what will the following custom validator return if a user enters the year 1987?

Question

If your const minYear = 1900: and your const maxYear = 2100; what will the following custom validator return if a user enters the year 1987?

yearValidator(control: FormControl) {

     if (control.value.trim().length === 0) {

          return null;

     }

     const year = parseInt(control.value, 10);

     if (year >=minYear && year <= maxYear) {

          return { year: true };

     } 

1. yes

2. false

3. null

4. true

Answer 1

Correct answer is :- true