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04_arrays_and_hashes.rb
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04_arrays_and_hashes.rb
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#1. ACCESSING AND ELEMENT FROM AN ARRAY
#Display first post only
posts = ["post1", "post2", "post3"]
puts posts[0]
# 2. ADDING AN ELEMENT TO AN ARRAY
#add a new post to my collection of posts
posts = ["post1", "post2", "post3"]
posts << "post4"
puts posts
or
posts = ["post1", "post2", "post3"]
posts.push("post4")
puts posts
# 3. DELETING AN ELEMENT FROM AN ARRAY
#deleting one of my posts
posts = ["post1", "post2", "post3"]
posts.delete_at(1)
puts posts
# 4. CREATING A HASH
#restaurant menu: dusplay the dishes + prices
restaurant_menu = {
"Pizza" => "10€",
"Pasta" => "12€",
"Steak" => "18€"
}
puts restaurant_menu
restaurant_menu = Hash.new
restaurant_menu["Fish"] = "15€"
restaurant_menu["Desert"] = "6€"
puts restaurant_menu
# 5. ACCESSING A KEY-VALUE PAIR FROM A HASH
# online menu -> display the price for a specific dish
restaurant_menu = {
"Pizza" => "10€",
"Pasta" => "12€",
"Steak" => "18€"
}
puts restaurant_menu["Pizza"]
# 6. ADDING A KEY-VALUE PAIR TO A HASH
# add a new dish + price to the menu
restaurant_menu = {
"Pizza" => "10€",
"Pasta" => "12€",
"Steak" => "18€"
}
restaurant_menu["Fish"]=["15€"]
puts restaurant_menu
# 7. DELETING A KEY-VALUE PAIR FROM A HASH
# removing a dish + price from the menu
restaurant_menu = {
"Pizza" => "10€",
"Pasta" => "12€",
"Steak" => "18€"
}
restaurant_menu.delete("Pizza")
puts restaurant_menu
# 8. ITERATING OVER AN ARRAY
#displaying the main ingredient for each of our recipes
recipes = ["Leek", "Carrot", "Shrimp"]
recipes.each do |ingredient|
puts "Main ingredient for this recipe: #{ingredient}"
end
# 9. ITERATING OVER A MULTIDIMENSIONAL ARRAY
#displaying main ingredients for main dishes and for deserts
recipes = [["Leek", "Carrot", "Shrimp"],["Apple", "Pear", "Cheese"]]
recipes.each do |sub_array|
sub_array.each do |ingredient|
puts "Main ingredient for this recipe: #{ingredient}"
end
end
# 10. ITERATING OVER A HASH
# display the dishes + prices in a customized way
restaurant_menu = {
"Pizza" => "10€",
"Pasta" => "12€",
"Steak" => "18€"
}
restaurant_menu.each do |meal, price|
puts "#{meal} price is #{price}"
end