Hash#key?() is a Hash class method which checks whether the key corresponding to the value is present or not.
Syntax: Hash.key?()
Parameter: Hash values
Return: true – if key corresponding to the value is present otherwise return false
Example #1 :
# Ruby code for Hash.key?() method # declaring Hash value a = {"a" => 100, "b" => 200}
# declaring Hash value b = {a:100, c:300, b:200}
# declaring Hash value c = {a:100}
# key? Value puts "Hash a key? form : #{a.key?("a")}\n\n"
puts "Hash b key? form : #{b.key?("c")}\n\n"
puts "Hash c key? form : #{c.key?("a")}\n\n"
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Output :
Hash a key? form : true Hash b key? form : false Hash c key? form : false
Example #2 :
# Ruby code for Hash.key?() 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}
# key? Value puts "Hash a key? form : #{a.key?("a")}\n\n"
puts "Hash b key? form : #{b.key?("c")}\n\n"
puts "Hash c key? form : #{c.key?("a")}\n\n"
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Output :
Hash a key? form : true Hash b key? form : false Hash c key? form : true