pwValidator function

String? pwValidator(
  1. String? pw, {
  2. bool required = true,
  3. String invalid = "invalid password!",
})

Implementation

String? pwValidator(String? pw,{bool required=true,
  String invalid="invalid password!",}){
  if(pw==null||pw.isEmpty)return required?invalid:null;

  if(pw.length<8)return invalid;
  return null;
}