Benchmark: React useCallback hook vs. function (React 18)

HTML Preparation code:

<!doctype html>
<html>
  <head>
    <title>This is the title of the webpage!</title>
  </head>
  <body>
  	<script src="https://cdnjs.cloudflare.com/ajax/libs/react/18.2.0/umd/react.production.min.js"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/18.2.0/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

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

LLMs can make mistakes. Check important info.

Measuring the performance of different approaches in React can be helpful to identify which one is most efficient.

**Overview**

The provided benchmark compares four different approaches for defining functions within a React component: using an outer function with `useCallback`, using a function directly, using an inline function, and using an arrow function.

**Options Compared**

1. **Outer Function with `useCallback`**: This approach defines the test function as a separate function outside of the component's scope, but still uses `useCallback` to memoize it.
2. **Direct Function**: This approach defines the test function directly within the component's scope without any additional optimization.
3. **Inline Function**: This approach defines the test function inline within the component's JSX element.
4. **Arrow Function**: This approach defines the test function using an arrow function syntax.

**Pros and Cons of Each Approach**

1. **Outer Function with `useCallback`**:
	* Pros: Reduces overhead of creating a new function on every render, as `useCallback` memoizes the function once.
	* Cons: May introduce additional complexity due to the need for an outer function.
2. **Direct Function**:
	* Pros: Simple and easy to understand, no additional optimization needed.
	* Cons: Creates a new function on every render, which can lead to performance issues.
3. **Inline Function**:
	* Pros: Reduces code bloat by defining the function inline.
	* Cons: May lead to increased overhead due to the need for parsing and compilation of the inline function.
4. **Arrow Function**:
	* Pros: Compact syntax, easy to read and understand.
	* Cons: May not be as efficient as other approaches due to potential overhead of compiling arrow functions.

**Library**

The benchmark uses React and ReactDOM libraries, which are part of the React ecosystem. These libraries provide a way to build user interfaces and manage state changes in React applications.

**Special JS Features/Syntax**

None mentioned explicitly, but note that arrow functions were introduced in ECMAScript 2015 (ES6) and have since become a standard feature in modern JavaScript.

**Other Alternatives**

For measuring performance differences, other alternatives include:

1. **Benchmarking libraries**: Such as Benchmark.js or jsperf.
2. **Browser DevTools**: Can be used to profile and benchmark browser performance.
3. **JavaScript performance testing frameworks**: Such as Jest or Mocha with built-in benchmarking plugins.

Keep in mind that the specific approach and tools used may affect the results and conclusions drawn from the benchmark.

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/105.0.0.0 Safari/537.36

Browser/OS: Chrome 105 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
ComponentWithOuterFunctionUseCallback	240632.7 Ops/sec
ComponentWithUseCallback	250171.5 Ops/sec
ComponentWithInlineFunction	198599.5 Ops/sec
ComponentWithArrowFunction	199261.1 Ops/sec

Related benchmarks:

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

Comparing performance of: ComponentWithOuterFunctionUseCallback vs ComponentWithUseCallback vs ComponentWithInlineFunction vs ComponentWithArrowFunction

Created: 2 years ago by: Registered User

Jump to the latest result

ComponentWithOuterFunctionUseCallback

ComponentWithUseCallback

ComponentWithInlineFunction

ComponentWithArrowFunction

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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