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// Render new shopping cart UI
renderNewShoppingCart();
} else {
// Render old shopping cart UI
renderOldShoppingCart();
}
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// A simple feature flag service (in a real app, this would query a backend or SaaS)
const featureFlags = {
'newCheckoutFlow': true,
'showPromotionalBanner': false,
'enableDarkMode': true,
'experimentalSearchAlgorithm': true // Used with an Origin Trial
};
function getFeatureFlag(flagName, userId, region) {
// In a real system, complex logic would go here:
// - Check for specific user IDs
// - Evaluate percentage rollouts (e.g., 10% of users see this)
// - Check region-specific overrides
// - Fallback to default if no specific rule applies
console.log(`Evaluating flag '${flagName}' for user ${userId} in ${region}`);
return featureFlags[flagName];
}
// Example component
function MyFeatureComponent({ userId, userRegion }) {
const showNewCheckout = getFeatureFlag('newCheckoutFlow', userId, userRegion);
const enableExperimentalSearch = getFeatureFlag('experimentalSearchAlgorithm', userId, userRegion);
return (
<div>
{showNewCheckout ? (
<NewCheckoutFlow />
) : (
<OldCheckoutFlow />
)}
{enableExperimentalSearch && window.ExperimentalSearchAPI ? (
<ExperimentalSearchWidget /> // Renders only if flag is on AND browser supports Origin Trial
) : (
<StandardSearchWidget />
)}
{/* Other components */}
</div>
);
}
// Somewhere in your app's entry point
// <MyFeatureComponent userId="user-123" userRegion="EU" />
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// In your application logic
function initializeVideoPlayer(userId, userRegion, networkSpeed) {
const isOriginTrialActive = 'ExperimentalVideoAPI' in window; // Check if browser enabled the trial
const enableFeatureGate = getFeatureFlag('ultraFastVideoPlayback', userId, userRegion, networkSpeed); // Your app's gate
if (isOriginTrialActive && enableFeatureGate) {
console.log('Using experimental video API for user:', userId);
window.ExperimentalVideoAPI.initPlayer();
} else {
console.log('Using standard video API for user:', userId);
StandardVideoPlayer.initPlayer();
}
}
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1. è€éæ§ã®ç®¡çïŒ
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if ('SomeNewAPI' in window)
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