heron2014

useEffect(fn) // run function on every render
useEffect(fn, []) // run function only when the component is first rendered
useEffect(fn, [value]) //run function when component is first rendered and when the `value` changes

// Remember if you pass dependency(value) which is an object - React perform
// strict comparision using "===" of the first level properties and will not
// conduct comparisons deeper into the properties.

heron2014

// Class
componentWillUnmount() {
    console.log('I am unmouting');
}
 
// Hooks
useEffect(() => {
    return () => console.log('I am unmounting, run me to do any clean up');
}, [])

heron2014

// Class
componentDidUpdate(prevProps, prevState) {
  console.log('Prev state', prevState); // Before update
  console.log('New state', this.state); // After update 
}

 
// Hooks
useEffect(() => {
 // The big difference here is that useEffect doesn't provide previous state/prop value.

heron2014

// Class
componentDidMount() {
    console.log('Run me only when the component is first rendered/mounted');
}
 
// Hooks
useEffect(() => {
    console.log('Run this arrow function only when the component is first rendered/mounted');
}, [])

heron2014

useEffect(() => {}) // run arrow function every time the component is rendered

heron2014

Visual instructions how to enable Google Maps on IOS using react-native-maps

UPDATE: Following instructions are now a year old. I have recently managed to upgrade react-native-maps from 0.17 to the latest version 0.21 with react-native 0.51 - if you want to follow my instruction scroll down to the end this doc! Hope that will work for you too!

This is for my personal use, things might not be correctly explained here. For the official docs please check https://github.com/airbnb/react-native-maps

Steps from scratch:

1.react-native init GoogleMapPlayground

heron2014

const getAllInheritedPropNames = (obj) => {
  let props = [];
  do {
    props = props.concat(Object.getOwnPropertyNames(obj));
  } while (obj = Object.getPrototypeOf(obj));
  return props;
};

heron2014

import React from "react";
import { render } from "react-dom";

const ParentComponent = React.createClass({
  getDefaultProps: function() {
    console.log("ParentComponent - getDefaultProps");
  },
  getInitialState: function() {
    console.log("ParentComponent - getInitialState");
    return { text: "" };

heron2014

exports.register = function (plugin, options, done) {

    plugin.ext('onPreResponse', function (request, reply) {

        var response = request.response;
        if (response.isBoom) {
            var error = {
                title: response.output.payload.error,
                status: response.output.statusCode,
                detail: response.output.payload.message