On 5/30/16 6:47 PM, Andreas Joseph Krogh wrote:
Then I use the ⊛ operator to accumulate errors:
(checkInvoiceNumber ⊛ checkSentDate ⊛ checkCompany ⊛
checkSourceCompany ⊛ checkInvoiceSource ⊛ checkBankAccount ⊛
checkCustAddressStreet ⊛ checkCustAddressPlace ⊛ checkCustAddressCity
⊛ checkCustAddressZip ⊛ checkSenderAddressStreet ⊛
checkSenderAddressPlace ).tupled match { case Failure(msgList) =>
prinln(msgList)case Success((invoiceNumber, invoiceDate, company,
sourceComp, invoiceSource, fromBankAccount , custAddrStreet,
custAddrPlace, custAddrCity, custAddrZip , senderAddrStreet,
senderAddrPlace )) =>
This approach stops working when having more then 12 checks (because
ApplicativeBuilder12 is the "last one").
How can I accomplish the same using a List of any length, preserving
the types in Success so I can use them like the match-statement above?
The simplest way is to add more parentheses and .tupled calls. Then you
can add more parentheses in the same places to your case Success, and
the pattern match should work just as well.
There is an hlist approach that is less ad hoc, but requires more setup;
I'd suggest it only if you are already incorporating hlists into your code.
Greetings,
Stephen.
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