I can use a string template like this:
st = StringTemplate["a is `a` and b is `b`"]; S t @ <|"a" -> 1, "b" -> 2 |>
"a is 1 and b is 2"
But I would like the parameter.
second Be optional, so if I call.
S t @ <|"a" -> 1 |>
I just put
"a is 1"
Something like this is possible with
<* *>: For the case where
second It must be numeric, I can use
StringTemplate["a is `a`<* If[NumericQ[#b], "and b is " <> ToString[#b], ""]*> "]
but is there a way to know if a template parameter is present or absent, instead of being numeric or not?