In Str§
See primary documentation in context for routine val
multi val(*)multi val(Slip \maybevals)multi val(List \maybevals)multi val(Pair \ww-thing)multi val(\one-thing)multi val(Str , :)
Given a Str
that may be parsable as a numeric value, it will attempt to construct the appropriate allomorph, returning one of IntStr
, NumStr
, RatStr
or ComplexStr
or a plain Str
if a numeric value cannot be parsed.
say val("42").^name; # OUTPUT: «IntStr»say val("42e0").^name; # OUTPUT: «NumStr»say val("42.0").^name; # OUTPUT: «RatStr»say val("42+0i").^name; # OUTPUT: «ComplexStr»
You can use the plus and minus sign, as well as the Unicode "Minus Sign" as part of the String
say val("−42"); # OUTPUT: «−42»
While characters belonging to the Unicode categories Nl
(number letters) and No
(other numbers) can be used as numeric literals in the language, they will not be converted to a number by val
, by design, and using val
on them will produce a failure. The same will happen with synthetic numerics (such as 7̈ ). See unival if you need to convert such characters to Numeric
.