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.
Ruby
Output :
Ruby
Output :
Syntax: Hash.fetch() Parameter: Hash values Return: value from the hash for the given keyExample #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"
Hash a fetch form : Not present, xExample #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"
Hash a fetch form : 100 Hash b fetch form : 100 Hash c fetch form : 200