Exercises in Programming Style–Things

NOTE : read the rest of the series, or check out the source code.

If you enjoy read­ing these exer­cises then please buy Crista’s book to sup­port her work.

exercises-prog-styles-cover

Fol­low­ing on from the last post, we will look at the Things style today.

 

Style 10 – Things

You may also know this style as OOP.

 

Constraints

  • Larger problem is decomposed into things that make sense for the problem domain
  • Each thing is a capsule of data that exposes procedures to the rest of the world
  • Data is never accessed directly, only through these procedures
  • Capsules can re-appropriate procedures defined in other capsules

 

First, we have a thing for storing data from a file:

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Then, we another thing for storing the stop words we’ll dealing with later:

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Next, we have another thing that keeps track of the word frequencies:

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Finally, we have a thing that controls the flow of our application:

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And to tie everything together, we need to construct and run the controller:

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Voila!

 

You can find the source code for this exer­cise here.

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Yan Cui

I’m an AWS Serverless Hero and the author of Production-Ready Serverless. I have run production workload at scale in AWS for nearly 10 years and I have been an architect or principal engineer with a variety of industries ranging from banking, e-commerce, sports streaming to mobile gaming. I currently work as an independent consultant focused on AWS and serverless.

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