Run results for: Function declaration vs Function expression in React v2

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36

Browser: Chrome 119

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
function expression	507494.2 Ops/sec
function declaration	388080.1 Ops/sec
function expression var	510190.4 Ops/sec

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:

function expression
const Hello = ({toWhat}) => React.createElement('div', null, `Hello ${toWhat}`); ReactDOM.render( React.createElement(Hello, {toWhat: 'World'}, null), document.getElementById('dest') );
function declaration
function Hello ({toWhat}) { return React.createElement('div', null, `Hello ${toWhat}`); } ReactDOM.render( React.createElement(Hello, {toWhat: 'World'}, null), document.getElementById('dest') );
function expression var
const Hello = ({toWhat}) => React.createElement('div', null, `Hello ${toWhat}`); ReactDOM.render( React.createElement(Hello, {toWhat: 'World'}, null), document.getElementById('dest') );

Run results for: Function declaration vs Function expression in React v2

function expression

function declaration

function expression var