Ruby：如何在Ruby块中使用Merge方法

Posted 2021-02-26

#The Merge method is for Hashes only.  
h1 = { "a" => 111, "b" => 222 }
h2 = { "b" => 333, "c" => 444 }
 
#Conflict resolution
puts h1.merge(h2) { |key, old_value, new_value| old_value }
puts h1.merge(h2) { |key, old_value, new_value| new_value }
 
 
#Longhand
puts h1.merge(h2) do |key, old_value, new_value|
  if old_value < new
    old_value
  else
    new_value
  end
end
 
#Shorthand
puts h1.merge(h2) { |k, o, n| o < n ? o : n }