toNum function

IValidator toNum(
  1. IValidator child
)

Coerces a value to a number (num).

Handles existing numbers (num) and strings that can be parsed as a number. Passes the resulting number to the child validator.

Implementation

IValidator toNum(IValidator child) =>
    ($isNumber | $isNumString) &
    transform((value) {
      return switch (value) {
        final num n => n,
        final String s => num.tryParse(s.trim()),
        _ => null,
      };
    }, child);