main
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Last change
on this file since d565449 was d565449, checked in by stefan toskovski <stefantoska84@…>, 4 weeks ago |
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Update repo after prototype presentation
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100644
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File size:
861 bytes
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| [d565449] | 1 | /**
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| 2 | * Throttle decorator
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| 3 | * @param {Function} fn
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| 4 | * @param {Number} freq
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| 5 | * @return {Function}
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| 6 | */
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| 7 | function throttle(fn, freq) {
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| 8 | let timestamp = 0;
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| 9 | let threshold = 1000 / freq;
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| 10 | let lastArgs;
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| 11 | let timer;
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| 12 |
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| 13 | const invoke = (args, now = Date.now()) => {
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| 14 | timestamp = now;
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| 15 | lastArgs = null;
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| 16 | if (timer) {
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| 17 | clearTimeout(timer);
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| 18 | timer = null;
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| 19 | }
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| 20 | fn.apply(null, args);
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| 21 | }
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| 22 |
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| 23 | const throttled = (...args) => {
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| 24 | const now = Date.now();
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| 25 | const passed = now - timestamp;
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| 26 | if ( passed >= threshold) {
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| 27 | invoke(args, now);
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| 28 | } else {
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| 29 | lastArgs = args;
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| 30 | if (!timer) {
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| 31 | timer = setTimeout(() => {
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| 32 | timer = null;
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| 33 | invoke(lastArgs)
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| 34 | }, threshold - passed);
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| 35 | }
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| 36 | }
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| 37 | }
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| 38 |
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| 39 | const flush = () => lastArgs && invoke(lastArgs);
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| 40 |
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| 41 | return [throttled, flush];
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| 42 | }
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| 43 |
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| 44 | export default throttle;
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