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Popular pages
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About | Sergi Mansilla
I am currently the Director of Platform at Glovo. Before that, I worked on the core of Firefox OS along with Mozilla, and I designed Node.js systems for Telenor Digital. I also do public speaking abou
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Virtual list in vanilla JavaScript | Sergi Mansilla
Let’s say you need to show a scrolling list with millions of rows, or even a reasonably big list with visually complex rows, each one composed by several DOM elements or CSS3 effects. If you try to re
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React patterns: Privileged Content | Sergi Mansilla
In the last project I worked on, some parts in the page should only be shown to privileged users. As easy as it would be to just add that bit of logic in a render method, it would not be idiomatic Rea
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Real World Observables | Sergi Mansilla
Reactive code examples can be mind-blowing. Powerful, succint, robust…they seem to handle many concurrency scenarios without breaking a sweat. But let’s be honest, examples from 30-minute conference t
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Add code coverage to your Node.js projects | Sergi Mansilla
Note: This blog post is inspired on Xavier Seignard’s blog post. He gives a longer introduction on it, and integrates it together with Sonar. You should check it out. Code coverage is convenient to ge
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Writing a JavaScript interpreter for DBN using PEG.js and canvas (Part I) | Sergi Mansilla
In this first part of the article, I will define a grammar for DBN (Design By Numbers) and generate a parser for it that outputs an AST (Abstract Syntax Tree), so I can interpret the syntax tree it la