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Usage in polling

function poll(callback, interval, timeout) { let endTime = Date.now() + timeout; let checkCondition = function() { if (callback()) { // Success condition met return; } else if (Date.now() < endTime) { // Try again after interval setTimeout(checkCondition, interval); } else { // Timeout reached console.error('Polling timeout'); } }; checkCondition(); } poll( () => { return fetch('/api/data') .then(res => res.json()) .then(data => data.status === 'complete'); }, 1000, // 1-second interval 5000 // 5-second timeout );
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