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Diffstat (limited to 'node_modules/lodash/_shortOut.js')
-rw-r--r-- | node_modules/lodash/_shortOut.js | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/node_modules/lodash/_shortOut.js b/node_modules/lodash/_shortOut.js new file mode 100644 index 0000000..3300a07 --- /dev/null +++ b/node_modules/lodash/_shortOut.js @@ -0,0 +1,37 @@ +/** 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; |