How to specify optional string parameters in a function signature and identify the pattern
How to specify optional string parameters in a function signature and identify the pattern
As a newbie, I've got a rather simple question.
I would like to define a function that accepts one of a few possible strings.
I.e., I wish to do the following.
f[s_"a"|"b"] := do something useful with s
But of course that syntax doesn't work. Note that the function definition is not overloaded.
I achieved this the following way.
f[key2_ /; MemberQ[Map[StringMatchQ[key2, #] &, "Cat", "Bird", "Mouse"], True]] := someAssoc["Key1"][key2]
Is there a better way to express this?
1 Answer
1
You can use Pattern:
Pattern
f[s : "a" | "b"] := s <> ": stuff"
f /@ "a", "b", "c", 2
"a: stuff", "b: stuff", f["c"], f[2]
@CalvinDale, my pleasure. Thank you for the accept.
– kglr
Aug 25 at 22:15
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Great thanks. As I suspected, the language has an affordance.
– CalvinDale
Aug 25 at 22:13