<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>
function ComponentWithInlineFunction() {
const clickMe = evt => evt.preventDefault();
return React.createElement('button', {onClick: clickMe}, 'Click me!');
}
function ComponentWithUseCallback() {
const clickMe = React.useCallback(evt => evt.preventDefault(), []);
return React.createElement('button', {onClick: clickMe}, 'Click me!');
}
ReactDOM.render(React.createElement(ComponentWithInlineFunction), document.getElementById('root'))
ReactDOM.render(React.createElement(ComponentWithUseCallback), document.getElementById('root'))
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
Inline | |
Hooks |
Test name | Executions per second |
---|---|
Inline | 497981.4 Ops/sec |
Hooks | 624482.3 Ops/sec |
Let's break down the provided JSON data and explain what's being tested.
Benchmark Definition
The benchmark is designed to compare the performance of two approaches in React, a popular JavaScript library for building user interfaces:
clickMe
function is defined directly inside the ComponentWithInlineFunction
function.Script Preparation Code
The script preparation code defines two functions: ComponentWithInlineFunction
and ComponentWithUseCallback
. Both functions create a React button component with an "onClick" event handler. The difference lies in how the event handler is defined:
ComponentWithInlineFunction
: The event handler is defined inline as a function passed to the onClick
property of the button element.ComponentWithUseCallback
: The event handler is defined using React Hooks' useCallback
hook, which memoizes the function so it's only recreated when the dependencies change.Html Preparation Code
The HTML preparation code sets up the environment for rendering the React components. It includes the necessary script tags to load React and its DOM library, as well as a <div>
element with an ID of "root" where the component will be rendered.
Individual Test Cases
There are two test cases:
ComponentWithInlineFunction
component using ReactDOM.render
.ComponentWithUseCallback
component using ReactDOM.render
.Library and Purpose
In this benchmark, React is used as a library for building user interfaces. The useCallback
hook is part of React Hooks, which provides a way to manage side effects and optimize performance in functional components.
Special JS Feature or Syntax
The test case uses the useCallback
hook from React Hooks, which is a special feature of React that allows for memoized functions. This syntax was introduced in ECMAScript 2018 (ES8) and has been widely adopted since then.
Pros and Cons of Different Approaches
Here are some pros and cons of each approach:
Other Considerations
When choosing between these approaches, consider the following factors:
useCallback
may be a better choice.Alternatives
Other alternatives for building user interfaces include:
Keep in mind that the choice of library, framework, or approach depends on the specific project requirements, team experience, and personal preference.