Edit File: throttle.js
/** * Throttle decorator * @param {Function} fn * @param {Number} freq * @return {Function} */ function throttle(fn, freq) { let timestamp = 0; let threshold = 1000 / freq; let lastArgs; let timer; const invoke = (args, now = Date.now()) => { timestamp = now; lastArgs = null; if (timer) { clearTimeout(timer); timer = null; } fn.apply(null, args); } const throttled = (...args) => { const now = Date.now(); const passed = now - timestamp; if ( passed >= threshold) { invoke(args, now); } else { lastArgs = args; if (!timer) { timer = setTimeout(() => { timer = null; invoke(lastArgs) }, threshold - passed); } } } const flush = () => lastArgs && invoke(lastArgs); return [throttled, flush]; } export default throttle;
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