Hello all,

I am currently studying Clojure and wanted to make a bankaccount with 
reference, so I came up with the following approach:

(defprotocol IBankAccount
     (deposit [this amount])
     (widthraw [this amount])
     )


(defrecord bankAccount
                 [balance holder]
                 
                 ;implements the IBankAccount
                 IBankAccount
                 
                 (deposit [this amount] (dosync (alter (+ (:balance this) 
 amount))))
                 (widthraw [this amount] (dosync (alter (+ (:balance this) 
+ amount))))
)

And the balance needs to be a ref, I think I misunderstood somethingh but 
couldn 't find a clear answer about the use of dosync -> alter within a 
defrecord.


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