Indoor positioning with beacons and mobile devices

Imagine you arrive at an airport for the first time and you are in a hurry to find the gate; or you’re in a museum and are interested in a specific section; or you’re about to meet someone in a big hall but have no idea how to give indications to each other about where to meet: Indoor positioning to the rescue.

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Validating Models With Ruby

Most ORMs out there include model validations as part of the features they provide. I think that’s kind of cool and very useful, but sometimes it’s better to abstract that responsibility away from the model, especially in cases where validations are tightly tied to other factors or flows.

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Tired of conditionals? State pattern could help

When writing code, our classes often go through a series of transformations. What starts out as a simple class will grow as behavior is added. And if you didn’t take the necessary precautions, your code will become difficult to understand and maintain. Too often, the state of an object is kept by creating multiple boolean attributes and deciding how to behave based on the values. This can become cumbersome and difficult to maintain when the complexity of your class starts to increase.

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