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Ruby | Hash rehash function
  • Last Updated : 07 Jan, 2020

Hash#rehash() : rehash() is a Hash class method which based on the current hash value rebuilds the hash for each key. This will reindex hash if the values of key objects have changed since they were inserted.

Syntax: Hash.rehash()

Parameter: Hash values

Return: based on the current hash value rebuilds the hash for each key

Example #1 :






# Ruby code for Hash.rehash() 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}
  
  
# rehash Value
puts "Hash a rehash form : #{a.rehash("a")}\n\n"
  
puts "Hash b rehash form : #{b.rehash("c")}\n\n"
  
puts "Hash c rehash form : #{c.rehash("a")}\n\n"

Output :

Hash a rehash form : false

Hash b rehash form : false

Hash c rehash form : false

Example #2 :




# Ruby code for Hash.rehash() 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}
  
  
# rehash Value
puts "Hash a rehash form : #{a.rehash()}\n\n"
  
puts "Hash b rehash form : #{b.rehash()}\n\n"
  
puts "Hash c rehash form : #{c.rehash()}\n\n"

Output :

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

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

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

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