Angular Reactive form Validations

Validating input in reactive forms

Validator functions
Validator functions can be either synchronous or asynchronous.

Sync validators: Synchronous functions that take a control instance and immediately return either a set of validation errors or null. You can pass these in as the second argument when you instantiate a FormControl.

Async validators: Asynchronous functions that take a control instance and return a Promise or Observable that later emits a set of validation errors or null. You can pass these in as the third argument when you instantiate a FormControl.

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