Ruby | Hash invert() function

Ruby | Hash invert() function

Last Updated : 07 Jan, 2020

Hash#invert() is a Hash class method which gives the hash by reverting keys to values and values to key.

Syntax: Hash.invert() Parameter: Hash values Return: hash by reverting keys to values and values to key

Example #1 :

Ruby

# Ruby code for Hash.invert() method

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

# declaring Hash value
b = {a:100, c:300, b:200}

# declaring Hash value
c = {a:100}


# invert Value
puts "Hash a invert form : #{a.invert()}\n\n"

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

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

Output :

Hash a invert form : {100=>:a, 200=>:b}

Hash b invert form : {100=>:a, 300=>:c, 200=>:b}

Hash c invert form : {100=>:a}

Example #2 :

Ruby

# Ruby code for Hash.invert() 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}


# invert Value
puts "Hash a invert form : #{a.invert()}\n\n"

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

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

Output :

Hash a invert form : {100=>"a", 200=>"b"}

Hash b invert form : {100=>"a"}

Hash c invert form : {100=>"a", 300=>"c", 200=>"b"}

Ruby | Hash invert() function

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