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