main
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Last change
on this file since e48199a was d24f17c, checked in by Aleksandar Panovski <apano77@…>, 15 months ago |
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Initial commit
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-
Property mode
set to
100644
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File size:
702 bytes
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| 1 | 'use strict';
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| 2 |
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| 3 | /**
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| 4 | * Throttle decorator
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| 5 | * @param {Function} fn
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| 6 | * @param {Number} freq
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| 7 | * @return {Function}
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| 8 | */
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| 9 | function throttle(fn, freq) {
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| 10 | let timestamp = 0;
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| 11 | const threshold = 1000 / freq;
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| 12 | let timer = null;
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| 13 | return function throttled(force, args) {
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| 14 | const now = Date.now();
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| 15 | if (force || now - timestamp > threshold) {
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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 | timestamp = now;
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| 21 | return fn.apply(null, args);
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| 22 | }
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| 23 | if (!timer) {
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| 24 | timer = setTimeout(() => {
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| 25 | timer = null;
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| 26 | timestamp = Date.now();
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| 27 | return fn.apply(null, args);
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| 28 | }, threshold - (now - timestamp));
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| 29 | }
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| 30 | };
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| 31 | }
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| 32 |
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| 33 | export default throttle;
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