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Ruby | Hash reject method
  • Last Updated : 07 Jan, 2020
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Hash#reject() is a Hash class method which returns a new hash which consists of entries for which the block returns false.

Syntax: Hash.reject()

Parameter: Hash values

Return: new hash which consists of entries for which the block returns false.
enumerator – If no block is given

Example #1 :






# Ruby code for Hash.reject() method
  
# declaring Hash value
a = { "a" => 100, "b" => 200 }
  
# declaring Hash value
b = {"a" => 100}
  
# declaring Hash value
c = {"a" => 100, "c" => 300, "b" => 200}
  
  
# reject Value
puts "Hash a reject form : #{a.reject {|key, value| key < "b"}}\n\n"
  
puts "Hash b reject form : #{b.reject{|key, value| value < 200}}\n\n"

Output :

Hash a reject form : {"b"=>200}

Hash b reject form : {}

Example #2 :




# Ruby code for Hash.reject() method
  
# declaring Hash value
b = {"a" => 100}
  
# declaring Hash value
c = {"a" => 100, "c" => 300, "b" => 200}
  
  
# reject Value
  
puts "Hash b reject form : #{b.reject{|key, value| value < 200}}\n\n"
  
puts "Hash c reject form : #{c.reject{|key, value| key < "b"}}\n\n"

Output :

Hash b reject form : {}

Hash c reject form : {"c"=>300, "b"=>200}

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