Obify Consulting

• Architectural pattern that enforces uni-directional data flow.
• Controls derived data and enables communication between multiple components.
• Contains a central Store which has authority for all data.
• Contains a central Store which has authority for all data
• Any update in data must occur here only
• Provides stability to the application.
• Reduces run-time errors.

• DOM manipulation was very expensive.
• Slow and inefficient.
• Memory wastage.
• Because of circular dependencies, complicated model was created around models and views.

• Used to identify unique Virtual DOM Elements with their corresponding data driving data driving the UI.
• Helps React to optimize rendering by recycling existing DOM elements.
• Keys must be a unique number or string.
• Instead of re-rendering, with keys React just re-orders the elements.
• Application’s performance increases.

• Pure components are the simplest, fastest components which we can write.
• Cn replace any component that only has render().
• Enhances the simplicity and performance of the application.

• Code reuse, logic and bootstrap abstraction.
• Render High jacking.
• State abstraction and manipulation.
• Props manipulation.

• Custom components which wraps another component.
• They accept dynamically provided child components.
• Don not modify the input component.
• Do not copy any behavior from the input component.
• Are “Pure” functions.

Controlled Components

• Do not maintain their own state.
• Data is controlled by parent component.
• Takes in current values through props and notifies changes via callbacks.

Uncontrolled Components

• Maintain their own state.
• Data is controlled by DOM.
• Refs are used to get their current value.

• HTML from elements maintain their own state in regular DOMs and update themselves based on user inputs.
• In React, state is contained in the state property of the component and is only updated via setState().
• JavaScript function is used for handling the from submission.