Run results for: useMemo vs plain length check

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 16_6_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.6 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 16

Operating system: iOS 16.6.1

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
With UseMemo	574586.2 Ops/sec
Without UseMemo	630678.8 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: useMemo vs plain length check

With UseMemo

Without UseMemo