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() method

# declaring Hash value
a = { "a" => 100, "b" => 200 }

# declaring Hash value
b = {"a" => 100}


# block condition
# fetch? Value
puts "Hash a fetch_values form : #{a.fetch_values("x"){|k| k.upcase}}\n\n"

Output :

Hash a fetch_values form : ["X"]

Example #2 :

# Ruby code for Hash.fetch_values() 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_values Value
puts "Hash a fetch_values form : #{a.fetch_values("a")}\n\n"

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

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

Output :

Hash a fetch_values form : [100]

Hash b fetch_values form : [100]

Hash c fetch_values form : [200]