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 :
a = {a: 100 , b: 200 }
b = {a: 100 , c: 300 , b: 200 }
c = {a: 100 }
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"
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Output :
Hash a rehash form : false
Hash b rehash form : false
Hash c rehash form : false
Example #2 :
a = { "a" => 100 , "b" => 200 }
b = { "a" => 100 }
c = { "a" => 100 , "c" => 300 , "b" => 200 }
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"
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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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