number static method

PrismValidator number([
  1. String message = 'Enter a valid number'
])

Fails when the value is not a number.

Implementation

static PrismValidator number([String message = 'Enter a valid number']) =>
    (value) {
      final v = value?.trim() ?? '';
      if (v.isEmpty) return null;
      return double.tryParse(v) != null ? null : message;
    };