"montgomery f. tidwell" wrote:

>    totalReceivedFrom: source
>       (incomes includeskey: source)
>          ifTrue: [^incomes at: source]
>          ifFalse: [^0]
> 
>    totalSpentFor: reason
>       (expenditures includeskey: reason)
>          ifTrue: [^expenditures at: reason]
>          ifFalse: [^0]


Usually we'd write something like:

totalReceivedFrom: source
      ^incomes at: source ifAbsent: [ 0 ]

totalSpentFor: reason
	^expenditures at: reason ifAbsent: [ 0 ]

where if you look at the definition for at:ifAbsent: it
would look like your code.

-- 
Ned Konz
currently: Stanwood, WA
email:     ned at bike-nomad.com
homepage:  http://bike-nomad.com