Ruby | Hash each_key() 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 each_key() function

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