JS-201-ReactFundamentals
  • Part 0: App Overview
  • Part 1: Intro to React
    • 1.0: Packages Setup
    • 1.1: Project Setup
    • 1.2: React Router Dom
  • Part 2: JavaScript Concepts
    • 2.0: ES6 Overview
    • 2.1: classes
    • 2.2: constructors
    • 2.3: extends
    • 2.4: super
    • 2.5: interpolation
    • 2.6: map
    • 2.7: filter
  • Part 3: Functional Components
    • 3.0: Functional Components Overview
    • 3.1: Calling Functional Components
    • 3.2: Single Element Rule
    • 3.3: Arrow Functions
    • 3.4: Challenge
    • 3.4: Solution
    • 3.5: Challenge 2
    • 3.5: Solution 2
  • Part 4: JSX Challenge
    • 4.1: JSX Overview
    • 4.1: Challenge Answer
    • 4.2: className
  • Part 5: Class Concepts
    • 5.1: State
    • 5.2: setState
    • 5.3: Class Components Challenge
    • 5.4: Class Components Challenge Answer
  • Part 6: Props Starter
    • 6.0: Props Overview
    • 6.1: Props Demo and Challenge 1
    • 6.2: Props Answer 2
    • 6.3: Props Passing Functions and Challenge 2
    • 6.4: Props Answer 2
    • 6.5: External Props and Mapping Components
    • 6.6: PropTypes
  • Part 7: Lifecycle Methods
    • 7.0: Lifecycle Overview
    • 7.1: Lifecycle Methods
    • 7.2: Mounting Methods
    • 7.3: Update Methods
    • 7.4: Unmount Methods
  • Part 8: Apps
    • 1.0 - Small Timer Apps
      • 1.1 - Simple Timer
      • 1.2 - Clock App
      • 1.3 - Stop Watch App
      • 1.4 - Challenge
    • 2.0 - Concept List
      • 2.1 - Concept Data
      • 2.2 - Concept App Component
      • 2.3 - Concept Component
      • 2.4 - Concept List Component
    • 3.0 - NYT
      • 3.1 - NytApp Component
      • 3.2 - Nyt Results
    • 4.0 - The Friend List App
      • 4.1 - Friend List App Component
      • 4.2 - Friend Component
    • 5.0 - Movie Search Application
      • 5.1 - Form Component
      • 5.2 - Form Results Component
      • 5.3 - Styled Components
    • 6.0 - YouTube Api
      • 6.1 - Video Component
      • 6.2 - Video Component
      • 6.3 - Video Component
    • 7.0 - Github Api Application
      • 7.1 - The Users
      • 7.2 - Github API Component
      • 7.3 - Github API Card
      • 7.4 - Github API Card Form
      • 7.5 - Github API Card List
      • 7.6 - Github API Search
      • 7.7 - Github API Challenge
    • 8.0 - Bitcoin Api Application
      • 8.1 - Bitcoin API Setup
      • 8.2 - Bitcoin API Fetch
      • 8.3 - Bitcoin API Line Chart
      • 8.4 - Bitcoin API Fetching Data
      • 8.5 - Bitcoin API Info Box
      • 8.6 - Bitcoin API Completed Code
    • 9.0 - Google Maps Api Challenge
    • 10.0 - Sound Cloud App Challenge
    • 11.0 - VR App Challenge
    • 12.0 - React Native Intro
  • Part 9: Project
  • Part 10: Notes
    • 10.1 - Resources
    • 10.2 - Troubleshooting
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  • Life Cycle Overview
  • Birth Phase of a Component
  • Growth/Update Phase of the Component
  • Death / Unmounting Phase of a Component
  1. Part 7: Lifecycle Methods

7.0: Lifecycle Overview

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Last updated 7 years ago

Life Cycle Overview

Think about the circle of life (cue lion king music) for living creatures, and then imagine your React components as little beings going through the same process. They're brought into the world of your app, they go through some changes, and then they eventually die off. This is how React components work, and the React team has provided a series of methods you can use to tap into this process.

Birth Phase of a Component

The first phase of the React Component life cycle is the birth of a component, or as it's called in React terminology, the mounting of the component. Mounting is where the component starts initializing, and the Component's props and state are defined and configured. The Component and all its children are mounted onto the Native UI Stack (DOM, UIView, etc.).

The mounting phase only occurs once.

Growth/Update Phase of the Component

The next phase of the life cycle is the Growth/Update phase. This is the phase where the majority of all the action happens, the majority of time is spent, and this phase can, and usually does, repeat many times. This is where users are interacting with the app and the component is changing things in response to those actions. Some things that can happen are changing state, new props, handling user interactions and input, and communicating with other components.

Death / Unmounting Phase of a Component

The last phase of the React Component life cycle is the Death/Unmount phase. This phase can occur when the user navigates away, the UI page changes, a component is hidden, etc. This is called unmounting in React terms.

Unmounting occurs only once and readies the Component for Garbage Collection.

Life Cycle Methods