TECH601-00 Day 5 Example - Lists of Countries

countries.rb

# an empty list of countries
countries = []

# `push` a country on to the list
countries.push({
  "id" => "AGO",
  "name" => "Angola",
  "population" => 21_471_618,
  "capital" => "Luanda",
  "latitude" => -8.81155,
  "longitude" => 13.242,
  "income_level" => "Upper Middle",
  "high_income" => false
})

countries.push({
  "id" => "ATG",
  "name" => "Antigua and Barbuda",
  "population" => 89_985,
  "capital" => "Saint John's",
  "latitude" => 17.1175,
  "longitude" => -61.8456,
  "income_level" => "High",
  "high_income" => true
})

countries.push({
  "id" => "BLR",
  "name" => "Belarus",
  "population" => 9_466_000,
  "capital" => "Minsk",
  "latitude" => 53.9678,
  "longitude" => 27.5766,
  "income_level" => "Upper Middle",
  "high_income" => false
})

countries.push({
  "id" => "CAF",
  "name" => "Central African Republic",
  "population" => 4_616_417,
  "capital" => "Bangui",
  "latitude" => 5.63056,
  "longitude" => 21.6407,
  "income_level" => "Low",
  "high_income" => false
})

countries.push({
  "id" => "CHE",
  "name" => "Switzerland",
  "population" => 8_081_482,
  "capital" => "Bern",
  "latitude" => 46.948,
  "longitude" => 7.44821,
  "income_level" => "High",
  "high_income" => true
})

# Output a populated list of countries
# puts countries

# Output a subset list of countries
# puts countries.slice(1)
# puts countries[1]
# puts countries.slice(1..3)
# puts countries[1..3]
# puts countries.slice(1, 3)

# Reverse the list
# puts countries.reverse.last
# puts countries.reverse.first
# puts countries.reverse.first["name"]

# Sort the countries by population - lowest to highest
countries_by_population = countries.sort_by do |country|
  country["population"]
end

# Output each country, ordered by population
countries_by_population.each do |country|
  puts "#{country["name"]} population is #{country["population"]}"
end

This is the answer I got:
Antigua and Barbuda population is 89985
Central African Republic population is 4616417
Switzerland population is 8081482
Belarus population is 9466000
Angola population is 21471618

@NevadaKiran 👍