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debounceImmediate.js
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debounceImmediate.js
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import curry from './curry';
import _enforceFunction from './internal/_enforceFunction';
import _enforceInterval from './internal/_enforceInterval';
function debounceImmediate(interval, operation) {
_enforceInterval(interval);
_enforceFunction(operation);
let timer = null;
let lastArgs;
let lastCall = 0;
let lastResult;
function cancel() {
clearTimeout(timer);
timer = null;
}
function runner() {
cancel();
lastCall = Date.now();
lastResult = operation(...lastArgs);
return lastResult;
}
function immediatelyDebounced(...args) {
lastArgs = args;
if (timer) {
cancel();
}
if (Date.now() - lastCall >= interval) {
runner();
} else {
timer = setTimeout(runner, interval);
}
return lastResult;
}
immediatelyDebounced.cancel = cancel;
return immediatelyDebounced;
}
/**
* `operation` is called immediately and then `interval` milliseconds after the most
* recent call.
*
* @param {number} interval of milliseconds
* @param {Function} operation
* @return {any} the most recent result of `operation`
*/
export default curry(debounceImmediate);