Ruby | Hash fetch function

Ruby | Hash fetch function

Last Updated : 07 Jan, 2020

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

# Ruby code for Hash.fetch() 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}

# Handling no key argument
# fetch? Value
puts "Hash a fetch form : #{a.fetch("x"){|el| "Not present, #{el}"}}\n\n"

Output :

Hash a fetch form : Not present, x

Example #2 :

Ruby

# Ruby code for Hash.fetch() 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}

# fetch Value
puts "Hash a fetch form : #{a.fetch("a")}\n\n"

puts "Hash b fetch form : #{b.fetch("a")}\n\n"

puts "Hash c fetch form : #{c.fetch("b")}\n\n"

Output :

Hash a fetch form : 100

Hash b fetch form : 100

Hash c fetch form : 200

Ruby | Hash fetch function

K

Kirti_Mangal

Improve

Article Tags :

Similar Reads

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 | Hash empty? function

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

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 Exam

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 # Ruby code for Hash.eql?() method # declaring Hash value a = {a:100, 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 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

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

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 # Ruby code for delete() method # declaring Hash value

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 otherwis

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 # Ruby code for Hash.flatten() method # declaring Hash value a = {a:100, b:200} # declaring Has

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