Ruby | Hash keys() function - GeeksforGeeks (2024)

Ruby | Hash each_pair() function

Hash#each_pair() is a Hash class method which finds the nested value which calls block once for each pair in hash by passing the key_value pair as parameters. Syntax: Hash.each_pair() Parameter: Hash values Return: calls block once for key_value pair in hash with key_value pair as parameter otherwise Enumerator if no argument is passed. Example #1

Ruby | Hash to_s() function

Hash#to_s() is a Hash class method which gives the string representation of hash. Syntax: Hash.to_s() Parameter: Hash values Return: string representation of hash Example #1 : # Ruby code for Hash.to_s() 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} # to_s Value

Ruby | Hash invert() function

Hash#invert() is a Hash class method which gives the hash by reverting keys to values and values to key. Syntax: Hash.invert() Parameter: Hash values Return: hash by reverting keys to values and values to key Example #1 : # Ruby code for Hash.invert() method # declaring Hash value a = {a:100, b:200} # declaring Hash value b = {a:100, c:300, b:200}

Ruby | Hash include?() function

Hash#include?() is a Hash class method which checks whether the given key is present in hash. Syntax: Hash.include?() Parameter: Hash values Return: true - if given key"" is present in hash otherwise return false Example #1 : # Ruby code for Hash.has_value?() method # declaring Hash value a = {a:100, b:200} # declaring Hash value b = {a:100, c:300,

Ruby | Hash inspect() function

Hash#inspect() is a Hash class method which gives the string representation of hash. Syntax: Hash.inspect()Parameter: Hash valuesReturn: string representation of the hash Example #1 : C/C++ Code # Ruby code for Hash.inspect() method # declaring Hash value a = {a:100, b:200} # declaring Hash value b = {a:100, c:300, b:200} # declaring Hash value c =

Ruby | Array class hash() function

hash() is an Array class method which returns the hash code of the array elements Syntax: Array.hash() Parameter: Array Return: hash code of the array elements Example #1 : # Ruby code for hash() method # declaring array a = [18, 22, 33, nil, 5, 6] # declaring array b = [1, 4, 1, 1, 88, 9] # declaring array c = [18, 22, nil, nil, 50, 6] # hash puts

Ruby | Hash rassoc() function

rassoc() is an Hash class method which searches an element through the Hash value. Syntax: Hash.rassoc() Parameter: Hashs for finding elements. Return: searches an element through the Hash value Example #1: # Ruby code for rassoc() method # declaring Hash value a = { "a" => "abc", "b" => "200" } # decla

Ruby | Hash delete_if() function

delete_if() is a Hash class method which delete_if the key-value pair if the block condition is true Syntax: Hash.delete_if() Parameter: Hash array Block Condition Return: value from hash whose key is equal to delete_ifd key. Example #1: # Ruby code for delete_if() method # declaring Hash value a = { "a" => 100, "b" => 200

Ruby | Hash delete() function

delete() is an Hash class method which deletes the key-value pair and returns the value from hash whose key is equal to key. Syntax: Hash.delete() Parameter: Hash array Return: value from hash whose key is equal to deleted key. Example #1: # Ruby code for delete() method # declaring Hash value a = { "a" => 100, "b" => 200

Ruby | Hash compare_by_identity? () function

compare_by_identity? () is a Hash class method which checks the comparison of the hash key with its identity and considers exact same objects as same keys Syntax: Hash.compare_by_identity? () Parameter: Hash array Return: true if hash will compare its keys by their identity otherwise false Example #1: # Ruby code for compare_by_identity? () method

Ruby | Hash compact!() function

compact! () is a Hash class method which returns the Hash after removing all the 'nil' value elements (if any) from the Hash. If there are no nil values in the Hash it returns back the nil value. Syntax: Hash.compact!() Parameter: Hash to remove the 'nil' value from. Return: removes all the nil values from the Hash. nil - if there is no nil value i

Ruby | Hash compact() function

compact () is a Hash class method which returns the Hash after removing all the 'nil' value elements (if any) from the Hash. Syntax: Hash.compact() Parameter: Hash to remove the 'nil' value from. Return: removes all the nil values from the Hash. Example #1: # Ruby code for compact() method # showing how to remove nil values # declaring Hash value a

Ruby | Hash clear() function

clear() is an Hash class method which removes all the Hash elements from it. Syntax: Hash.clear() Parameter: Hashs to clear off Return: Hash with all elements cleared Example #1: # Ruby code for clear() 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} puts "cle

Ruby | Hash assoc() function

assoc() is an Hash class method which searches an element through the Hash. Syntax: Hash.assoc() Parameter: Hashs for finding elements. Return: searches an element through the Hash Example #1: # Ruby code for assoc() method # declaring Hash value a = { "a" => 100, "b" => 200 } # declaring Hash value c = {"a" =

Ruby | Hash any?() function

any?() is a Hash class method which checks for the presence of a pattern and passes each element of the collection to the given block. Syntax: Hash.any?() Parameter: Hash for testing Return: true - if the block ever returns a value other than false or nil otherwise return false Example #1: # Ruby code for any?() method # declaring Hash value a = {

Ruby | Hash compare_by_identity () function

Hash#compare_by_identity () is an Hash class method which compares the hash key with its identity and consider exact same objects as same keys. Syntax: Hash.compare_by_identity () Parameter: Hash array Return: compares the hash key with its identity Example #1 : # Ruby code for compare_by_identity () method # declaring Hash value a = {a:100, b:nil}

Ruby | Hash flatten() function

Hash#flatten() is a Hash class method which returns the one-dimensional flattening hash array. Syntax: Hash.flatten() Parameter: Hash values Return: one-dimensional flattening hash array Example #1 : # Ruby code for Hash.flatten() method # declaring Hash value a = {a:100, b:200} # declaring Hash value b = {a:100, c:[300, 45], b:200} # declaring Has

Ruby | Hash fetch_values() function

Hash#fetch_values() is a Hash class method which returns array containing the values associated with the given keys. With no other arguments, it will raise a KeyError exception. Syntax: Hash.fetch_values() Parameter: Hash values Return: array containing the values associated with the given keys Example #1 : # Ruby code for Hash.fetch_values() metho

Ruby | Hash fetch function

Hash#fetch() is a Hash class method which returns a value from the hash for the given key. With no other arguments, it will raise a KeyError exception. Syntax: Hash.fetch() Parameter: Hash values Return: value from the hash for the given key Example #1 : # Ruby code for Hash.fetch() method # declaring Hash value a = { "a" => 100,

Ruby | Hash eql? function

Hash#eql?() is a Hash class method which checks whether the two Hash arrays are equal or not. Syntax: Hash.eql?() Parameter: Hash values Return: true - if two hash arrays are equal otherwise return false Example #1 : # Ruby code for Hash.eql?() method # declaring Hash value a = {a:100, b:200} # declaring Hash value b = {a:100, c:300, b:200} # decla

Ruby | Hash empty? function

Hash#empty?() is a Hash class method which checks whether the Hash array has any key-value pair. Syntax: Hash.empty?()Parameter: Hash valuesReturn: true - if no key value pair otherwise return false Example #1 : C/C++ Code # Ruby code for Hash.empty?() method # declaring Hash value a = {a:100, b:200} # declaring Hash value b = {a:100, c:300, b:200}

Ruby | Hash each_key function

Hash#each_key() is a Hash class method which finds the nested value which calls block once for each_key pair in the hash by passing the key as parameters. Syntax: Hash.each_key() Parameter: Hash values Return: calls block once for key_value pair in hash with key as a parameter otherwise, Enumerator if no argument is passed. Example #1 : # Ruby code

Ruby | Hash each_key() function

Hash#each_key() is a Hash class method which finds the nested value which calls block once for each_key key in hash by passing the key pair as parameters. Syntax: Hash.each_key() Parameter: Hash values Return: calls block once for each_key key in hash with key as parameter otherwise Enumerator if no argument is passed. Example #1 : # Ruby code for

Ruby | Hash each() function

Hash#each() is a Hash class method which finds the nested value which calls block once for each key in hash by passing the key-value pair as parameters. Syntax: Hash.each() Parameter: Hash values Return: calls block once for each key in hash otherwise Enumerator if no argument is passed. Example #1 : # Ruby code for Hash.each() method # declaring H

Ruby | Hash dig() function

Hash#dig() is a Hash class method which finds the nested value which is specified by the sequence of the key object by calling dig at each step. Syntax: Hash.dig() Parameter: Hash values Return: nested value which is specified by the sequence of the key object by calling dig at each step. otherwise nil Example #1 : # Ruby code for Hash.dig() method

Ruby | Hash has_value?() function

Hash#has_value?() is a Hash class method which checks whether the given value is present in hash. Syntax: Hash.has_value?() Parameter: Hash values Return: true - if given value is present in hash otherwise return false Example #1 : # Ruby code for Hash.has_value?() method # declaring Hash value a = {a:100, b:200} # declaring Hash value b = {a:100,

Ruby | Hash keep_if() function

Hash#keep_if() is a Hash class method which only keeps those key value pair that follows the block condition. Syntax: Hash.keep_if() Parameter: Hash values block - condition Return: key value pair that follows the block condition Example #1 : # Ruby code for Hash.keep_if() method # declaring Hash value a = {a:100, b:200} # declaring Hash value b =

Ruby | Hash key() function

Hash#key() is a Hash class method which gives the key value corresponding to the value. If value doesn't exist then return nil. Syntax: Hash.key() Parameter: Hash values Return: key corresponding to the value nil - If value doesn't exist Example #1 : # Ruby code for Hash.key() method # declaring Hash value a = {a:100, b:200} # declaring Hash value

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"

Ruby | Hash has_key?() function

Hash#has_key?() is a Hash class method which checks whether the given key is present in hash. Syntax: Hash.has_key?() Parameter: Hash values Return: true - if the key is present otherwise return false Example #1 : # Ruby code for Hash.has_key?() method # declaring Hash value a = {a:100, b:200} # declaring Hash value b = {a:100, c:300, b:200} # decl