Roy Ling royling

References

Mixin

A mixin is an abstract subclass; i.e. a subclass definition that may be applied to different superclasses to create a related family of modified classes.

Gilad Bracha and William Cook, Mixin-based Inheritance

mixin definition: The definition of a class that may be applied to different superclasses.

http://blog.angular-university.io/angular2-ngmodule/

Modules are very useful, but beware of the following pitfalls:

do not redeclare a component, directive, etc. in more than one module

modules do not create their own DI context, so injectables are available also outside the module

unless the module is lazy loaded, in that case a separate DI context is created by the router to avoid accidental injectable overrides and prevent hard to troubleshoot bugs >- if you have a shared module that needs to be added to a lazy loaded module, make sure that it does not have providers, because that would create duplicate service instances (unless that is the intended behavior)

Sync observables created from a synchronous source will emit values synchronously, so the observers will receive values in the order of subscription.

The source iterable is traversed for each observer subscribed. For example, the size of source iterable is M, there are N observers, so the traversal times is M*N. This is explained in RxJS5 Manual:

Plain Observables are unicast (each subscribed Observer owns an independent execution of the Observable)

let sub = Rx.Observable.range(0, 3);

sub.subscribe(value => console.log(`observer 1: ${value}`));
sub.subscribe(value => console.log(`observer 2: ${value}`));

	package main

	import "fmt"

	// fibonacci is a function that returns
	// a function that returns an int.
	func fibonacci() func() int {
	a, b := 0, 1
	return func() int {
	i := a

	chrome.action.onClicked.addListener((tab) => {
	chrome.scripting.executeScript({
	target: {
	tabId: tab.id,
	},
	files: ["content.js"],
	});
	});

	// Copy and save the script as a predefined snippet in Chrome Devtools
	// Run it to proceed to an insecured website if blocked by Chrome
	// See how to use snippets: https://developers.google.com/web/tools/chrome-devtools/javascript/snippets
	(function() {
	const link = document.querySelector('#proceed-link');
	if (link && link.tagName.toLowerCase() === 'a') {
	link.click();
	} else if (
	typeof sendCommand === "function" &&
	SecurityInterstitialCommandId &&

	/*
	* Copyright 2002-2012 the original author or authors.
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software

	#!/bin/sh

	USERNAME=user_name
	HOST=vpn.example.com

	vpn=/opt/cisco/anyconnect/bin/vpn

	case "$1" in
	connect )
	shift

	wget https://raw.githubusercontent.com/git/git/master/contrib/completion/git-completion.bash
	# add to .bashrc
	source ~/git-completion.bash

	const parseInput = input => input.split(', ').map(value => {
	return { turn: value[0], blocks: Number(value.slice(1)) };
	});

	const turnToDirection = {
	N: { L: 'W', R: 'E' },
	S: { L: 'E', R: 'W' },
	E: { L: 'N', R: 'S' },
	W: { L: 'S', R: 'N' }
	};