Re: Taking either a sequence or a list

*To*: mathgroup at smc.vnet.net*Subject*: [mg63097] Re: Taking either a sequence or a list*From*: bghiggins at ucdavis.edu*Date*: Wed, 14 Dec 2005 04:35:59 -0500 (EST)*References*: <dnm29m$89q$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Trevor, Use Alternatives in your pattern, and slightly modify the RHS (replace L with {L}) Foo3[L___Integer | { L___Integer}] := StringJoin["* * * ", ToString[Length[{ L}]], " * * * "]; Cheers, Brian Trevor Baca wrote: > I somtimes SetDelay expressions twice, as in > > Foo[L:{___Integer}] := StringJoin["* * * ", ToString[Length[L]], " * > * * "]; > Foo[n___Integer] := Foo[{n}]; > > reason being that I can then equivalently call either > > Foo[{1, 2, 3, 4, 5}] > Foo[1, 2, 3, 4, 5] > > and not have to worry about whether Foo[ ] takes a string or sequence > as argument. (StringJoin[ ] works the same way, which is where I grew > to like the idea.) > > Question: is there a better way to accomplish this type of setting up > both a list-based and sequence-based interface to an expression, other > than twice calling SetDelay explicitly (perhaps by cleverly using > SetAttributes[ ])? > > Trevor.