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37 lines
941 B
37 lines
941 B
/** Used to detect hot functions by number of calls within a span of milliseconds. */ |
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var HOT_COUNT = 800, |
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HOT_SPAN = 16; |
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/* Built-in method references for those with the same name as other `lodash` methods. */ |
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var nativeNow = Date.now; |
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/** |
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* Creates a function that'll short out and invoke `identity` instead |
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* of `func` when it's called `HOT_COUNT` or more times in `HOT_SPAN` |
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* milliseconds. |
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* |
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* @private |
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* @param {Function} func The function to restrict. |
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* @returns {Function} Returns the new shortable function. |
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*/ |
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function shortOut(func) { |
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var count = 0, |
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lastCalled = 0; |
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return function() { |
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var stamp = nativeNow(), |
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remaining = HOT_SPAN - (stamp - lastCalled); |
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lastCalled = stamp; |
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if (remaining > 0) { |
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if (++count >= HOT_COUNT) { |
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return arguments[0]; |
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} |
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} else { |
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count = 0; |
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} |
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return func.apply(undefined, arguments); |
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}; |
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} |
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module.exports = shortOut;
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