Hash#keys() is a Hash class method which gives an array with all the keys present in the hash.
Syntax: Hash.keys()
Parameter: Hash values
Return: array with all the keys present in the hash
Example #1 :
a = {a:100, b:200}
b = {a:100, c:300, b:200}
c = {a:100}
puts "Hash a keys form : #{a.keys()}\n\n"
puts "Hash b keys form : #{b.keys()}\n\n"
puts "Hash c keys form : #{c.keys()}\n\n"
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Output :
Hash a keys form : [:a, :b]
Hash b keys form : [:a, :c, :b]
Hash c keys form : [:a]
Example #2 :
a = { "a" => 100, "b" => 200 }
b = {"a" => 100}
c = {"a" => 100, "c" => 300, "b" => 200}
puts "Hash a keys form : #{a.keys()}\n\n"
puts "Hash b keys form : #{b.keys()}\n\n"
puts "Hash c keys form : #{c.keys()}\n\n"
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Output :
Hash a keys form : ["a", "b"]
Hash b keys form : ["a"]
Hash c keys form : ["a", "c", "b"]
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Last Updated :
07 Jan, 2020
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