Re: [Pharo-project] Issue 3235 in pharo: better bag sum

Updates: Status: FixedWaitingToBePharoed Comment #2 on issue 3235 by stephane.ducasse: better bag sum http://code.google.com/p/pharo/issues/detail?id=3235 This is strange in pharo there is no sum in Bag just in Collection Collection>>sum "This is implemented using a variant of the normal inject:into: pattern. The reason for this is that it is not known whether we're in the normal number line, i.e. whether 0 is a good initial value for the sum. Consider a collection of measurement objects, 0 would be the unitless value and would not be appropriate to add with the unit-ed objects." | sum sample | sample := self anyOne. sum := self inject: sample into: [:accum :each | accum + each]. ^ sum - sample