Run results for: React: useMemo vs inline computation

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:137.0) Gecko/20100101 Firefox/137.0

Browser: Firefox 137

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 19 days ago

Test name	Executions per second
With UseMemo	988871.0 Ops/sec
Without UseMemo	1035000.2 Ops/sec

HTML Preparation code:

<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>

Script Preparation code:

function WithUseMemo() {
    const [iata, setIata] = React.useState('test')
    const isValid = React.useMemo(() => {
        return iata.length === 3
    }, [iata])
    const clickMe = () => {};
    return React.createElement('button', {
        disabled: !isValid
    }, 'Click me!');
}

function WithoutUseMemo() {
    const [iata, setIata] = React.useState('test')
    const isValid = iata.length === 3
    const clickMe = () => {};
    return React.createElement('button', {
        disabled: !isValid
    }, 'Click me!');
}

Tests:

With UseMemo
ReactDOM.render(React.createElement(WithUseMemo), document.getElementById('root'))
Without UseMemo
ReactDOM.render(React.createElement(WithoutUseMemo), document.getElementById('root'))

Run results for: React: useMemo vs inline computation

With UseMemo

Without UseMemo