ProgramGuruTo check if a key exists in a hash in Ruby, you can use the key? method. This method returns a boolean value indicating whether the hash contains the specified key.
We can check if a key exists in a hash in Ruby using the key? method, which returns true if the hash contains the specified key and false otherwise.
For example,
my_map with some key-value pairs. In this example, the hash has string keys and integer values.key? method to check for a specific key in the hash. The key? method returns a boolean value indicating whether the hash contains the specified key.puts function.my_map = {
'one' => 1,
'two' => 2,
'three' => 3
}
# Check if a key exists using key? method
key_exists = my_map.key?('two')
# Print the result
puts "Does key 'two' exist? #{key_exists}"Does key 'two' exist? true
We can check if a key does not exist in a hash in Ruby using the key? method, which returns false if the hash does not contain the specified key.
For example,
my_map with some key-value pairs. In this example, the hash has string keys and integer values.key? method to check for a specific key in the hash. The key? method returns a boolean value indicating whether the hash contains the specified key.puts function.my_map = {
'one' => 1,
'two' => 2,
'three' => 3
}
# Check if a key does not exist using key? method
key_exists = my_map.key?('four')
# Print the result
puts "Does key 'four' exist? #{key_exists}"Does key 'four' exist? false
We can check if multiple keys exist in a hash in Ruby using the key? method, which returns true if the hash contains the specified key and false otherwise.
For example,
my_map with some key-value pairs. In this example, the hash has string keys and integer values.key? method to check for multiple keys in the hash. The key? method returns a boolean value indicating whether the hash contains the specified key.puts function.my_map = {
'one' => 1,
'two' => 2,
'three' => 3
}
# Check if multiple keys exist using key? method
key_exists_one = my_map.key?('one')
key_exists_four = my_map.key?('four')
# Print the results
puts "Does key 'one' exist? #{key_exists_one}"
puts "Does key 'four' exist? #{key_exists_four}"Does key 'one' exist? true Does key 'four' exist? false
In this tutorial, we learned How to Check if a Key Exists in a Map in Ruby language with well detailed examples.