Open In App

Ruby | Hash rehash function

Improve
Improve
Like Article
Like
Save
Share
Report

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}



Last Updated : 07 Jan, 2020
Like Article
Save Article
Previous
Next
Share your thoughts in the comments
Similar Reads