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New React Context API

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I like new react API for creating and using context. It feels right. One thing I immediately tried to do was creating a helper which simplifies consuming multiple contexts. Because they create context hell. When you component uses more than one context and because of a children as a function pattern (which is basically the same as render props pattern where component’s children function is...

The best way of rendering a collection of items in React/Redux

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In short The best way to render a collection in React, backed by Redux or other similar library: store a collection as an object where key is item id and value is item itself. That way when rendering collection, pass only item’s id to the item component. Than in item’s connected component query a collection by item’s id you passed early. So something like this. //Item.js import...

Callback refs as componentDidMount in stateless functions in React

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You might think that when developing user interfaces with React and if you want to e.g. apply jQuery method to an element, you must abandon your beloved stateless function in favor of class-based component, directly or indirectly via higher-order components, because stateless function doesn’t have componentDidMount life-cycle hook. You are wrong, you can use callback refs for that where you...

Reactive React component using MobX (counter example)

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In the following (muted) video for beginners I show how simple it is to make a React component reactive using MobX. Component displays counter’s value and buttons for incrementing and decrementing it and when user clicks the buttons, value is updated on screen accordingly. The main takeaway from this example is this: when observable variables are changed, observer components are...

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Hi, I'm Jernej, a software engineer from Slovenia. Welcome to my personal blog. For more about me, my work and hobbies, please visit my profile page.

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