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React Const vs Function - fixed
(version: 0)
Comparing performance of:
const vs function
Created:
3 years ago
by:
Guest
Go to the latest result
HTML Preparation code:
<script crossorigin src="https://unpkg.com/react@16/umd/react.production.min.js"></script> <script crossorigin src="https://unpkg.com/react-dom@16/umd/react-dom.production.min.js"></script> <div id="dest"></div>
Tests:
const
const Hello = ({toWhat}) => React.createElement('div', null, `Hello ${toWhat}`); ReactDOM.render( React.createElement(Hello, {toWhat: 'World'}, null), document.getElementById('dest') );
function
function Hello({toWhat}){ return React.createElement('div', null, `Hello ${toWhat}`); } ReactDOM.render( React.createElement(Hello, {toWhat: 'Worldd'}, null), document.getElementById('dest') );
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
const
function
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36 Edg/131.0.0.0
Browser/OS:
Chrome 131 on Windows
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<iframe src="https://measurethat.net/Embed?id=580194" width="100%" height="500px"></iframe>
const
175K/s
function
139K/s
View exact numbers
Test name
Executions per second
✓
const
175,115 Ops/sec
function
138,782 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested, compared, and the pros and cons of each approach. **Benchmark Overview** The benchmark is comparing the performance of two ways to define a React component: using `const` and using `function`. Both approaches create a simple "Hello World" component that renders a greeting message with a dynamic parameter. **Script Preparation Code** The script preparation code includes the necessary scripts from the React library, specifically: * `react.production.min.js`: This is the production version of the React JavaScript file. * `react-dom.production.min.js`: This is the production version of the React DOM JavaScript file. These scripts are used to create a basic React application with a single component that renders a greeting message. **Benchmark Preparation Code** The benchmark preparation code includes the HTML code for rendering the React component: ```html <div id="dest"></div> ``` This HTML element will be used as the container for the React component being tested. **Individual Test Cases** There are two test cases: 1. **"const"`**: This test case uses a `const` keyword to define the `Hello` component function. 2. **"function"`**: This test case uses a regular `function` keyword to define the `Hello` component function. Both test cases use the same HTML container and render the same greeting message, but they differ in how the component is defined. **Library: React** React is a JavaScript library for building user interfaces. It provides a way to create reusable UI components using JSX (JavaScript XML). In this benchmark, React is used to create a simple "Hello World" component that renders a greeting message with a dynamic parameter. The `const` and `function` approaches are compared in terms of performance. **Special JS Feature/ Syntax** There is no special JavaScript feature or syntax being tested in this benchmark. However, it's worth noting that both test cases use the same basic React API (JSX) to define the component functions. **Other Alternatives** For building React components, developers can choose between: * **Class Components**: This approach uses a `class` keyword to define the component function. * **Hooks**: This approach uses special JavaScript hooks (`useState`, `useEffect`, etc.) to manage state and side effects in functional components. * **Pure Functions**: This approach uses pure functions (functions that always return the same output given the same input) to render components. In terms of performance, React's class-based component architecture is generally slower than its functional component architecture. However, this benchmark only compares `const` and `function` approaches, which are both part of the functional component architecture. Overall, this benchmark provides a simple and controlled way to compare the performance of two different ways to define React components: using `const` and using `function`.
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