number static method

String? number(
  1. String? value, {
  2. String errorMsg = 'Enter a valid number',
})

2️⃣ Number validator

Implementation

static String? number(
  String? value, {
  String errorMsg = 'Enter a valid number',
}) {
  if (value == null || value.trim().isEmpty) return 'This field is required';
  return double.tryParse(value) != null ? null : errorMsg;
}