Sonny Nguyen phplaw

Node Error Handling and Domains

"Occurrences in this domain are beyond the reach of exact prediction because of the variety of factors in operation, not because of any lack of order in nature." - Albert Einstein

"Master of my domain" - Larry David

Error handling in an asynchronous language works in a unique way and presents many challenges, some unexpected. This tutorial reviews the various error handling patterns available in node, and explains how domains can be used to improve it.

There are four main error handling patterns in node:

Error return value

AngularJS Directive Attribute Binding Explanation

When using directives, you often need to pass parameters to the directive. This can be done in several ways. The first 3 can be used whether scope is true or false. This is still a WIP, so validate for yourself.

Raw Attribute Strings

<div my-directive="some string" another-param="another string"></div>

	let title: string = 'Hello World';
	// or let title = $('#user_name').val();

	(title as string).split(' ');
	(<string>title).split(' ');

	// fix window issue
	// Element implicitly has an 'any' type because type 'Window' has no index signature?
	declare global {
	interface Window { MyNamespace: any; }

	#!/bin/bash
	UP=$(pgrep mysql \| wc -l);
	if [ "$UP" -ne 1 ];
	then
	echo "Turn Mysql Server On.";
	# sudo service mysql start
	#/Library/Application\ Support/appsolute/MAMP\ PRO/db/mysql56
	nohup /Applications/MAMP/Library/bin/mysqld_safe --default_time_zone=Australia/Sydney --port=3306 --user=root --datadir=/Library/Application\ Support/appsolute/MAMP\ PRO/db/mysql56 --socket=/Applications/MAMP/tmp/mysql/mysql.sock --pid-file=/Applications/MAMP/tmp/mysql/mysql.pid --log-error=/Applications/MAMP/logs/mysql_error_log &>/dev/null &
	sleep 2 && ./rc.sh reload server development
	else

	const doQuery = function(db, sql, parameters) {
	if (parameters === void(0)) {
	parameters = [];
	}
	return new Promise(function(resolve, reject) {
	db.driver.execQuery(sql, parameters, function(err, result) {
	resolve(result);
	});
	});
	};

	let clickStream = Rx.Observable.fromEvent(document.getElementById('link'), 'click');

	clickStream
	.buffer(clickStream.debounce(250))
	.map(list => list.length)
	.filter(x => x === 2)
	.subscribe(() => {
	console.log('doubleclick');
	})

	# ---------------------------------------------------------------------------
	#
	# Description: This file holds all my BASH configurations and aliases
	#
	# Sections:
	# 1. Environment Configuration
	# 2. Make Terminal Better (remapping defaults and adding functionality)
	# 3. File and Folder Management
	# 4. Searching
	# 5. Process Management

	$(function() {
	// myApp for test directive to work, ng for $compile
	var $injector = angular.injector(['ng', 'myApp']);
	$injector.invoke(function($rootScope, $compile) {
	$('body').prepend($compile('<div ng-attr-tooltip="test">Cancel</div>')($rootScope));
	});
	});


	/**

	<!doctype html>
	<html ng-app="Demo">
	<head>
	<meta charset="utf-8" />

	<title>
	Hooking Into The ngRepeat Completion Event In AngularJS
	</title>

	<style type="text/css">

	<?php
	function time2str($ts) {
	if(!ctype_digit($ts)) {
	$ts = strtotime($ts);
	}
	$diff = time() - $ts;
	if($diff == 0) {
	return 'now';
	} elseif($diff > 0) {
	$day_diff = floor($diff / 86400);