The Complete React Developer Course (with Hooks and Redux) - Build It: Adding Total Selector

The video tutorial introduces a new feature for Expensify, focusing on creating an expense list header. The tutorial guides viewers through creating a selector function to sum expenses and writing test cases using Test Driven Development (TDD). It emphasizes the use of JavaScript methods like map and reduce, and demonstrates how to refactor code confidently with a robust test suite.

What should happen if an empty array is passed to the function?

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What is the expected output when passing a single expense to the function?

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How does the function handle multiple expenses?

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How can you ensure that the function works correctly after refactoring?

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