TECH601-00 Day 4 - Hash exercises with country data

countries.rb

# DRY this up!
# DRY - Don't Repeat Yourself! :)

# Data Type vs. Data Structure
# 
# New Data Type: Hash (or dictionary)
# A Hash is a Data Structure


# Angola:

country0_id = "AGO"
country0_name = "Angola"
country0_population = 21_471_618
country0_capital = "Luanda"
country0_latitude = -8.81155
country0_longitude = 13.242
country0_income_level = "Upper Middle"
country0_high_income = false

country0 = {
  "id"           => "AGO",
  "name"         => "Angola",
  "population"   => 21_471_618,
  "capital"      => "Luanda",
  "latitude"     => -8.81155,
  "longitude"    => 13.242,
  "income_level" => "Upper Middle",
  "high_income"  => false
}

puts country0["name"]
puts country0["population"]
puts country0

# ask for a non-existent key
puts country0["foo"]

# insert something new in to the dictionary
country0["foo"] = "bar"

# the value now exists
puts country0
puts country0["foo"]

# check out the keys, then the values
puts country0.keys.to_s
puts country0.values.to_s

puts country0.keys.count
puts country0.keys.length
puts country0.keys.size

puts country0.values.count
puts country0.values.length
puts country0.values.size

puts country0.keys.sort

# Antigua and Barbuda:
country1_id = "ATG"
country1_name = "Antigua and Barbuda"
country1_population = 89_985
country1_capital = "Saint John's"
country1_latitude = 17.1175
country1_longitude = -61.8456
country1_income_level = "High"
country1_high_income = true

# Belarus:
country2_id = "BLR"
country2_name = "Belarus"
country2_population = 9_466_000
country2_capital = "Minsk"
country2_latitude = 53.9678
country2_longitude = 27.5766
country2_income_level = "Upper Middle"
country2_high_income = false

# Central African Republic:
country3_id = "CAF"
country3_name = "Central African Republic"
country3_population = 4_616_417
country3_capital = "Bangui"
country3_latitude = 5.63056
country3_longitude = 21.6407
country3_income_level = "Low"
country3_high_income = false

# Switzerland:
country4_id = "CHE"
country4_name = "Switzerland"
country4_population = 8_081_482
country4_capital = "Bern"
country4_latitude = 46.948
country4_longitude = 7.44821
country4_income_level = "High"
country4_high_income = true

# is country4 population greater than country 1
# puts country4_population > country1_population

# output all of the country ids
# puts country0_id, country1_id, country2_id, country3_id, country4_id