Course Completed 16 August 2019

Getting Started with Redux

Redux fundamentals taught by the library's own author — building the store from scratch before reaching for the real thing.

Provider

egghead.io

Instructor

Dan Abramov

Length

2h 1m

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About the course

Thirty short lessons from Dan Abramov, who wrote Redux. The approach that makes it work is that you implement each piece by hand — createStore, combineReducers, connect — before being shown the library version. By the time the real API appears, there’s nothing mysterious left in it.

What it covers

Core principles

• A single immutable state tree
• Describing every change as a plain action object
• Pure versus impure functions, and why reducers must be pure

Reducers

• Writing and testing a counter reducer
• Avoiding array mutation with concat, slice and the spread operator
• Avoiding object mutation with Object.assign and object spread
• Reducer composition, and extracting combineReducers

The store

• getState, dispatch and subscribe
• Implementing createStore from scratch
• Rebuilding combineReducers from scratch

React bindings

• Splitting presentational and container components
• Passing the store down explicitly, then via context
• Provider and connect from react-redux

Notes

Replace this with what actually stuck — the ideas you still use, and the ones you’d approach differently now.

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