Welldone Software

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Vitali Zaidman

An Overview of JavaScript Testing in 2020

This guide is intended to catch you up with the most important reasoning, terms, tools, and approaches to JavaScript testing.

28 min readJan 27, 2022

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An Overview of JavaScript Testing in 2020

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Vitali Zaidman

Jest — How To Mock a Function Call Inside a Module

3 min readMay 3, 2021

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Jest — How To Mock a Function Call Inside a Module

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9

Vitali Zaidman

useCallback Might Be What You Meant By useRef & useEffect

Sometimes we respond to React element mounts. The first instinct is to useRef & useEffect. But what you need is often useCallback.

3 min readJan 14, 2021

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useCallback Might Be What You Meant By useRef & useEffect

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Vitali Zaidman

Two Ways to Run Tests on Different Versions of The Same Library F.E. React 17 + React 16

How can you run tests on version X and version Y of a library, with real-world examples of testing React 16 and React 17

4 min readNov 24, 2020

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Two Ways to Run Tests on Different Versions of The Same Library F.E. React 17 + React 16

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Vitali Zaidman

React — When Should Pure Components Be Used?

React.memo / React.PureComponent usage guide

4 min readOct 21, 2020

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React profiler screenshot where Main re-renders often

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Jenia Nemzer

Unit testing Styled Components

Unit testing React components isn’t always easy. In this short article i’ll show some tricks to make our lives a little easier, using…

2 min readJun 8, 2020

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Unit testing Styled Components

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Vitali Zaidman

React- useCallback Invalidates Too Often in Practice

What is issue #14099 in React’s repo and how it affects you?

3 min readMay 25, 2020

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React- useCallback Invalidates Too Often in Practice

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Vitali Zaidman

Forced to Work From Home? Maybe it’s a Blessing in Disguise?

When working remotely, you benefit much more from good working processes and proactive team members and you are punished much more…

6 min readMar 18, 2020

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Forced to Work From Home? Maybe it’s a Blessing in Disguise?

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Vitali Zaidman

Why Did You Render v4 Released!

TypeScript support, Custom hooks tracking (like React-Redux’s useSelector), Tracking of all pure components.

2 min readJan 27, 2020

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Why Did You Render v4 Released!

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Nir Avraham

How to Reduce Unnecessary Re-renders

How placing useState / useSelector in the right component can optimize performance?

3 min readNov 11, 2019

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How to Reduce Unnecessary Re-renders

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The leading full-stack software solutions company. Creating amazing frontends and rock-solid backends using top-notch technologies and practices. Visit us at https://welldone.software/
Connect with Welldone Software
Editors
Vitali Zaidman
https://twitter.com/vzaidman ⎝(•ω•)⎠ https://vzaidman.com
Dani Kenan
Owner and hands-on CTO of Welldone Software — the leading full-stack consultancy in Israel. Getting stuff done, well done.
Michael Rovinsky

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