Krasimir Tsonev krasimir

Rxjs

const next = (message)=> console.log("First observer message: " + message);
const error = (error) => console.log("Second observer error: " + error);
const complete = () => console.log("complete");

const next1 = (message)=> console.log("First observer message 1: " + message);
const error1 = (error) => console.log("Second observer error 1: " + error);
const complete1 = () => console.log("complete 1");

Array Iteration

https://gist.github.com/ljharb/58faf1cfcb4e6808f74aae4ef7944cff

While attempting to explain JavaScript's reduce method on arrays, conceptually, I came up with the following - hopefully it's helpful; happy to tweak it if anyone has suggestions.

Intro

JavaScript Arrays have lots of built in methods on their prototype. Some of them mutate - ie, they change the underlying array in-place. Luckily, most of them do not - they instead return an entirely distinct array. Since arrays are conceptually a contiguous list of items, it helps code clarity and maintainability a lot to be able to operate on them in a "functional" way. (I'll also insist on referring to an array as a "list" - although in some languages, List is a native data type, in JS and this post, I'm referring to the concept. Everywhere I use the word "list" you can assume I'm talking about a JS Array) This means, to perform a single operation on the list as a whole ("atomically"), and to return a new list - thus making it mu

Stuff I wish I'd known sooner about service workers

I recently had several days of extremely frustrating experiences with service workers. Here are a few things I've since learned which would have made my life much easier but which isn't particularly obvious from most of the blog posts and videos I've seen.

I'll add to this list over time – suggested additions welcome in the comments or via twitter.com/rich_harris.

Use Canary for development instead of Chrome stable

~~Chrome 51 has some pretty wild behaviour related to console.log in service workers. Canary doesn't, and it has a load of really good service worker related stuff in devtools.~~

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.

JSConf Slides, Codes and Notes

These are all the JSConf 2014 slides, codes, and notes I was able to cull together from twitter. Thanks to the speakers who posted them and thanks to @chantastic for posting his wonderful notes.

Modular frontend with NPM - Jake Verbaten (@Raynos)

Frontend Development

Attention: the list was moved to

https://github.com/dypsilon/frontend-dev-bookmarks

This page is not maintained anymore, please update your bookmarks.

	"use strict";

	[foo,bar] = TNG(foo,bar);
	// NOTE: intentionally not TNG(..) wrapping useBaz(), so that it's
	// basically like a "custom hook" that can be called only from other
	// TNG-wrapped functions

	function foo(origX,origY) {
	var [x,setX] = useState(origX);
	var [y,setY] = useState(origY);

	/**
	* SVG Fixer
	*
	* Fixes references to inline SVG elements when the <base> tag is in use.
	* Firefox won't display SVG icons referenced with
	* `<svg><use xlink:href="#id-of-icon-def"></use></svg>` when the <base> tag is on the page.
	*
	* More info:
	* - http://stackoverflow.com/a/18265336/796152
	* - http://www.w3.org/TR/SVG/linking.html

	define(function(require) {
	var React = require('react');

	var paramRegex = /__(\d)+/;
	var parser = new DOMParser();
	var errorDoc = parser.parseFromString('INVALID', 'text/xml');
	var errorNs = errorDoc.getElementsByTagName("parsererror")[0].namespaceURI;

	// turns the array of string parts into a DOM
	// throws if the result is an invalid XML document.

	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<title>Building a router</title>
	<script>
	// Put John's template engine code here...

	(function () {
	// A hash to store our routes: