array exercises
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# Two alternative approaches for https://gist.github.com/peeyush14goyal/506689c0227ff7d7a6071c30f1166a27 | |
todos = [ | |
["Send invoice", "money"], | |
["Clean room", "organize"], | |
["Pay rent", "money"], | |
["Arrange books", "organize"], | |
["Pay taxes", "money"], | |
["Buy groceries", "food"] | |
] | |
categories = todos.map {|todo| todo[1] }.uniq | |
# A functional approach | |
categories.each do |category| | |
puts "#{category}:" | |
todo_names = | |
todos.filter {|todo| todo[1] == category}. | |
map {|todo| " #{todo[0]}"}. | |
join("\n") | |
puts todo_names | |
end | |
# A more imperative approach | |
categories.each do |category| | |
puts "#{category}:" | |
todos_for_this_category = todos.filter {|todo| todo[1] == category} | |
todos_for_this_category.each do |todo| | |
puts " #{todo[0]}" | |
end | |
end |
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