[Haskell-cafe] Evaluation of IO actions in record assignment

[Tillmann Rendel]

Adde wrote:
> signatureEntry <- xmlGetWidget xml castToEntry "signatureEntry"
> passwordEntry <- xmlGetWidget xml castToEntry "passwordEntry"
> repeatEntry <- xmlGetWidget xml castToEntry "repeatEntry"
> return UserPanel {userPanelSignatureEntry = signatureEntry,
> 	     	  userPanelPasswordEntry = passwordEntry,
> 	     	  userPanelRepeatEntry = repeatEntry}

Use one of the general monadic combinators given in Control.Monad:

liftM3 UserPanel (xmlGetWidget xml castToEntry "signatureEntry")
                  (xmlGetWidget xml castToEntry "passwordEntry")
                  (xmlGetWidget xml castToEntry "repeatEntry")

or

return UserPanel
   `ap` xmlGetWidget xml castToEntry "signatureEntry"
   `ap` xmlGetWidget xml castToEntry "passwordEntry"
   `ap` xmlGetWidget xml castToEntry "repeatEntry"

   Tillmann