/Javascript/AngularJS/Angular implementing Validator

Angular implementing Validator

<>Copyimport {AbstractControl, ValidatorFn} from '@angular/forms';

export function blue(): ValidatorFn {  
    return (control: AbstractControl): { [key: string]: any } | null =>  
        control.value?.toLowerCase() === 'blue' 
            ? null : {wrongColor: control.value};
}

Source: indepth.dev

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