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Especially useful for rate limiting\n * execution of handlers on events like resize and scroll.\n *\n * @param {Number} delay A zero-or-greater delay in milliseconds. For event callbacks, values around 100 or 250 (or even higher) are most useful.\n * @param {Boolean} [noTrailing] Optional, defaults to false. If noTrailing is true, callback will only execute every `delay` milliseconds while the\n * throttled-function is being called. If noTrailing is false or unspecified, callback will be executed one final time\n * after the last throttled-function call. (After the throttled-function has not been called for `delay` milliseconds,\n * the internal counter is reset)\n * @param {Function} callback A function to be executed after delay milliseconds. The `this` context and all arguments are passed through, as-is,\n * to `callback` when the throttled-function is executed.\n * @param {Boolean} [debounceMode] If `debounceMode` is true (at begin), schedule `clear` to execute after `delay` ms. If `debounceMode` is false (at end),\n * schedule `callback` to execute after `delay` ms.\n *\n * @return {Function} A new, throttled, function.\n */\nmodule.exports = function ( delay, noTrailing, callback, debounceMode ) {\n\n\t// After wrapper has stopped being called, this timeout ensures that\n\t// `callback` is executed at the proper times in `throttle` and `end`\n\t// debounce modes.\n\tvar timeoutID;\n\n\t// Keep track of the last time `callback` was executed.\n\tvar lastExec = 0;\n\n\t// `noTrailing` defaults to falsy.\n\tif ( typeof noTrailing !== 'boolean' ) {\n\t\tdebounceMode = callback;\n\t\tcallback = noTrailing;\n\t\tnoTrailing = undefined;\n\t}\n\n\t// The `wrapper` function encapsulates all of the throttling / debouncing\n\t// functionality and when executed will limit the rate at which `callback`\n\t// is executed.\n\tfunction wrapper () {\n\n\t\tvar self = this;\n\t\tvar elapsed = Number(new Date()) - lastExec;\n\t\tvar args = arguments;\n\n\t\t// Execute `callback` and update the `lastExec` timestamp.\n\t\tfunction exec () {\n\t\t\tlastExec = Number(new Date());\n\t\t\tcallback.apply(self, args);\n\t\t}\n\n\t\t// If `debounceMode` is true (at begin) this is used to clear the flag\n\t\t// to allow future `callback` executions.\n\t\tfunction clear () {\n\t\t\ttimeoutID = undefined;\n\t\t}\n\n\t\tif ( debounceMode && !timeoutID ) {\n\t\t\t// Since `wrapper` is being called for the first time and\n\t\t\t// `debounceMode` is true (at begin), execute `callback`.\n\t\t\texec();\n\t\t}\n\n\t\t// Clear any existing timeout.\n\t\tif ( timeoutID ) {\n\t\t\tclearTimeout(timeoutID);\n\t\t}\n\n\t\tif ( debounceMode === undefined && elapsed > delay ) {\n\t\t\t// In throttle mode, if `delay` time has been exceeded, execute\n\t\t\t// `callback`.\n\t\t\texec();\n\n\t\t} else if ( noTrailing !== true ) {\n\t\t\t// In trailing throttle mode, since `delay` time has not been\n\t\t\t// exceeded, schedule `callback` to execute `delay` ms after most\n\t\t\t// recent execution.\n\t\t\t//\n\t\t\t// If `debounceMode` is true (at begin), schedule `clear` to execute\n\t\t\t// after `delay` ms.\n\t\t\t//\n\t\t\t// If `debounceMode` is false (at end), schedule `callback` to\n\t\t\t// execute after `delay` ms.\n\t\t\ttimeoutID = setTimeout(debounceMode ? clear : exec, debounceMode === undefined ? delay - elapsed : delay);\n\t\t}\n\n\t}\n\n\t// Return the wrapper function.\n\treturn wrapper;\n\n};\n"],"mappings":"AAAA;;AAEA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACAA,MAAM,CAACC,OAAO,GAAG,UAAWC,KAAK,EAAEC,UAAU,EAAEC,QAAQ,EAAEC,YAAY,EAAG;EAEvE;EACA;EACA;EACA,IAAIC,SAAS;;EAEb;EACA,IAAIC,QAAQ,GAAG,CAAC;;EAEhB;EACA,IAAK,OAAOJ,UAAU,KAAK,SAAS,EAAG;IACtCE,YAAY,GAAGD,QAAQ;IACvBA,QAAQ,GAAGD,UAAU;IACrBA,UAAU,GAAGK,SAAS;EACvB;;EAEA;EACA;EACA;EACA,SAASC,OAAOA,CAAA,EAAI;IAEnB,IAAIC,IAAI,GAAG,IAAI;IACf,IAAIC,OAAO,GAAGC,MAAM,CAAC,IAAIC,IAAI,CAAC,CAAC,CAAC,GAAGN,QAAQ;IAC3C,IAAIO,IAAI,GAAGC,SAAS;;IAEpB;IACA,SAASC,IAAIA,CAAA,EAAI;MAChBT,QAAQ,GAAGK,MAAM,CAAC,IAAIC,IAAI,CAAC,CAAC,CAAC;MAC7BT,QAAQ,CAACa,KAAK,CAACP,IAAI,EAAEI,IAAI,CAAC;IAC3B;;IAEA;IACA;IACA,SAASI,KAAKA,CAAA,EAAI;MACjBZ,SAAS,GAAGE,SAAS;IACtB;IAEA,IAAKH,YAAY,IAAI,CAACC,SAAS,EAAG;MACjC;MACA;MACAU,IAAI,CAAC,CAAC;IACP;;IAEA;IACA,IAAKV,SAAS,EAAG;MAChBa,YAAY,CAACb,SAAS,CAAC;IACxB;IAEA,IAAKD,YAAY,KAAKG,SAAS,IAAIG,OAAO,GAAGT,KAAK,EAAG;MACpD;MACA;MACAc,IAAI,CAAC,CAAC;IAEP,CAAC,MAAM,IAAKb,UAAU,KAAK,IAAI,EAAG;MACjC;MACA;MACA;MACA;MACA;MACA;MACA;MACA;MACA;MACAG,SAAS,GAAGc,UAAU,CAACf,YAAY,GAAGa,KAAK,GAAGF,IAAI,EAAEX,YAAY,KAAKG,SAAS,GAAGN,KAAK,GAAGS,OAAO,GAAGT,KAAK,CAAC;IAC1G;EAED;;EAEA;EACA,OAAOO,OAAO;AAEf,CAAC"},"metadata":{},"sourceType":"script","externalDependencies":[]}
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