pkg crypto/cipher, type AEAD interface { NonceSize, Open, Overhead, Seal }
pkg crypto/cipher, type AEAD interface, NonceSize() int
pkg crypto/cipher, type AEAD interface, Open([]uint8, []uint8, []uint8, []uint8) ([]uint8, error)
pkg crypto/cipher, type AEAD interface, Overhead() int
pkg crypto/cipher, type AEAD interface, Seal([]uint8, []uint8, []uint8, []uint8) []uint8
pkg crypto/md5, func Sum([]uint8) [16]uint8

Mostrarei alguns exemplos concretos nos próximos capítulos.

---

Os próximos conceitos a serem considerados são todos sobre o programa que executa sua API real (por exemplo, Uvicorn).

## Programa e Processo { #program-and-process }

Falaremos muito sobre o "**processo**" em execução, então é útil ter clareza sobre o que ele significa e qual é a diferença com a palavra "**programa**".

    assertThat(newArray).isEqualTo(new short[] {(short) 0, (short) 1, (short) 2});
    newArray[1] = (short) 5;
    assertThat((short) list.get(1)).isEqualTo((short) 1);
  }

  // This test stems from a real bug found by andrewk
  public void testAsList_subList_toArray_roundTrip() {
    short[] array = {(short) 0, (short) 1, (short) 2, (short) 3};
    List<Short> list = Shorts.asList(array);

                    }
                    return null;
                }
                if (isDataFromNodeStatus) {
                    /* 'this' has been updated and should now
                     * have a real NetBIOS name
                     */
                    calledName = null;
                    return hostName.name;
                }
            } catch (final UnknownHostException uhe) {

                        + "The --fail-on-severity flag will not take effect.");
            }
        }

        // at this point logging is set up, reply so far accumulated logs, if any and swap logger with real one
        Logger logger =
                new Slf4jLogger(context.loggerFactory.getLogger(getClass().getName()));
        context.logger.drain().forEach(e -> logger.log(e.level(), e.message(), e.error()));

Then the cashier 💁 says "I'm finished with doing the burgers" by putting your number on the counter's display, but you don't jump like crazy immediately when the displayed number changes to your turn number. You know no one will steal your burgers because you have the number of your turn, and they have theirs.

		// no action. Thus, we try an innocent seek to the current position
		// to see if Seek is really supported.
		pos1, err := sr.Seek(0, io.SeekCurrent)
		if pos1 >= 0 && err == nil {
			// Seek seems supported, so perform the real Seek.
			pos2, err := sr.Seek(n-1, io.SeekCurrent)
			if pos2 < 0 || err != nil {
				return err
			}
			seekSkipped = pos2 - pos1
		}
	}

	copySkipped, err := io.CopyN(io.Discard, r, n-seekSkipped)

scot

// search : Charleston Road Registry Inc.
// https://www.iana.org/domains/root/db/search.html
search

// seat : SEAT, S.A. (Sociedad Unipersonal)
// https://www.iana.org/domains/root/db/seat.html
seat

// secure : Amazon Registry Services, Inc.
// https://www.iana.org/domains/root/db/secure.html
secure

// security : XYZ.COM LLC

      // It's a weird formula, but tests prove it works.
      int adjust = size() - 1;
      for (int i = 0; i < axes.size(); i++) {
        adjust *= 31;
        adjust = ~~adjust;
        // in GWT, we have to deal with integer overflow carefully
      }
      int hash = 1;
      for (Set<E> axis : axes) {
        hash = 31 * hash + (size() / axis.size() * axis.hashCode());

        hash = ~~hash;
      }

Otra gran funcionalidad necesaria por las APIs es la validación de datos, asegurarse de que los datos sean válidos, dados ciertos parámetros. Por ejemplo, que algún campo sea un `int`, y no algún string aleatorio. Esto es especialmente útil para los datos entrantes.

Sin un sistema de validación de datos, tendrías que hacer todas las comprobaciones a mano, en código.