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I like multi-column list views and I like to be able to sort on the various
columns. One problem I ran into was when some objects had a nil value in
one of the columns that would cause an error when they were sorted. I got
around this issue by using a nil tolerant sort block (see bellow). I added
this method to the SortedCollection class side to make it easy to refer to
it. This block seems to handle any kind of object that responds to #<.
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SortedCollection class<<nilTolerantSortBlock
"cdemers - 5/31/2002 This is a nil tolerant sort block, for use with sorted
collections
that may contain nil values."
^[:a :b | (a isNil or: [b isNil])
ifFalse: [a < b]
ifTrue: [a isNil]]
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I notice that the SortedCollection class has a method that returns a case
sensitive sort block. I wonder if a method to return a nil tolerant sort
block would perhaps be a useful addition to the system? I have found this
to be very handy for column sort blocks.
Chris
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