CODEWITHSUNDEEP
ruby
Taoufik
Taoufik

Reputation: 296

Why change value in new hash affect the old hash

Assume we have

hash = { a: 1, b: 2 }
hash2 = hash.to_hash

when I change value in hash2 it affect value in hash

hash2[:a] = 5
# hash[:a] = 5

Why ruby acts like that ? How to fix this ?

Upvotes: 0

Views: 100

Answers (1)

Schwern
Schwern

Reputation: 164809

Calling to_hash on a Hash returns itself. hash and hash2 are the same object.

2.6.5 :001 > hash = { a: 1, b: 2 }
 => {:a=>1, :b=>2} 
2.6.5 :002 > hash2 = hash.to_hash
 => {:a=>1, :b=>2} 
2.6.5 :003 > hash.object_id
 => 70244375263800 
2.6.5 :004 > hash2.object_id
 => 70244375263800

Upvotes: 2

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