Javieratapiab

I was able to get Ruby 2.5.1 building on M1 by following two of the steps in that GH issue...

rbenv/ruby-build#1691 (comment) rbenv/ruby-build#1691 (comment)

I installed readline and openssl with standard brew install.

brew install readline
brew install openssl

Javieratapiab

Tabs and Windows

Function	Shortcut
New Tab	⌘ + T
Close Tab or Window	⌘ + W (same as many mac apps)
Go to Tab	⌘ + Number Key (ie: ⌘2 is 2nd tab)
Go to Split Pane by Direction	⌘ + Option + Arrow Key
Cycle iTerm Windows	⌘ + backtick (true of all mac apps and works with desktops/mission control)

Javieratapiab

http://stackoverflow.com/questions/22667401/postgres-json-data-type-rails-query
http://stackoverflow.com/questions/40702813/query-on-postgres-json-array-field-in-rails

#payload: [{"kind"=>"person"}]
Segment.where("payload @> ?", [{kind: "person"}].to_json)

#data: {"interest"=>["music", "movies", "programming"]}
Segment.where("data @> ?",  {"interest": ["music", "movies", "programming"]}.to_json)
Segment.where("data #>> '{interest, 1}' = 'movies' ")
Segment.where("jsonb_array_length(data->'interest') > 1")

Javieratapiab

Run rails new --help to view all of the options you can use to generate new Rails application:

Output for Rails 6+

Usage:
  rails new APP_PATH [options]

Options:
      [--skip-namespace], [--no-skip-namespace]              # Skip namespace (affects only isolated applications)

Javieratapiab

package project;

class MiClase4<T> {
  // Atributos
  private T attr1;

  // Constructor
  public MiClase4(T attr1) {
    this.attr1 = attr1;
  }

Javieratapiab

Installing Postgres via Brew

Pre-Reqs

Brew Package Manager

In your command-line run the following commands:

1. brew doctor
2. brew update

Javieratapiab

; Aspectos imperativos
; IF CONDICION CASO_VERDADERO CASO_FALSO
(if (>= 3 0) "positivo" "negativo")
; => positivo

; Etiquetando una función
(define sucesor (lambda (n) (+ n 1)))

; Composición de funciones en Scheme
(define f (lambda (x) (* x 2)))

Javieratapiab

### THE WRONG WAY ###
starting = Time.now
# time consuming operation
ending = Time.now
elapsed = ending - starting
elapsed # => 10.822178
#####################

### THE GOOD WAY ###
starting = Process.clock_gettime(Process::CLOCK_MONOTONIC)

Javieratapiab

Project Title

One Paragraph of project description goes here

Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. See deployment for notes on how to deploy the project on a live system.

Prerequisites

Javieratapiab

PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h):

• -E: will describe the underlaying queries of the \ commands (cool for learning!)
• -l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)