length method

Validator length({ int min = 0, int max = int64Max, String errMsg(String val, int min, int max)?, })

Checks the length of the value makes sure it's between min and max range

Implementation

Validator length(
    {int min = 0,
    int max = int64Max,
    String Function(String val, int min, int max)? errMsg}) {
  validate((v) {
    if (value == null || !value.toString().length.isBetween(min, max)) {
      String err = max == int64Max
          ? 'Length must be greater than $min'
          : 'Length must be between $min and $max';
      return errMsg != null ? errMsg(value.toString(), min, max) : err;
    }

    return null;
  });

  return this;
}