Anil Singh | Code-sample.com

What are the Validator functions? There are two types of validator functions which are the following - 1.         Async validators 2.         Sync validators Async  validator functions that take a control instance and return an  observable  that later emits a set of validation errors or null. Sync  validator functions that take a control instance and return a set of validation errors or null. Angular runs only  Async validators  due to some performance issues. For more detail kindly refer the link https://www.code-sample.com/2018/05/angular-6-7-documentation-and-examples.html