Course · Section 17: Modern JavaScript Development: Modules, Tooling, and Functional · Lecture 294: Declarative and Functional JavaScript Principles
Implement `todoRemoveReducer(state, action)` where a `remove` action carries an `index`, removing that todo immutably.
+ 1 hidden test run on Submit.
filter builds a new array without the todo at the given index, leaving the original untouched.
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