Ruby | Hash key?() function

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"

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"

Output :

Hash a key? form : true

Hash b key? form : false

Hash c key? form : true