Ruby/Statement/case

# you assign the result of whichever inner block is executed directly to color.
fruit = "orange"
color = case fruit
  when "orange"
    "orange"
  when "apple"
    "green"
  when "banana"
    "yellow"
  else
    "unknown"
end

#!/usr/bin/env ruby
scale = 8
case scale
  when    0: puts "lowest"
  when 1..3: puts "medium-low"
  when 4..5: puts "medium"
  when 6..7: puts "medium-high"
  when 8..9: puts "high"
  when   10: puts "highest"
  else       puts "off scale"
end

string = "123"
case string
    when /^[a-zA-Z]+$/
      "Letters"
    when /^[0-9]+$/
      "Numbers"
    else
      "Mixed"
end
# => "Numbers"

fruit = "orange"
if fruit == "orange"
  color = "orange"
elsif fruit == "apple"
  color = "green"
elsif fruit == "banana"
  color = "yellow"
else
  color = "unknown"
end
 
fruit = "orange"
case fruit
  when "orange"
    color = "orange"
  when "apple"
    color = "green"
  when "banana"
    color = "yellow"
  else
    color = "unknown"
end

case value
  when expression [, comparison]...[then | :]
    code
  when expression [, comparison]...[then | :]
    code
  .
  .
  .
  [else
    code]
end

command = "Stop"
case command
when "Go"
  puts "Going"
when "Wait"
  puts "Waiting"
when "Turn"
  puts "Turning"
when "Stop"
  puts "Stopping"
else
  puts "I can"t understand that."
end
# This example also could be written as an if statement with a collection of elsif and else clauses:
command = "Stop"
if command == "Go"
  puts "Going"
elsif command == "Wait"
  puts "Waiting"
elsif command == "Turn"
  puts "Turning"
elsif command == "Stop"
  puts "Stopping"
else
  puts "I can"t understand that."
end

temperature = 76
message = case
when (0...65) === temperature
  "Too cold!"
when (85...120) === temperature
  "Too hot!"
when (65...85) === temperature
  "Picnic time!"
else
  "Temperature out of reasonable range!"
end
puts message

temperature = 76
case temperature
when 0...65
  puts "Too cold!"
when 85...120
  puts "Too hot!"
when 65...85
  puts "Picnic time!"
else
  puts "Temperature out of reasonable range!"
end

command = "Stop"
 
case command
when "Go"
  puts "Going"
when "Wait"
  puts "Waiting"
when "Turn"
  puts "Turning"
when "Stop"
  puts "Stopping"
else
  puts "I can"t understand that."
end