aruprakshit

Redux containers: mapDispatchToProps

This document details some tips and tricks for creating redux containers. Specifically, this document is looking at the mapDispatchToProps argument of the connect function from [react-redux][react-redux]. There are many ways to write the same thing in redux. This gist covers the various forms that mapDispatchToProps can take.

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Redux Selector Pattern

Imagine we have a reducer to control a list of items:

function listOfItems(state: Array<Object> = [], action: Object = {}): Array<Object> {
  switch(action.type) {
    case 'SHOW_ALL_ITEMS':
      return action.data.items
    default:

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development:
  adapter: postgresql
  encoding: utf8
  database: campflame_development
  pool: 5
  host: ''

test:
  adapter: postgresql
  encoding: utf8

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# Postgresql fancy datatypes!

* array
* hstore (=~ hash)
* json
* jsonb


  Philippe Creux - [@pcreux](http://twitter.com/pcreux)

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Multiple SSH Keys settings for different github account

create different public key

create different ssh key according the article Mac Set-Up Git

$ ssh-keygen -t rsa -C "your_email@youremail.com"

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class PurchaseApprover
  # Implements the chain of responsibility pattern. Does not know anything
  # about the approval process, merely whether the current handler can approve
  # the request, or must pass it to a successor.
  attr_reader :successor

  def initialize successor
    @successor = successor
  end

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class CarElement
  def accept(visitor)
    raise NotImpelementedError.new
  end
end

module Visitable
  def accept(visitor)
    visitor.visit(self)
  end

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#!/usr/bin/ruby -w

FILE_NAME = "x"

printf "%-20s %p\n%-20s %p\n",
  "Default external", Encoding.default_external,
  "Default internal", Encoding.default_internal

# p File.instance_methods.grep(/enc|opt/)

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# lib/tasks/db.rake
namespace :db do

  desc "Dumps the database to db/APP_NAME.dump"
  task :dump => :environment do
    cmd = nil
    with_config do |app, host, db, user|
      cmd = "pg_dump --host #{host} --username #{user} --verbose --clean --no-owner --no-acl --format=c #{db} > #{Rails.root}/db/#{app}.dump"
    end
    puts cmd

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for app in $(heroku apps); do heroku apps:destroy --app $app --confirm $app; done