Understand Life Cycles in React

If you have exposure to react you have probably heard of life cycles. To understand react lifecycles, let’s understand how a web application generally behaves. If you want to briefly summarize how a web page runs from beginning to end, here is how it’s like: before rendering rendering listening for changes to state or props finish rendering

If you have exposure to react you have probably heard of life cycles.

To understand react lifecycles, let’s understand how a web application generally behaves.

If you want to briefly summarize how a web page runs from beginning to end, here is how it’s like:

• before rendering
• rendering
• listening for changes to state or props
• finish rendering

Ultimately, when you go to facebook and see a bunch of posts, the web application actually makes an api to retrieve those posts before rendering.

Afterward, the application renders this piece of information(via render function). It listens to any changes or events that affect the state or props. When the state or the props of any components changes, the application gets re-rendered.

In react terms, they are represented in this diagram:

There are several lifecycles that affect how components are being rendered:

• constructor
• componentDidUpdate
• componentDidMount
• render
• getDeriveStateFromProps

javascript react-lifecycle react

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