Benchmark: React useCallback hook vs. function 2

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/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> 
  </body>
</html>

Script Preparation code:

const e = (evt) => evt.preventDefault();
function MineComponentWithOuterCallback() {
  const testFunction = React.useCallback(e, []);
  return React.createElement('button', {onClick: testFunction}, 'Test click');
}

function MineComponentWithUseCallback() {
  const testFunction = e;
  return React.createElement('button', {onClick: testFunction}, 'Test click');
}

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'))
MineComponentWithOuterCallback
ReactDOM.render(React.createElement(MineComponentWithOuterCallback), document.getElementById('root'))
MineComponentWithUseCallback
ReactDOM.render(React.createElement(MineComponentWithUseCallback), document.getElementById('root'))

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
ComponentWithOuterFunctionUseCallback
ComponentWithUseCallback
ComponentWithInlineFunction
ComponentWithArrowFunction
MineComponentWithOuterCallback
MineComponentWithUseCallback

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36

Browser/OS: Chrome 134 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
ComponentWithOuterFunctionUseCallback	2235547.0 Ops/sec
ComponentWithUseCallback	2175227.8 Ops/sec
ComponentWithInlineFunction	1535405.5 Ops/sec
ComponentWithArrowFunction	1266679.5 Ops/sec
MineComponentWithOuterCallback	1394505.0 Ops/sec
MineComponentWithUseCallback	2347091.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark and explain what's being tested, compared, and its pros/cons.

**Benchmark Overview**

The benchmark compares four different approaches to create a React component:

1. `MineComponentWithOuterCallback`
2. `MineComponentWithUseCallback`
3. `ComponentWithOuterFunctionUseCallback`
4. `ComponentWithUseCallback`

Each test case renders the same component using a different approach, and the benchmark measures which one is faster.

**Comparison Approaches**

The comparison approaches differ in how the `testFunction` is defined and passed to the React component:

1. **`MineComponentWithOuterCallback`**: The `testFunction` is defined as an arrow function `(evt) => evt.preventDefault();`, but it's not bound to any outer scope. Instead, it's wrapped inside a `React.useCallback` hook with an empty dependency array.
2. **`MineComponentWithUseCallback`**: The `testFunction` is assigned directly to the component using the same arrow function syntax as above.
3. **`ComponentWithOuterFunctionUseCallback`**: The `functionToTest` is defined outside the component and passed to `React.useCallback` with an empty dependency array, just like in `MineComponentWithOuterCallback`.
4. **`ComponentWithUseCallback`**: Similar to `MineComponentWithUseCallback`, but without using a separate variable.

**Pros and Cons of Each Approach**

1. **`MineComponentWithOuterCallback`**:
	* Pros: No dependencies are added, which can help with optimization.
	* Cons: The arrow function is not bound to any outer scope, which might lead to unexpected behavior if the component is used in a different context.
2. **`MineComponentWithUseCallback`**:
	* Pros: The arrow function is still defined using the same syntax as above, but it's assigned directly to the component without creating an extra variable.
	* Cons: No optimization benefits are gained from using `React.useCallback`.
3. **`ComponentWithOuterFunctionUseCallback`**:
	* Pros: The `functionToTest` is defined outside the component and passed to `React.useCallback`, which can help with optimization.
	* Cons: The function is still not bound to any outer scope, which might lead to unexpected behavior if the component is used in a different context.
4. **`ComponentWithUseCallback`**:
	* Pros: Similar to `MineComponentWithUseCallback`, but without creating an extra variable.
	* Cons: No optimization benefits are gained from using `React.useCallback`.

**Conclusion**

The benchmark suggests that using a separate function with `React.useCallback` (e.g., `ComponentWithOuterFunctionUseCallback`) might provide some performance benefits compared to directly assigning the arrow function to the component (e.g., `MineComponentWithUseCallback`). However, the difference is relatively small.

It's worth noting that there are other factors that can affect the performance of React components, such as rendering complexity, dependencies, and optimization techniques like code splitting. This benchmark provides a simple comparison, but more comprehensive testing might reveal additional insights into each approach's strengths and weaknesses.

Related benchmarks:

React useCallback hook vs. function 2 (version: 0)

Comparing performance of: ComponentWithOuterFunctionUseCallback vs ComponentWithUseCallback vs ComponentWithInlineFunction vs ComponentWithArrowFunction vs MineComponentWithOuterCallback vs MineComponentWithUseCallback

Created: one year ago by: Guest

Jump to the latest result

ComponentWithOuterFunctionUseCallback

ComponentWithUseCallback

ComponentWithInlineFunction

ComponentWithArrowFunction

MineComponentWithOuterCallback

MineComponentWithUseCallback

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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