Advanced TypeScript Programming Projects

Validating the name

The name validation is the simplest piece of validation we are going to write. This validation assumes that we have a minimum of one letter for the first name and two letters for the last name:

export class PersonValidation implements IValidation {  private readonly firstNameValidator : MinLengthValidator = new MinLengthValidator(1);  private readonly lastNameValidator : MinLengthValidator = new MinLengthValidator(2);  public Validate(state: IPersonState, errors: string[]): void {    if (!this.firstNameValidator.IsValid(state.FirstName)) {      errors.push("The first name is a minimum of 1 character");    }    if (!this.lastNameValidator.IsValid(state.FirstName)) {      errors.push("The last name is a minimum of 2 characters");    }  }}