"Predictable state container for JavaScript apps." - Redux Docs

The Three Principles

• Single Source of Truth
• State is Read Only
• Changes are made with Pure Functions

Data Flow

Store

View

Reducers

Dispatch

Action

Single Source of Truth

Todos Example

State is Read Only

Sate.setTodo()

Mostly by convention

• object spread operator
• Middleware

Actions in Redux

Pure Functions

Changes via pure Reducer Functions