Redux & Redux Toolkit Course
Redux & Redux Toolkit
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Intermediate

Debugging Questions

Definition

Questions testing your ability to use the Redux DevTools and identify common fatal errors in Redux logic.

Explain Like I'm New

If you don't know how to use the DevTools Extension, you don't really know Redux.

Real World Example

Being asked what the 'Time Travel' feature actually does under the hood.

Common Use Cases

  • •Technical proficiency verification

Interactive Example

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Interview Questions

basic

  • What error will Redux throw if you try to put a Promise into the state tree?

intermediate

  • How does the Time Travel Debugger work in Redux DevTools?

Flash Cards

Question

What error?

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Answer

A 'Non-Serializable Value' error. RTK includes a middleware that strictly blocks functions, Promises, and class instances from entering the store.

Question

How Time Travel works?

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Answer

Because state is immutable and actions are serializable objects, the DevTools literally records an array of every Action dispatched. When you 'scrub' backwards in time, it simply recalculates the state from the beginning up to that specific point in the action array.