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Learn React Hooks for Frontend Development

Creating Effects

Explore how to manage side effects in React applications using the useEffect hook. Understand when and how effects are created or skipped based on dependency arrays, and learn about component mounting, updating, and unmounting behaviors related to effects.

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Establishing effects

An effect An "effect" in this context refers to the callback function that is specified as the first argument to the useEffect hook. This function contains code that represents a side effect, such as data fetching, subscriptions, or other operations that need to be performed after the component has rendered. can be skipped. As a matter of fact, an effect needs to be created in an update for it to take effect.

This behavior is captured by a dependency array called deps. React uses a utility function called areDepsEqual to help decide whether this array changes. Let's take a closer look at this function: ...