56 lines
1.2 KiB
Ruby
56 lines
1.2 KiB
Ruby
# create a mapping of state to abbreviation
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states = {
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"Oregon" => "OR",
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"Florida" => "FL",
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"California" => "CA",
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"New York" => "NY",
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"Michigan" => "MI"
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}
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# create a basic set of states and some cities in them
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cities = {
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"CA" => "San Francisco",
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"MI" => "Detroit",
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"FL" => "Jacksonville"
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}
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# add some more cities
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cities["NY"] = "New York"
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cities["OR"] = "Portland"
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# puts out some cities
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puts "-" * 10
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puts "NY State has: #{cities["NY"]}"
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puts "OR State has: #{cities["OR"]}"
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# do it by using the state then cities dict
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puts "-" * 10
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puts "Michigan has: #{cities[states["Michigan"]]}"
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puts "Florida has: #{cities[states["Florida"]]}"
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# puts every city in state
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puts "-" * 10
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cities.each do |abbrev, city|
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puts "#{abbrev} has the city #{city}"
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end
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# now do both at the same time
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puts "-" * 10
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states.each do |state, abbrev|
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city = cities[abbrev]
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puts "#{state} is abbreviated #{abbrev} and has city #{city}"
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end
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puts "-" * 10
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# by default ruby says "nil" when something isn't in there
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state = states["Texas"]
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if !state
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puts "Sorry, no Texas."
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end
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# default values using ||= with the nil result
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city = cities["TX"]
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city ||= "Does not exist"
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puts "The city for state 'TX' is: #{city}"
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