switch case

test.ts

switch (this.formulario.tarjeta.value)
      {
        case '1':
          this.tarjeta = 'AMERICAN EX.';
          break;
        case '2':
          this.tarjeta = 'MASTERCARD';
          break;
        case '3':
          this.tarjeta = 'VISA';
          break;
        default:
          this.tarjeta = '';
          break;
      }