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I want to print a key from a given hash key but I can't find a simple solution:
myhash = Hash.new
myhash["a"] = "bar"
# not working
myhash.fetch("a"){|k| puts k }
# working, but ugly
if myhash.has_key("a")?
puts "a"
end
Is there any other way?
395
We can done this by using map function. map {print "$_\n"} keys %hash; map function process its statement for every keys in the hash.
print "$ perl_print_hash_variable{'-hash_key2'} \n"; Description: The Perl print hash can used $ symbol for a single hash key and its value. The Perl print hash can use the % symbol for multiple hash keys and their values.
We can check if a particular hash contains a particular key by using the method has_key?(key) . It returns true or false depending on whether the key exists in the hash or not.
Answer: The hashing key is the raw data in which to be hashed. The hashing algorithm is the algorithm which performs a function to convert the hash key to the hash value. the hash value is what is produced as a result of the hash key being passed into the hashing algorithm.
To get all the keys from a hash use the keys method:
{ "1" => "foo", "2" => "bar" }.keys
=> ["1", "2"]
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