angular implementing validator

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1<>Copyimport {AbstractControl, ValidatorFn} from '@angular/forms';
2
3export function blue(): ValidatorFn {  
4    return (control: AbstractControl): { [key: string]: any } | null =>  
5        control.value?.toLowerCase() === 'blue' 
6            ? null : {wrongColor: control.value};
7}
8

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