Paweł Tymczuk LetItRock

S3 Static Sites

What this will cover

Host a static website at S3
Redirect www.website.com to website.com
Website can be an SPA (requiring all requests to return index.html)
Free AWS SSL certs
Deployment with CDN invalidation

Resources

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Element

Box metrics

elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent
elem.clientLeft, elem.clientTop, elem.clientWidth, elem.clientHeight
elem.getClientRects(), elem.getBoundingClientRect()

Create-React-App with Sass configuration

Here are instructions for add Sass support to an app built with create-react-app. Hopefully this will be redundant when Sass support is built into the tool! Visit their form and let them know you need Sass support.

Install the create-react-app tool from npm. This will be installed globally. We also need to install the loaders needed for webpack, and we will save those as development dependencies.

npm install -g create-react-app

create-react-app your-app-name
cd your-app-name

	package com.chapters.training;


	import java.util.ArrayList;
	import java.util.HashSet;
	import java.util.List;
	import java.util.Set;

	public class HashMap<K , V> {

	// The following code is a series of test that were written in the order you'll read them. After
	// each test was written it was run against the HashMap and the implementation was updated if it
	// failed. The HashMap code is the final implementation that was built naively to pass each test.

	// The Tests:

	public class HashMapTest {
	private HashMap map;

	// Set up an empty map before each test

	@mixin for-size($size) {
	@if $size == phone-only {
	@media (max-width: 599px) { @content; }
	} @else if $size == tablet-portrait-up {
	@media (min-width: 600px) { @content; }
	} @else if $size == tablet-landscape-up {
	@media (min-width: 900px) { @content; }
	} @else if $size == desktop-up {
	@media (min-width: 1200px) { @content; }
	} @else if $size == big-desktop-up {

	-server
	-Xms2048m
	-Xmx2048m
	-XX:NewSize=512m
	-XX:MaxNewSize=512m
	-XX:PermSize=512m
	-XX:MaxPermSize=512m
	-XX:+UseParNewGC
	-XX:ParallelGCThreads=4
	-XX:MaxTenuringThreshold=1

	public Observable<FilesWrapper> download(List<Thing> things) {

	return Observable.from(things)
	.flatMap(thing -> {
	File file = new File(getExternalCacheDir() + File.separator + thing.getName());
	if (file.exists()) {
	return Observable.just(file);
	}

	Request request = new Request.Builder().url(thing.getUrl()).build();

	# to generate your dhparam.pem file, run in the terminal
	openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048