Björn Rixman bjrn

What is RNRF (react-native-router-flux)?

React Native is great product but lacks for stable, intuitive and easy navigation API during many years. Every year we see new, better API: Native Navigator, ex-Navigator, NavigationExperimental, ex-Navigation, wix native navigation, airbnb native navigation, ReactNavigation...

Once I've started React Native development, in 2015, I created RNRF - simple API for easy navigation. It was clear that better navigation instruments will come later but I didn't want to change my code again and again to switch for better API. Every new major version of RNRF is based on different navigation framework and mostly preserves own API.

Another goal was to represent all navigation flow within one place in clear, human-readable way - similar to iOS Storyboards concept. This way other engineers could understand your app flow faster.

A lot of people mentioned other immutable JS libraries after reading my post. I thought it would be good to make a list of available ones.

There are two types of immutable libraries: simple helpers for copying JavaScript objects, and actual persistent data structure implementations. My post generally analyzed the tradeoffs between both kinds of libraries and everything applies to the below libraries in either category.

Libraries are sorted by github popularity.

Persistent Data Structures w/structural sharing

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.

tl;dr

If you must nest functions in a way that requires access to multiple this', alias outer this to something meaningful - describe the value it's holding. Treat this as the invisible first argument.

In general though, avoiding the situation (nested functions and frivolous use of this) will frequently produce clearer results.

Naming `this` in nested functions

I was accidentally included in a discussion on how to best name this in nested functions in JavaScript. +1's were given to this suggestion of using _this.

Giving style advice on naming nested this without a meaningful context isn't too helpful in my opinion. Examples below have been altered to have at least some context, although a completely contrived and stupid one.

This article has been given a more permanent home on my blog. Also, since it was first written, the development of the Promises/A+ specification has made the original emphasis on Promises/A seem somewhat outdated.

You're Missing the Point of Promises

Promises are a software abstraction that makes working with asynchronous operations much more pleasant. In the most basic definition, your code will move from continuation-passing style:

getTweetsFor("domenic", function (err, results) {
 // the rest of your code goes here.

	export default function createCrudHooks({
	baseKey,
	indexFn,
	singleFn,
	createFn,
	updateFn,
	deleteFn,
	}) {
	const useIndex = (config) => useQuery([baseKey], indexFn, config)
	const useSingle = (id, config) =>

	/*
	* Enhances 'require' from RequireJS with Promises API while preserving its original semantics.
	*/

	(function() {

	if (!Promise \|\| !require) {
	return;
	}

	var btn = document.getElementById("copy-button");
	btn.addEventListener("click", clickHandler, false);
	btn.addEventListener("copy", copyHandler, false);

	function clickHandler(e) {
	e.target.dispatchEvent(new ClipboardEvent("copy"));
	}

	function copyHandler(e) {
	e.clipboardData.setData("text/plain", "Simulated copy. Yay!");

	<?xml version="1.0" encoding="UTF-8"?>
	<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
	<plist version="1.0">
	<dict>
	<key>author</key>
	<string>Jacob Rus</string>
	<key>comment</key>
	<string>Created by Jacob Rus. Based on ‘Slate’ by Wilson Miner</string>
	<key>name</key>
	<string>Cowboy - Presentation</string>

	if (!window.console) {
	(function() {
	var names = ["log", "debug", "info", "warn", "error", "assert", "dir", "dirxml",
	"group", "groupEnd", "time", "timeEnd", "count", "trace", "profile", "profileEnd"];
	window.console = {};
	for (var i = 0; i < names.length; ++i) {
	window.console[names[i]] = function() {};
	}
	}());
	}