[Newbies] Re: go to the end of a loop

Balázs Kósi rebmekop at gmail.com
Tue Apr 26 13:21:17 UTC 2016

Hi Joseph!

Here is my take on your problem:

categoriesByPayees *:=* Dictionary new.
FileStream readOnlyFileNamed: 'payees-by-categories.txt' do: [ :file |
    " With #readOnlyFileNamed:do: you don't have to worry about closing the
    it ensures that #close is sent to the file, even if you leave the block
through an Exception. "
    [ file atEnd ] whileFalse: [
        | parts |
        parts *:=* (file nextLine findTokens: $| escapedBy: Character tab)
            collect: #withBlanksCondensed.
        " We collect the parts #withBlanksCondensed, so we don't have to
call it repeatedly in the loop.
        You can use unary selectors in place of blocks with one argument.
You may look at the implementation
        of Collection >> #collect: and Symbol >> #value: to find out why.
I'm not sure what you really want is
        #findTokens:escapedBy:, it cuts the string along | characters if
they are not preceded by a tab."
        parts size > 1 ifTrue: [
            " We skip blank lines or categories without at least one payee.
            | category |
            category *:=* parts first.
            parts allButFirstDo: [ :payee |
                    at: payee
                    ifAbsentPut: [ OrderedCollection new ]) add: category
                    " Your implementation only remembers the last category
encountered for a payee.
                    We can collect all the categories. " ] ] ] ]​

Cheers, Balázs
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