How to add new item to hash

Question

I m new to Ruby and don t know how to add new item to already existing hash  For example  first I construct hash   hash    item1  1    after that a want to add item2 so after this I have hash like this    item1  1  item2  2    I don t know what method to do on hash  could someone help me

User · Answer

hash items     item   gt  1  puts hash items   hash items will give you   item   gt  1   hash items merge    item   gt  2   puts hash items   hash items will give you   item   gt  1   item   gt  2   hash items merge   item   gt  2   puts hash items   hash items will give you   item   gt  1   item   gt  2   but the original variable will be the same old one

User · Answer

It s as simple as   irb main  001 0 gt  hash     item1   gt  1    gt    item1  gt 1  irb main  002 0 gt  hash  item2    2   gt  2 irb main  003 0 gt  hash   gt    item1  gt 1   item2  gt 2

User · Answer

hash key  value Associates the value given by value with the key given by key   hash  newKey     newValue    From Ruby documentation  http   www tutorialspoint com ruby ruby hashes htm

User · Answer

If you want to add new items from another hash - use merge method   hash     item1   gt  1  another hash     item2   gt  2   item3   gt  3  hash merge another hash      item1  gt 1   item2  gt 2   item3  gt 3    In your specific case it could be   hash     item1   gt  1  hash merge   item2   gt  2       item1  gt 1   item2  gt 2    but it s not wise to use it when you should to add just one element more   Pay attention that merge will replace the values with the existing keys   hash     item1   gt  1  hash merge   item1   gt  2       item1  gt 2    exactly like hash  item1    2  Also you should pay attention that merge method  of course  doesn t effect the original value of hash variable - it returns a new merged hash  If you want to replace the value of the hash variable then use merge  instead   hash     item1   gt  1  hash merge    item2   gt  2     now hash      item1  gt 1   item2  gt 2

User · Answer

hash store key  value  - Stores a key-value pair in hash   Example   hash      gt    a   gt 9   b   gt 200   c   gt 4  hash store  d   42     gt  42 hash      gt    a   gt 9   b   gt 200   c   gt 4   d   gt 42    Documentation

User · Answer

Create the hash   hash     item1   gt  1    Add a new item to it   hash  item2    2

User · Answer

Create hash as   h   Hash new   gt       Now insert into hash as   h   Hash  one    gt  1

[ruby] How to add new item to hash

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