Yeah, I guess I was wondering whether something like it already existed. Thinking about it some more, perhaps what I want is `tr` [1]. E.g.
tr [Foo] [Bar] Incorporating your suggestion would then yield a more general version like: trBy (== Foo) Bar [1] http://en.wikipedia.org/wiki/Tr_(Unix) On Sat, Dec 22, 2012 at 6:46 AM, David Thomas <davidleotho...@gmail.com>wrote: > Seems like the function is easy to define: > > replaceIfEq a b c = if c == a then b else c > > Then the above can be written > > replaceIfEq Foo Bar value > > Or the slightly more general (in exchange for slightly more verbosity at > the call site) > > replaceIf p r a = if p a then r else a > > replaceIf (== Foo) Bar value > > > > > On Fri, Dec 21, 2012 at 6:46 PM, Radical <radi...@google.com> wrote: > >> Sometimes I'll need something like: >> >> if value == Foo then Bar else value >> >> Or some syntactic variation thereof: >> >> case value of { Foo -> Bar; _ -> value } >> >> Is there a better/shorter way to do it? I'm surprised that it's more >> complicated to substitute a value on its own than e.g. in a list, using >> filter. Or perhaps I'm missing the right abstraction? >> >> Thanks, >> >> Alvaro >> >> >> >> >> _______________________________________________ >> Haskell-Cafe mailing list >> Haskell-Cafe@haskell.org >> http://www.haskell.org/mailman/listinfo/haskell-cafe >> >> >
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