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'use strict';
/**
* Throttle decorator
* @param {Function} fn
* @param {Number} freq
* @return {Function}
*/
function throttle(fn, freq) {
let timestamp = 0;
const threshold = 1000 / freq;
let timer = null;
return function throttled(force, args) {
const now = Date.now();
if (force || now - timestamp > threshold) {
if (timer) {
clearTimeout(timer);
timer = null;
}
timestamp = now;
return fn.apply(null, args);
}
if (!timer) {
timer = setTimeout(() => {
timer = null;
timestamp = Date.now();
return fn.apply(null, args);
}, threshold - (now - timestamp));
}
};
}
export default throttle;