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43 lines
1002 B
43 lines
1002 B
2 years ago
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// It's actually "debounce"
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"use strict";
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var isValue = require("es5-ext/object/is-value")
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, callable = require("es5-ext/object/valid-callable")
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, nextTick = require("next-tick")
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, validTimeout = require("./valid-timeout");
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var apply = Function.prototype.apply;
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module.exports = function (fn/*, timeout*/) {
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var scheduled, run, context, args, delay, timeout = arguments[1], handle;
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callable(fn);
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if (isValue(timeout)) {
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timeout = validTimeout(timeout);
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delay = setTimeout;
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} else {
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delay = nextTick;
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}
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run = function () {
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if (!scheduled) return; // IE8 tends to not clear immediate timeouts properly
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scheduled = false;
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handle = null;
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apply.call(fn, context, args);
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context = null;
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args = null;
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};
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return function () {
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if (scheduled) {
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if (!isValue(handle)) {
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// 'nextTick' based, no room for debounce
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return;
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}
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clearTimeout(handle);
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}
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scheduled = true;
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context = this;
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args = arguments;
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handle = delay(run, timeout);
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};
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};
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