Ruby | Hash reject! method
Last Updated :
07 Jan, 2020
Hash#reject!() is a Hash class method which checks whether any changes are made in the hash array or not
Syntax: Hash.reject!()
Parameter: Hash values
Return: true – if changes are made otherwise return false
Example #1 :
a = { "a" => 100 , "b" => 200 }
b = { "a" => 100 }
c = { "a" => 100 , "c" => 300 , "b" => 200 }
puts "Hash a reject! form : #{a.reject! {|key, value| key < " b "}}\n\n"
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Output :
Hash a reject! form : {"b"=>200}
Example #2 :
b = { "a" => 100 }
c = { "a" => 100 , "c" => 300 , "b" => 200 }
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"
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Output :
Hash b reject! form : {}
Hash c reject! form : {"c"=>300, "b"=>200}
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