Alfonso alfonsodev

When should you use action creator and when reducer?

Action creator

you need to have side effects
you need to read from store to decide what to do
you need to dispatch more than one action
action produced by action creator needs to contain all the data reducer can need to shape the components state

Reducer

should not have any side effects

Docker - How to cleanup (unused) resources

Once in a while, you may need to cleanup resources (containers, volumes, images, networks) ...

delete volumes

// see: https://github.com/chadoe/docker-cleanup-volumes

$ docker volume rm $(docker volume ls -qf dangling=true)

$ docker volume ls -qf dangling=true | xargs -r docker volume rm

Change your database RDS instance security group to allow your machine to access it.
- Add your ip to the security group to acces the instance via Postgres.
Make a copy of the database using pg_dump
- $ pg_dump -h <public dns> -U <my username> -f <name of dump file .sql> <name of my database>
- you will be asked for postgressql password.
- a dump file(.sql) will be created
Restore that dump file to your local database.
- but you might need to drop the database and create it first
- $ psql -U <postgresql username> -d <database name> -f <dump file that you want to restore>

the database is restored

Mobile Safari's 100% Height Dilemma

Whether you're developing a web application with native-ish UI, or just a simple modal popup overlay that covers the viewport, when it comes to making things work on iDevices in Mobile Safari, you're in for a decent amount of pain and suffering. Making something "100% height" is not as easy as it seems.

This post is a collection of Mobile Safari's gotchas and quirks on that topic, some with solutions and fixes, some without, in good parts pulled from various sources across the internets, to have it all in one place. Things discussed here apply to iOS8, iOS9 and iOS10.

The Disappearing Browser Chrome

Screen real estate on smartphones is limited, so Mobile Safari collapses the browser chrome (address bar and optional tab bar at the top, and tool bar at the bottom) when the user scrolls down. When you want to make something span exactly the height of the viewport, or pin something to the bottom of the screen, this can get tricky because the viewport changes size (or

Functional, Reactive, and Distributed Systems Bibliography

Books

CQRS Journey: Free ebook from Microsoft (Print book available for purchase)
Functional and Reactive Domain Modeling: A high level overview of how to build up domain models using free monads and interpreters.
Reactive Microservices Architecture: Free booklet from Lagom and O'Reilly
Reactive Messaging Patterns with the Actor Model: Applications and Integration in Scala and Akka
Domain-Driven Design: Tackling Complexity in the Heart of Software

Note: This post is a summary of information paraphrased from an excellent blog post by Christian Sepulveda.

Prerequisites

Instructions

Create the app and download the necessary dependencies.

Reset mysql root password in Mac OS:

First Stop MySQL:

Go to: 'System Preferences' >> 'MySQL' and stop MySQL

OR,

sudo /usr/local/mysql/support-files/mysql.server start
sudo /usr/local/mysql/support-files/mysql.server stop

	import Foundation

	enum timingFunction{
	case Linear,EaseIn,EaseOut,EaseInOut,
	Spring,
	EaseInSine,EaseOutSine,EaseInOutSine,
	EaseInQuad,EaseOutQuad,EaseInOutQuad,
	EaseInCubic,EaseOutCubic,EaseInOutCubic,
	EaseInQuart,EaseOutQuart,EaseInOutQuart,
	EaseInQuint,EaseOutQuint,EaseInOutQuint,

	#!/usr/bin/env perl

	#
	# licensed under GPL v2, same as iTerm2 https://www.iterm2.com/license.txt
	#

	use strict;
	use JSON;

	my $output = $ENV{HOME} . "/Library/Application\ Support/iTerm2/DynamicProfiles/profiles.json";

	{
	"presets": ["react-native"]
	}