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Method for checking bank account existence in the list of them.

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This commit is contained in:
Dominik Pantůček 2023-04-08 19:22:50 +02:00
parent 4c25246fe7
commit 6b8bffdd41
1 changed files with 13 additions and 0 deletions
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13
src/bank-account.scm
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@ -44,6 +44,8 @@
bank-transaction-type
bank-transaction-account
bank-transaction-bank
bank-accounts-member?
)
(import scheme
@ -85,4 +87,15 @@
(bank-transaction-message tr)
(bank-transaction-type tr))))
;; Returns true if given acc/bc is in the list of accounts
(define (bank-accounts-member? bas acc bc)
(let loop ((bas bas))
(if (null? bas)
#f
(let ((ba (car bas)))
(if (and (equal? acc (bank-account-number ba))
(equal? bc (bank-account-bank ba)))
#t
(loop (cdr bas)))))))
)