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如果和除非

Created: November-22, 2018

if true do
    "Will be seen since condition is true."
end    

if false do
    "Won't be seen since condition is false."
else
    "Will be seen.
end

unless false do
    "Will be seen."
end

unless true do 
    "Won't be seen."
else
    "Will be seen."
end
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