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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 :



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# 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"

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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 :

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# 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"

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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"}

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