Category: Tutorial

Sane Single Page Apps: Easy Data Handling with DTOs

When a software collapses, it’s usually due to it being no longer maintainable because of complexity. Brian Kernighan, the creator of AWK programming language, puts it quite explicitly: “Controlling complexity is the essence of computer programming”.

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Gerrit based Workflow – Complete Developer’s Walkthrough

We have successfully adopted the Gerrit workflow for pre-commit code review in Evojam. We believe that this a foundation of high quality of our solutions. After two years we have worked out a complete approach for the pre-commit review with Gerrit, branching model and application provisioning. Now I have realized the there is no definite […]

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Spot Performance Issues Before They Arise: Effective Performance Monitoring with Gatling and ELK

Performance is a complicated beast. Each step in the problem solving chain of performance issues – identification, diagnosis, rectification and verification, pose unique challenges. This post will deal with themes from the first two steps, and is aimed at teams who are already conducting some form of performance testing1. Even if you do have tests […]

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Simple NLP Search in Your Application – Step-by-Step Guide in Scala

Full text search is easy to use. But the inherent ambiguity of natural languages causes search results to be biased with false positives. To obtain more accurate results, we need to change the approach and provide more domain specific data to the search engine. The most common and easiest to improve search results is to […]

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Practical Intro to Monads in JavaScript: Validation

Few weeks ago I published a practical Intro to Monads in JavaScript where I covered basics of Identity and Maybe monads. Some time later I added a tutorial on Either monad and fails-fast error handling. This time I will show you error accumulation in a simple Validation use case.

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Practical Intro to Monads in JavaScript: Either

My simple and practical Intro to Monads in JS, where I covered basics of Identity and Maybe monads, seemed to be helpful for a lot of folks, so I’ve decide to continue the topic. Now it’s time for Either – a tool for fast-failing, synchronous computation chains. A tool that may increase readability and quality of code while reducing error proneness. The best part is that we can still ignore the category theory!

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Practical Intro to Monads in JavaScript

If you’ve heard about Monads but never had time learn them, here’s a simple explanation. Not a theoretical nonsense. It’s a simple, practical tutorial for JavaScript developers showing how some monads can be used. It’s for engineers, not scientists.

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