield call(loginSuccess, user)