index.rb

# def random_method(num, num2)
#   num * 10
#   # => 100
# end 

# p random_method(10, 100)

# while true 
#   p "hello"
# end

# until false
#   p "hello"
# end

# i = 1

# while i < 4
#   puts i 
#   i = i + 1
# end 

# good_music = ["rap", "country", "pop"]

# for genre in good_music
#   print genre
#   # something
#   break if genre == "country"
#   print ","
# end 

# "string"
# 1
# 1.1
# true
# [1,2,3]
# nil

# .class

# greeting = :hello
# p greeting

# b = "my_string"
# a = "my_string"
# p a.object_id
# p b.object_id

# c = :hello
# d = :hello
# p c.object_id
# p d.object_id

# what is a data structure?
# - where you store data, more than one piece of data
# - one piece of data just goes in a single variable
# - arrays, is a data structure for similar types of data
# colors = ["red","ff0000" "blue", "green"]

# hash is another data structure

# old syntax
# red = {
#   :color_name => "red",
#   :hex => "ff0000"
# }

# new syntax
red = {
  color_name: "red",
  hex: "ff0000",
  primary_color: true
}

# purple = {
#   color_name: "purple",
#   hex: "ff00ff",
#   primary_color: false
# }

# arr = [1,2,3]
# p arr[2]
# => 3

purple = {
  color_name: "purple",
  hex: "ff00ff",
  primary_color: false,
  things: [
    "rainbow",
    "grapes",
    "fremantle dockers"
  ]
}

# p purple[:things]

# numbers = { 1 => "one", "2" => "two" }

# p numbers

# numbers = { 1 => "one", "2" => "two" }

# numbers.each do |key, value|
#   p key
# end

# numbers = ["one", "two", "three", "four"]
# counter = 1

# numbers.map! do |number|
#   number = number + counter.to_s
#   counter = counter + 1
#   number
# end 

# p numbers
# => ["one1", "two2", "three3", "four4"]

# .each 

def my_each(array) 
  index = 0
  while index < array.length
    yield(array[index])
    index = index + 1
  end 
  return "hello"
end

result = my_each([1,2,3]) do |number|
  puts number
end 

p result
# => "hello"

# CRUD

# create
# read
# update
# delete