AJ ajhsu

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.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

Close Android File Transfer
Open Activity Monitor and kill “Android File Transfer Agent”
Go to where you installed “Android File Transfer.app” (I have it under /Applications)
Ctrl+click –> “Show package contents”
Go to Contents/Resources
Rename “Android File Transfer Agent” to e.g. “Android File Transfer Agent_DISABLED”
Then go to “/Users/username/Library/Application Support/Google/Android File Transfer” and again rename the Agent app.

Live stream Xiaomi Ants Smart Camera via FFMPEG

This assumes you have a Xiaomi Ants Smart Camera that still has the open RTSP enabled. I think newer firmware might remove this capability. If you Google enough you can find instructions on how to downgrade.

FFMPEG

FFMPEG is where most of the magic happens. I use OSX and as such am a fan of using Homebrew to install free software. Here is my ffmpeg install command:

brew install ffmpeg --with-faac --with-fdk-aac --with-ffplay --with-fontconfig --with-freetype --with-frei0r --with-libass --with-libbluray --with-libcaca --with-libquvi --with-libsoxr --with-libssh --with-libvidstab --with-libvorbis --with-libvpx --with-opencore-amr --with-openjpeg --with-openssl --with-opus --with-rtmpdump --with-schroedinger --with-speex --with-theora --with-tools --with-webp --with-x265

Answering the Front-end developer JavaScript interview questions to the best of my ability.

Explain event delegation

Sometimes you need to delegate events to things.

Explain how this works in JavaScript

This references the object or "thing" defined elsewhere. It's like "hey, thing I defined elsewhere, I'm talkin' to you."

Explain how prototypal inheritance works.

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

	Lesson 1 - Iterations
	- BinaryGap - https://codility.com/demo/results/trainingU2FQPQ-7Y4/

	Lesson 2 - Arrays
	- OddOccurrencesInArray - https://codility.com/demo/results/trainingFN5RVT-XQ4/
	- CyclicRotation - https://codility.com/demo/results/trainingSH2W5R-RP5/

	Lesson 3 - Time Complexity
	- FrogJmp - https://codility.com/demo/results/training6KKWUD-BXJ/
	- PermMissingElem - https://codility.com/demo/results/training58W4YJ-VHA/

	- 我想要挑戰isomorphic，但目前好像比較少redux配isomorphic又配上webpack的方案

	- 這個範例可看，最近全部改寫過
	- https://github.com/coodoo/react-redux-isomorphic-example

	- 注意下面幾點

	- js/bootClient.js 與 js/bootServer.js

	- bootServer.js 負責做 server-render

	import './login.styl';
	import Component from '../components/component.react';
	import React from 'react';
	import exposeRouter from '../components/exposerouter.react';
	import {focusInvalidField} from '../lib/validation';

	@exposeRouter
	export default class Login extends Component {

	static propTypes = {

	/*
	* Copyright (C) 2015 Pavel Savshenko
	* Copyright (C) 2011 Google Inc. All rights reserved.
	* Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
	* Copyright (C) 2008 Matt Lilek <[email protected]>
	* Copyright (C) 2009 Joseph Pecoraro
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:

	var Slack = require('slack-client');
	var vm = require('vm');

	var s = new Slack('api key here', true, true);

	s.on('message', function(msg) {
	if(msg.type != 'message') {
	return;
	}