Harry Wolff hswolff

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

Sublime-Style-Column-Selection
Enable Sublime style 'Column Selection'. Just hold 'alt' while you select, or select using your middle mouse button. Also similar to Texmate's 'Multiple Carets', or BBEdit's 'Block Select'

activate-power-mode
Activate POWER MODE to write your code in style.

atom-alignment
A simple key-binding for aligning multi-line and multiple selections in Atom (Based on the sublime text plugin)

atom-beautify

Here's my own list of the interesting stuff announced during this year's WWDC, collected from the keynotes, various Apple docs, blog posts and tweets.

If you're planning to watch the videos, I really recommend this Mac app that helps you download and watch them: https://github.com/insidegui/WWDC.

OS X El Capitan

http://www.apple.com/osx/elcapitan-preview/

split view - two apps side by side on full screen

ANNOUNCEMENT

I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!

\

	/** Async version of Array.prototype.reduce()
	* await reduce(['/foo', '/bar', '/baz'], async (acc, v) => {
	* acc[v] = await (await fetch(v)).json();
	* return acc;
	* }, {});
	*/
	export async function reduce(arr, fn, val, pure) {
	for (let i=0; i<arr.length; i++) {
	let v = await fn(val, arr[i], i, arr);
	if (pure!==false) val = v;

	import React from 'react'
	import {observer} from 'mobx-react'
	import {observable} from 'mobx'

	const state = observable({
	value: 0
	})

	const Comp = (props) => {
	return <div onClick={() => state.value++}>click to increase counter value: {state.value}</div>

	// Define your components like:
	class MyComponent extends React.Component {
	static fetchData = (params) => {
	// return an action here.
	};

	/* ... */
	}

	function fetchComponentData(component, store, params) {

	{
	"exclamations": [
	"Holy Agility",
	"Holy Almost",
	"Holy Alphabet",
	"Holy Alps",
	"Holy Alter Ego",
	"Holy Anagram",
	"Holy Apparition",
	"Holy Armadillo",

	Disclaimer: The instructions are the collective efforts from a few places online.
	Nothing here is my original. But I want to put them together in one place to save people from spending the same time as I did.

	First off, bundle.
	==================

	1. cd to the project directory
	2. Start the react-native packager if not started
	3. Download the bundle to the asset folder:
	curl "http://localhost:8081/index.android.bundle?platform=android" -o "android/app/src/main/assets/index.android.bundle"

	#import <Foundation/Foundation.h>
	#import "RCTBridgeModule.h"

	#define RCT_EXTERN_MODULE(objc_name, objc_supername) \
	RCT_EXTERN_REMAP_MODULE(objc_name, objc_name, objc_supername)

	#define RCT_EXTERN_REMAP_MODULE(js_name, objc_name, objc_supername) \
	objc_name : objc_supername \
	@end \
	@interface objc_name (RCTExternModule) <RCTBridgeModule> \