ruby - Return 0 when select returns nothing? -

Say I have an array of palm like:

  items = [[: User = & gt; 1,: zodiac = & gt; 484}, {: user = & gt; 2 ,: zodiac => 0}, {: user = & gt; 3 ,: zodiac = & gt; 8633}]   
 To get the  amount  for a user, I want something like this:  
  items.select { | Key | Key [: User] == 1}.   
 But if there is no ID then  is not user , then it will not work:  
  & Gt; Items.select {| Key | Key [: user] == 8}. First [: amount] # no methoder: Undefined method for zero, `]]: NilClass   
 how can I return the  amount  if it finds the item , But  0  is nothing back then   
 
 
 First of all, Instead you can use it because you want only the first match if you want the one-liner, then you can do something like this:  
  (items.find {| key | key [: user ] == 8} || {: zodiac => if you kick around Rails or ActiveSupport You can use it and  to_i  (while  remembering zero) To_i == 0 ) like this:  
  items.find {| K | Key [: user] == 1} .try (: fetch, amount) .to_i   
  Try  just calls a method ( fetch  in this case) but always returns  zero  if the receiver is  zero  then  is nil.try (: fetch, zodiac)   nothing  but  some_hash.try (: fetch, amount)  is  some_hash.fetch (amount) , it's an easy tool to swallow < Without needing to add a bunch of code> Zero  s. AFAIK,  andand  gem is required for all ActiveSupport Does the same things without.