Benchmark: With or without useMemo

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.13.1/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.13.1/umd/react-dom.production.min.js"></script>
<div id="root"></div>

Script Preparation code:

function ComponentWithInlineFunction() {
    const clickMe = () => {};
    return React.createElement('button', {
        onClick: clickMe
    }, 'Click me!');
}

function ComponentWithUseCallback() {
    const clickMe = React.useCallback(() => {}, []);
    return React.createElement('button', {
        onClick: clickMe
    }, 'Click me!');
}

Tests:

Without useMemo
ReactDOM.render(React.createElement(ComponentWithInlineFunction), document.getElementById('root'))
With useMemo
ReactDOM.render(React.createElement(ComponentWithUseCallback), document.getElementById('root'))

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Without useMemo
With useMemo

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36

Browser/OS: Chrome 121 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Without useMemo	792194.3 Ops/sec
With useMemo	927375.6 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark JSON and analyze what is being tested.

**Benchmark Definition**

The benchmark definition consists of two script preparation codes for React components, which are:

1. `ComponentWithInlineFunction`: This component uses an inline function for the `onClick` event handler.
2. `ComponentWithUseCallback`: This component uses the `React.useCallback` hook to memoize the `onClick` event handler.

The benchmark also defines two HTML preparation codes, which include React and ReactDOM scripts.

**Options being compared**

The benchmark is comparing two options:

1. **Without useMemo**: Using inline functions for event handlers.
2. **With useMemo**: Using the `React.useCallback` hook to memoize event handlers.

**Pros and Cons of each approach**

**Without useMemo (inline functions)**

Pros:

* Simpler code, easier to understand and maintain.
* No additional dependencies or configurations required.

Cons:

* May lead to unnecessary re-renders and performance issues if the event handler is not optimized properly.
* Can result in memory leaks if the event handler is not properly cleaned up.

**With useMemo (React.useCallback)**

Pros:

* Optimizes event handlers by memoizing them, reducing unnecessary re-renders.
* Ensures proper cleanup of event handlers when they are no longer needed.
* Improves performance and reduces memory usage.

Cons:

* Adds an extra dependency to the component (in this case, the `[]` array passed to `React.useCallback`), which can lead to unexpected behavior if not handled properly.
* Requires additional knowledge of React hooks and their nuances.

**Library: React**

The provided benchmark uses React as a library. React is a JavaScript library for building user interfaces, and it provides a set of features and components that make it easy to build reusable UI components. In this case, the benchmark is testing how React handles event handlers using inline functions versus memoized event handlers with `React.useCallback`.

**Special JS feature or syntax: None**

There are no special JavaScript features or syntax used in this benchmark.

**Other alternatives**

Alternatives to comparing these two approaches could include:

* Using a different library, such as Angular or Vue.js.
* Comparing the performance of different virtual DOM libraries, such as Facebook's React or Google's Fiber.
* Testing the performance of different rendering strategies, such as server-side rendering or static site generation.

However, the specific comparison between inline functions and memoized event handlers using `React.useCallback` is a common optimization pattern in React development, making it a valuable benchmarking opportunity.

Related benchmarks:

With or without useMemo (version: 0)

Comparing performance of: Without useMemo vs With useMemo

Created: 2 years ago by: Guest

Jump to the latest result

Without useMemo

With useMemo

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):