Hi Steve,
I didn't know the difference between a keyfn and a comparator.
Thanks for pointing that out!
Kev
On Jun 22, 3:50 pm, "Stephen C. Gilardi" <squee...@mac.com> wrote:
> On Jun 22, 2009, at 1:23 AM, kkw wrote:
>
> > I had some fortune with the sorted-by function:
>
> > 1:11 user=> (sort-by (fn [e] (second e)) [[1 99] [3 4] [5 6] [7 8]])
> > ([3 4] [5 6] [7 8] [1 99])
>
> You were using the form of sort-by that accepts a "keyfn", not the one
> where you also provide a comparator.
>
> > so I thought I'd have a go with sorted-map-by also:
>
> > 1:13 user=> (doc sorted-map-by)
> > -------------------------
> > clojure.core/sorted-map-by
> > ([comparator & keyvals])
> > keyval => key val
> > Returns a new sorted map with supplied mappings, using the supplied
> > comparator.
>
> > 1:14 user=> (sorted-map-by (fn [c] c) 1 2)
> > {1 2}
>
> No comparisons were necessary, so your comparator function wasn't
> called.
>
> > 1:16 user=> (sorted-map-by (fn [c] c) 1 2 3 4)
> > java.lang.RuntimeException: java.lang.IllegalArgumentException: Wrong
> > number of args passed to: user$eval--85$fn (repl-1:16)
>
> sorted-map-by called your comparator, but comparators take two
> arguments and your function only accepts one.
>
> --Steve
>
> smime.p7s
> 3KViewDownload
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