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Ruby | Hash fetch function

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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, "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 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



Last Updated : 07 Jan, 2020
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