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"
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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"
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Output :
Hash a fetch form : 100 Hash b fetch form : 100 Hash c fetch form : 200