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DevByJESUS
DevByJESUS

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Demeter Law

Just Look at The Example Below The difference between the two if Condition

Do Not Do This

 private final List<Carriage> carriages [...] private int percentReservedBarrier = 70; public void reserveSeats(ReservationRequest request) { for (Carriage carriage : carriages) { if (carriage.getSeats().getPercentReserved() < percentReservedBarrier) { request.reserveSeatsIn(carriage); return; } } request.cannotFindSeats(); }
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Do This Instead

public void reserveSeats(ReservationRequest request) { for (Carriage carriage : carriages) { if (carriage.hasSeatsAvailableWithin(percentReservedBarrier)) { request.reserveSeatsIn(carriage); return; } } request.cannotFindSeats(); }
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