Benchmark: React useCallback hook vs. function 18

HTML Preparation code:

<!doctype html>
<html>
  <head>
    <title>This is the title of the webpage!</title>
  </head>
  <body>
  	<script crossorigin src="https://unpkg.com/react@18/umd/react.production.min.js"></script>
	<script crossorigin src="https://unpkg.com/react-dom@18/umd/react-dom.production.min.js"></script>
	<div id="root"></div> 
  </body>
</html>

Script Preparation code:

function ComponentWithOuterFunctionUseCallback() {
  function functionToTest(evt) {
	evt.preventDefault();
  }
  const testFunction = React.useCallback(functionToTest, []);
  return React.createElement('button', {onClick: testFunction}, 'Test click');
}

function ComponentWithUseCallback() {
  const testFunction = React.useCallback(evt => evt.preventDefault(), []);
  return React.createElement('button', {onClick: testFunction}, 'Test click');
}

function ComponentWithInlineFunction() {
  function testFunction(evt) {
    evt.preventDefault();
  }
  return React.createElement('button', {onClick: testFunction}, 'Test click');
}

function ComponentWithArrowFunction() {
  const testFunction = (evt) => {
    evt.preventDefault();
  }
  return React.createElement('button', {onClick: testFunction}, 'Test click');
}

Tests:

ComponentWithOuterFunctionUseCallback
ReactDOM.render(React.createElement(ComponentWithOuterFunctionUseCallback), document.getElementById('root'))
ComponentWithUseCallback
ReactDOM.render(React.createElement(ComponentWithUseCallback), document.getElementById('root'))
ComponentWithInlineFunction
ReactDOM.render(React.createElement(ComponentWithInlineFunction), document.getElementById('root'))
ComponentWithArrowFunction
ReactDOM.render(React.createElement(ComponentWithArrowFunction), document.getElementById('root'))

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
ComponentWithOuterFunctionUseCallback
ComponentWithUseCallback
ComponentWithInlineFunction
ComponentWithArrowFunction

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.0.0 Safari/537.36 OPR/104.0.0.0

Browser/OS: Opera 104 on Windows

View result in a separate tab

Test name	Executions per second
ComponentWithOuterFunctionUseCallback	319781.8 Ops/sec
ComponentWithUseCallback	316872.6 Ops/sec
ComponentWithInlineFunction	263111.0 Ops/sec
ComponentWithArrowFunction	258822.1 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 definition and explain what is being tested.

**Benchmark Definition**

The benchmark is comparing four different approaches to defining a function in React components:

1. `React.useCallback` with an outer function
2. `React.useCallback` without an outer function (empty array as second argument)
3. Inline function definition
4. Arrow function definition

**Script Preparation Code**

The code defines four React component functions, each using one of the above approaches to define a function (`testFunction`) that will be used as the `onClick` event handler for a button element.

* `ComponentWithOuterFunctionUseCallback`: uses `React.useCallback` with an outer function
* `ComponentWithUseCallback`: uses `React.useCallback` without an outer function (empty array as second argument)
* `ComponentWithInlineFunction`: defines the function inline
* `ComponentWithArrowFunction`: defines the function using an arrow syntax

**Html Preparation Code**

The code includes the necessary HTML structure for rendering the React components, including the React library and DOM rendering.

**What is being tested?**

The benchmark is testing the performance difference between these four approaches to defining a function in React components. The test cases are comparing the execution speed of each component using `ReactDOM.render`.

**Options compared:**

1. Using `React.useCallback` with an outer function
2. Using `React.useCallback` without an outer function (empty array as second argument)
3. Defining a function inline
4. Defining a function using an arrow syntax

**Pros and Cons of each approach:**

1. **React.useCallback with an outer function**: This approach can help memoize the function by capturing its dependencies, but it requires creating an extra function (the outer function) which might incur some overhead.
2. **React.useCallback without an outer function (empty array as second argument)**: This approach is simpler and doesn't require creating an extra function, but it also loses the ability to memoize the function based on its dependencies.
3. **Defining a function inline**: This approach is simple and straightforward, but it might incur some performance overhead due to the creation of a new function object at each render cycle.
4. **Defining a function using an arrow syntax**: This approach is concise and easy to read, but it doesn't provide any additional benefits over defining a function inline.

**Other considerations:**

* The benchmark is likely trying to isolate the impact of React's `useCallback` optimization, which memoizes functions based on their dependencies.
* The use of `ReactDOM.render` might introduce some overhead due to the DOM rendering process.

**Alternatives:**

There are other approaches to defining functions in React components, such as:

1. Using a separate utility function library (e.g., Lodash)
2. Defining functions using ES6 classes or methods
3. Using a different functional component approach (e.g., using `useCallback` with a different syntax)

However, these alternatives might not be directly comparable to the approaches tested in this benchmark, and their performance characteristics may vary depending on the specific use case.

Related benchmarks:

React useCallback hook vs. function 18 (version: 0)

Comparing performance of: ComponentWithOuterFunctionUseCallback vs ComponentWithUseCallback vs ComponentWithInlineFunction vs ComponentWithArrowFunction

Created: 2 years ago by: Guest

Jump to the latest result

ComponentWithOuterFunctionUseCallback

ComponentWithUseCallback

ComponentWithInlineFunction

ComponentWithArrowFunction

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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