Use ES6 Set to optimize for large arrays in _.uniq, _.difference, & _.intersection.

dist/lodash.compat.js

@@ -86,7 +86,7 @@
   /** Used to assign default `context` object properties */
   var contextProps = [
     'Array', 'Boolean', 'Date', 'Error', 'Function', 'Math', 'Number', 'Object',
-    'RegExp', 'String', '_', 'clearTimeout', 'document', 'isFinite', 'isNaN',
+    'RegExp', 'Set', 'String', '_', 'clearTimeout', 'document', 'isFinite', 'isNaN',
     'parseInt', 'setTimeout', 'TypeError', 'window', 'WinRTError'
   ];
 
@@ -248,53 +248,7 @@
    * @returns {number} Returns `0` if `value` is found, else `-1`.
    */
   function cacheIndexOf(cache, value) {
-    var type = typeof value;
-    cache = cache.cache;
-
-    if (type == 'boolean' || value == null) {
-      return cache[value] ? 0 : -1;
-    }
-    if (type != 'number' && type != 'string') {
-      type = 'object';
-    }
-    var key = type == 'number' ? value : '_' + value;
-    cache = (cache = cache[type]) && cache[key];
-
-    return type == 'object'
-      ? (cache && baseIndexOf(cache, value) > -1 ? 0 : -1)
-      : (cache ? 0 : -1);
-  }
-
-  /**
-   * Adds a given value to the corresponding cache object.
-   *
-   * @private
-   * @param {*} value The value to add to the cache.
-   */
-  function cachePush(value) {
-    var cache = this.cache,
-        type = typeof value;
-
-    if (type == 'boolean' || value == null) {
-      cache[value] = true;
-    } else {
-      if (type != 'number' && type != 'string') {
-        type = 'object';
-      }
-      var key = type == 'number' ? value : '_' + value,
-          typeCache = cache[type] || (cache[type] = {});
-
-      if (type == 'object') {
-        var array = typeCache[key];
-        if (array) {
-          array.push(value);
-        } else {
-          typeCache[key] = [value];
-        }
-      } else {
-        typeCache[key] = true;
-      }
-    }
+    return cache.has(value) ? 0 : -1;
   }
 
   /**
@@ -388,38 +342,6 @@
     return a.index - b.index;
   }
 
-  /**
-   * Creates a cache object to optimize linear searches of large arrays.
-   *
-   * @private
-   * @param {Array} [array=[]] The array to search.
-   * @returns {null|Object} Returns the cache object or `null` if caching should not be used.
-   */
-  function createCache(array) {
-    var index = -1,
-        length = array.length,
-        first = array[0],
-        mid = array[(length / 2) | 0],
-        last = array[length - 1];
-
-    if (first && typeof first == 'object' &&
-        mid && typeof mid == 'object' && last && typeof last == 'object') {
-      return false;
-    }
-    var cache = getObject();
-    cache['false'] = cache['null'] = cache['true'] = cache['undefined'] = false;
-
-    var result = getObject();
-    result.array = array;
-    result.cache = cache;
-    result.push = cachePush;
-
-    while (++index < length) {
-      result.push(array[index]);
-    }
-    return result;
-  }
-
   /**
    * Used by `escape` to convert characters to HTML entities.
    *
@@ -461,18 +383,8 @@
    */
   function getObject() {
     return objectPool.pop() || {
-      'array': null,
-      'cache': null,
       'criteria': null,
-      'false': false,
       'index': 0,
-      'null': false,
-      'number': null,
-      'object': null,
-      'push': null,
-      'string': null,
-      'true': false,
-      'undefined': false,
       'value': null
     };
   }
@@ -510,11 +422,7 @@
    * @param {Object} object The object to release.
    */
   function releaseObject(object) {
-    var cache = object.cache;
-    if (cache) {
-      releaseObject(cache);
-    }
-    object.array = object.cache = object.criteria = object.object = object.number = object.string = object.value = null;
+    object.criteria = object.value = null;
     if (objectPool.length < MAX_POOL_SIZE) {
       objectPool.push(object);
     }
@@ -696,6 +604,7 @@
         hasOwnProperty = objectProto.hasOwnProperty,
         push = arrayRef.push,
         propertyIsEnumerable = objectProto.propertyIsEnumerable,
+        Set = isNative(Set = context.Set) && Set,
         setTimeout = context.setTimeout,
         splice = arrayRef.splice,
         unshift = arrayRef.unshift;
@@ -720,6 +629,7 @@
         nativeKeys = isNative(nativeKeys = Object.keys) && nativeKeys,
         nativeMax = Math.max,
         nativeMin = Math.min,
+        nativeNow = isNative(nativeNow = Date.now) && nativeNow,
         nativeParseInt = context.parseInt,
         nativeRandom = Math.random,
         nativeTrim = isNative(nativeTrim = stringProto.trim) && !nativeTrim.call(whitespace) && nativeTrim,
@@ -1409,17 +1319,11 @@
       var index = -1,
           indexOf = getIndexOf(),
           length = array ? array.length : 0,
-          isLarge = length >= LARGE_ARRAY_SIZE && indexOf === baseIndexOf,
           result = [];
 
-      if (isLarge) {
-        var cache = createCache(values);
-        if (cache) {
-          indexOf = cacheIndexOf;
-          values = cache;
-        } else {
-          isLarge = false;
-        }
+      if (Set && length >= LARGE_ARRAY_SIZE && indexOf === baseIndexOf) {
+        indexOf = cacheIndexOf;
+        values = createCache(values);
       }
       while (++index < length) {
         var value = array[index];
@@ -1427,9 +1331,6 @@
           result.push(value);
         }
       }
-      if (isLarge) {
-        releaseObject(values);
-      }
       return result;
     }
 
@@ -1775,15 +1676,14 @@
       var index = -1,
           indexOf = getIndexOf(),
           length = array ? array.length : 0,
+          isLarge = Set && !isSorted && length >= LARGE_ARRAY_SIZE && indexOf === baseIndexOf,
           result = [];
 
-      var isLarge = !isSorted && length >= LARGE_ARRAY_SIZE && indexOf === baseIndexOf,
-          seen = (callback || isLarge) ? getArray() : result;
-
       if (isLarge) {
-        var cache = createCache(seen);
+        var seen = createCache();
         indexOf = cacheIndexOf;
-        seen = cache;
+      } else {
+        seen = callback ? getArray() : result;
       }
       while (++index < length) {
         var value = array[index],
@@ -1799,10 +1699,7 @@
           result.push(value);
         }
       }
-      if (isLarge) {
-        releaseArray(seen.array);
-        releaseObject(seen);
-      } else if (callback) {
+      if (!isLarge && callback) {
         releaseArray(seen);
       }
       return result;
@@ -1840,6 +1737,24 @@
       };
     }
 
+    /**
+     * Creates a cache object to optimize linear searches of large arrays.
+     *
+     * @private
+     * @param {Array} [array=[]] The array to search.
+     * @returns {Object} Returns the cache object.
+     */
+    function createCache(array) {
+      var cache = new Set,
+          length = array ? array.length : 0;
+
+      cache.push = cache.add;
+      while (length--) {
+        cache.push(array[length]);
+      }
+      return cache;
+    }
+
     /**
      * Creates a function that, when called, either curries or invokes `func`
      * with an optional `this` binding and partially applied arguments.
@@ -2490,14 +2405,14 @@
           argsLength = arguments.length,
           caches = getArray(),
           indexOf = getIndexOf(),
-          trustIndexOf = indexOf === baseIndexOf,
+          largePrereq = Set && indexOf === baseIndexOf,
           seen = getArray();
 
       while (++argsIndex < argsLength) {
         var value = arguments[argsIndex];
         if (isArray(value) || isArguments(value)) {
           args.push(value);
-          caches.push(trustIndexOf && value.length >= LARGE_ARRAY_SIZE &&
+          caches.push(largePrereq && value.length >= LARGE_ARRAY_SIZE &&
             createCache(argsIndex ? args[argsIndex] : seen));
         }
       }
@@ -2523,12 +2438,6 @@
           result.push(value);
         }
       }
-      while (argsLength--) {
-        cache = caches[argsLength];
-        if (cache) {
-          releaseObject(cache);
-        }
-      }
       releaseArray(caches);
       releaseArray(seen);
       return result;
@@ -7104,7 +7013,7 @@
      * _.defer(function() { console.log(_.now() - stamp); });
      * // => logs the number of milliseconds it took for the deferred function to be called
      */
-    var now = isNative(now = Date.now) && now || function() {
+    var now = nativeNow || function() {
       return new Date().getTime();
     };
 

dist/lodash.compat.min.js

@@ -3,62 +3,60 @@
  * Lo-Dash 2.4.1 (Custom Build) lodash.com/license | Underscore.js 1.5.2 underscorejs.org/LICENSE
  * Build: `lodash -o ./dist/lodash.compat.js`
  */
-;(function(){function n(n,t){if(n!==t){if(n>t||typeof n=="undefined")return 1;if(n<t||typeof t=="undefined")return-1}return 0}function t(n,t,r){r=(r||0)-1;for(var e=n?n.length:0;++r<e;)if(n[r]===t)return r;return-1}function r(n,r){var e=typeof r;return n=n.h,"boolean"==e||null==r?n[r]?0:-1:("number"!=e&&"string"!=e&&(e="object"),n=(n=n[e])&&n["number"==e?r:"_"+r],"object"==e?n&&-1<t(n,r)?0:-1:n?0:-1)}function e(n){var t=this.h,r=typeof n;if("boolean"==r||null==n)t[n]=true;else{"number"!=r&&"string"!=r&&(r="object");
-var e="number"==r?n:"_"+n,t=t[r]||(t[r]={});"object"==r?(r=t[e])?r.push(n):t[e]=[n]:t[e]=true}}function u(n){return n.charCodeAt(0)}function o(n,t){for(var r=-1,e=n.length;++r<e&&0<=t.indexOf(n.charAt(r)););return r}function a(n,t){for(var r=n.length;r--&&0<=t.indexOf(n.charAt(r)););return r}function i(t,r){return n(t.i,r.i)||t.j-r.j}function l(t,r){for(var e=t.i,u=r.i,o=-1,a=e.length;++o<a;){var i=n(e[o],u[o]);if(i)return i}return t.j-r.j}function f(n){var t=-1,r=n.length,u=n[0],o=n[r/2|0],a=n[r-1];
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+!yt||yt.global!==yt&&yt.window!==yt||(ht=yt);var yt=(st=st[typeof module]&&module&&!module.nodeType&&module)&&st.exports===vt&&vt,mt=_();typeof define=="function"&&typeof define.amd=="object"&&define.amd?(ht._=mt, define(function(){return mt})):vt&&st?yt?(st.exports=mt)._=mt:vt._=mt:ht._=mt}).call(this);

dist/lodash.js

@@ -86,7 +86,7 @@
   /** Used to assign default `context` object properties */
   var contextProps = [
     'Array', 'Boolean', 'Date', 'Function', 'Math', 'Number', 'Object',
-    'RegExp', 'String', '_', 'clearTimeout', 'document', 'isFinite', 'isNaN',
+    'RegExp', 'Set', 'String', '_', 'clearTimeout', 'document', 'isFinite', 'isNaN',
     'parseInt', 'setTimeout', 'TypeError', 'window', 'WinRTError'
   ];
 
@@ -241,53 +241,7 @@
    * @returns {number} Returns `0` if `value` is found, else `-1`.
    */
   function cacheIndexOf(cache, value) {
-    var type = typeof value;
-    cache = cache.cache;
-
-    if (type == 'boolean' || value == null) {
-      return cache[value] ? 0 : -1;
-    }
-    if (type != 'number' && type != 'string') {
-      type = 'object';
-    }
-    var key = type == 'number' ? value : '_' + value;
-    cache = (cache = cache[type]) && cache[key];
-
-    return type == 'object'
-      ? (cache && baseIndexOf(cache, value) > -1 ? 0 : -1)
-      : (cache ? 0 : -1);
-  }
-
-  /**
-   * Adds a given value to the corresponding cache object.
-   *
-   * @private
-   * @param {*} value The value to add to the cache.
-   */
-  function cachePush(value) {
-    var cache = this.cache,
-        type = typeof value;
-
-    if (type == 'boolean' || value == null) {
-      cache[value] = true;
-    } else {
-      if (type != 'number' && type != 'string') {
-        type = 'object';
-      }
-      var key = type == 'number' ? value : '_' + value,
-          typeCache = cache[type] || (cache[type] = {});
-
-      if (type == 'object') {
-        var array = typeCache[key];
-        if (array) {
-          array.push(value);
-        } else {
-          typeCache[key] = [value];
-        }
-      } else {
-        typeCache[key] = true;
-      }
-    }
+    return cache.has(value) ? 0 : -1;
   }
 
   /**
@@ -381,38 +335,6 @@
     return a.index - b.index;
   }
 
-  /**
-   * Creates a cache object to optimize linear searches of large arrays.
-   *
-   * @private
-   * @param {Array} [array=[]] The array to search.
-   * @returns {null|Object} Returns the cache object or `null` if caching should not be used.
-   */
-  function createCache(array) {
-    var index = -1,
-        length = array.length,
-        first = array[0],
-        mid = array[(length / 2) | 0],
-        last = array[length - 1];
-
-    if (first && typeof first == 'object' &&
-        mid && typeof mid == 'object' && last && typeof last == 'object') {
-      return false;
-    }
-    var cache = getObject();
-    cache['false'] = cache['null'] = cache['true'] = cache['undefined'] = false;
-
-    var result = getObject();
-    result.array = array;
-    result.cache = cache;
-    result.push = cachePush;
-
-    while (++index < length) {
-      result.push(array[index]);
-    }
-    return result;
-  }
-
   /**
    * Used by `escape` to convert characters to HTML entities.
    *
@@ -454,18 +376,8 @@
    */
   function getObject() {
     return objectPool.pop() || {
-      'array': null,
-      'cache': null,
       'criteria': null,
-      'false': false,
       'index': 0,
-      'null': false,
-      'number': null,
-      'object': null,
-      'push': null,
-      'string': null,
-      'true': false,
-      'undefined': false,
       'value': null
     };
   }
@@ -490,11 +402,7 @@
    * @param {Object} object The object to release.
    */
   function releaseObject(object) {
-    var cache = object.cache;
-    if (cache) {
-      releaseObject(cache);
-    }
-    object.array = object.cache = object.criteria = object.object = object.number = object.string = object.value = null;
+    object.criteria = object.value = null;
     if (objectPool.length < MAX_POOL_SIZE) {
       objectPool.push(object);
     }
@@ -673,6 +581,7 @@
         getPrototypeOf = isNative(getPrototypeOf = Object.getPrototypeOf) && getPrototypeOf,
         hasOwnProperty = objectProto.hasOwnProperty,
         push = arrayRef.push,
+        Set = isNative(Set = context.Set) && Set,
         setTimeout = context.setTimeout,
         splice = arrayRef.splice,
         unshift = arrayRef.unshift;
@@ -697,6 +606,7 @@
         nativeKeys = isNative(nativeKeys = Object.keys) && nativeKeys,
         nativeMax = Math.max,
         nativeMin = Math.min,
+        nativeNow = isNative(nativeNow = Date.now) && nativeNow,
         nativeParseInt = context.parseInt,
         nativeRandom = Math.random,
         nativeTrim = isNative(nativeTrim = stringProto.trim) && !nativeTrim.call(whitespace) && nativeTrim,
@@ -1185,17 +1095,11 @@
       var index = -1,
           indexOf = getIndexOf(),
           length = array ? array.length : 0,
-          isLarge = length >= LARGE_ARRAY_SIZE && indexOf === baseIndexOf,
           result = [];
 
-      if (isLarge) {
-        var cache = createCache(values);
-        if (cache) {
-          indexOf = cacheIndexOf;
-          values = cache;
-        } else {
-          isLarge = false;
-        }
+      if (Set && length >= LARGE_ARRAY_SIZE && indexOf === baseIndexOf) {
+        indexOf = cacheIndexOf;
+        values = createCache(values);
       }
       while (++index < length) {
         var value = array[index];
@@ -1203,9 +1107,6 @@
           result.push(value);
         }
       }
-      if (isLarge) {
-        releaseObject(values);
-      }
       return result;
     }
 
@@ -1517,15 +1418,14 @@
       var index = -1,
           indexOf = getIndexOf(),
           length = array ? array.length : 0,
+          isLarge = Set && !isSorted && length >= LARGE_ARRAY_SIZE && indexOf === baseIndexOf,
           result = [];
 
-      var isLarge = !isSorted && length >= LARGE_ARRAY_SIZE && indexOf === baseIndexOf,
-          seen = (callback || isLarge) ? getArray() : result;
-
       if (isLarge) {
-        var cache = createCache(seen);
+        var seen = createCache();
         indexOf = cacheIndexOf;
-        seen = cache;
+      } else {
+        seen = callback ? getArray() : result;
       }
       while (++index < length) {
         var value = array[index],
@@ -1541,10 +1441,7 @@
           result.push(value);
         }
       }
-      if (isLarge) {
-        releaseArray(seen.array);
-        releaseObject(seen);
-      } else if (callback) {
+      if (!isLarge && callback) {
         releaseArray(seen);
       }
       return result;
@@ -1582,6 +1479,24 @@
       };
     }
 
+    /**
+     * Creates a cache object to optimize linear searches of large arrays.
+     *
+     * @private
+     * @param {Array} [array=[]] The array to search.
+     * @returns {Object} Returns the cache object.
+     */
+    function createCache(array) {
+      var cache = new Set,
+          length = array ? array.length : 0;
+
+      cache.push = cache.add;
+      while (length--) {
+        cache.push(array[length]);
+      }
+      return cache;
+    }
+
     /**
      * Creates a function that, when called, either curries or invokes `func`
      * with an optional `this` binding and partially applied arguments.
@@ -2189,14 +2104,14 @@
           argsLength = arguments.length,
           caches = getArray(),
           indexOf = getIndexOf(),
-          trustIndexOf = indexOf === baseIndexOf,
+          largePrereq = Set && indexOf === baseIndexOf,
           seen = getArray();
 
       while (++argsIndex < argsLength) {
         var value = arguments[argsIndex];
         if (isArray(value) || isArguments(value)) {
           args.push(value);
-          caches.push(trustIndexOf && value.length >= LARGE_ARRAY_SIZE &&
+          caches.push(largePrereq && value.length >= LARGE_ARRAY_SIZE &&
             createCache(argsIndex ? args[argsIndex] : seen));
         }
       }
@@ -2222,12 +2137,6 @@
           result.push(value);
         }
       }
-      while (argsLength--) {
-        cache = caches[argsLength];
-        if (cache) {
-          releaseObject(cache);
-        }
-      }
       releaseArray(caches);
       releaseArray(seen);
       return result;
@@ -6785,7 +6694,7 @@
      * _.defer(function() { console.log(_.now() - stamp); });
      * // => logs the number of milliseconds it took for the deferred function to be called
      */
-    var now = isNative(now = Date.now) && now || function() {
+    var now = nativeNow || function() {
       return new Date().getTime();
     };
 

dist/lodash.min.js

@@ -3,57 +3,56 @@
  * Lo-Dash 2.4.1 (Custom Build) lodash.com/license | Underscore.js 1.5.2 underscorejs.org/LICENSE
  * Build: `lodash modern -o ./dist/lodash.js`
  */
-;(function(){function n(n,t){if(n!==t){if(n>t||typeof n=="undefined")return 1;if(n<t||typeof t=="undefined")return-1}return 0}function t(n,t,r){r=(r||0)-1;for(var e=n?n.length:0;++r<e;)if(n[r]===t)return r;return-1}function r(n,r){var e=typeof r;return n=n.h,"boolean"==e||null==r?n[r]?0:-1:("number"!=e&&"string"!=e&&(e="object"),n=(n=n[e])&&n["number"==e?r:"_"+r],"object"==e?n&&-1<t(n,r)?0:-1:n?0:-1)}function e(n){var t=this.h,r=typeof n;if("boolean"==r||null==n)t[n]=true;else{"number"!=r&&"string"!=r&&(r="object");
-var e="number"==r?n:"_"+n,t=t[r]||(t[r]={});"object"==r?(r=t[e])?r.push(n):t[e]=[n]:t[e]=true}}function u(n){return n.charCodeAt(0)}function o(n,t){for(var r=-1,e=n.length;++r<e&&0<=t.indexOf(n.charAt(r)););return r}function i(n,t){for(var r=n.length;r--&&0<=t.indexOf(n.charAt(r)););return r}function a(t,r){return n(t.i,r.i)||t.j-r.j}function f(t,r){for(var e=t.i,u=r.i,o=-1,i=e.length;++o<i;){var a=n(e[o],u[o]);if(a)return a}return t.j-r.j}function l(n){var t=-1,r=n.length,u=n[0],o=n[r/2|0],i=n[r-1];
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dist/lodash.underscore.js

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       nativeKeys = isNative(nativeKeys = Object.keys) && nativeKeys,
       nativeMax = Math.max,
       nativeMin = Math.min,
+      nativeNow = isNative(nativeNow = Date.now) && nativeNow,
       nativeRandom = Math.random;
 
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    * // => logs the number of milliseconds it took for the deferred function to be called
    */
-  var now = isNative(now = Date.now) && now || function() {
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     return new Date().getTime();
   };
 

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+if(!J(n))return r;for(var t in n)zr.call(n,t)&&r.push(t);return r},rt=h(function(n,r,t){zr.call(n,t)?n[t]++:n[t]=1}),tt=h(function(n,r,t){zr.call(n,t)?n[t].push(r):n[t]=[r]}),et=h(function(n,r,t){n[t]=r}),ut=F,ot=function(n,r){if(!J(n))return n;for(var t in n)if(r(n[t],t,n)===ur)break;return n},it=Gr||function(n){return n&&typeof n=="object"&&typeof n.length=="number"&&$r.call(n)==yr||false};H(/x/)&&(H=function(n){return typeof n=="function"&&"[object Function]"==$r.call(n)});var ft=Kr?function(n){return J(n)?Kr(n):[]
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+},o.wrap=function(n,r){return y(r,cr,[n])},o.zip=function(){for(var n=-1,r=B(ut(arguments,"length")),t=Array(0>r?0:r);++n<r;)t[n]=ut(arguments,n);return t},o.collect=F,o.drop=j,o.each=N,o.extend=C,o.methods=V,o.object=function(n,r){var t=-1,e=n?n.length:0,u={};for(r||!e||it(n[0])||(r=[]);++t<e;){var o=n[t];r?u[o]=r[t]:o&&(u[o[0]]=o[1])}return u},o.select=k,o.tail=j,o.unique=A,o.clone=function(n){return J(n)?it(n)?x(n):C({},n):n},o.contains=E,o.escape=function(n){return null==n?"":(n+"").replace(sr,t)
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lodash.js

@@ -85,7 +85,7 @@
   /** Used to assign default `context` object properties */
   var contextProps = [
     'Array', 'Boolean', 'Date', 'Error', 'Function', 'Math', 'Number', 'Object',
-    'RegExp', 'String', '_', 'clearTimeout', 'document', 'isFinite', 'isNaN',
+    'RegExp', 'Set', 'String', '_', 'clearTimeout', 'document', 'isFinite', 'isNaN',
     'parseInt', 'setTimeout', 'TypeError', 'window', 'WinRTError'
   ];
 
@@ -247,53 +247,7 @@
    * @returns {number} Returns `0` if `value` is found, else `-1`.
    */
   function cacheIndexOf(cache, value) {
-    var type = typeof value;
-    cache = cache.cache;
-
-    if (type == 'boolean' || value == null) {
-      return cache[value] ? 0 : -1;
-    }
-    if (type != 'number' && type != 'string') {
-      type = 'object';
-    }
-    var key = type == 'number' ? value : '_' + value;
-    cache = (cache = cache[type]) && cache[key];
-
-    return type == 'object'
-      ? (cache && baseIndexOf(cache, value) > -1 ? 0 : -1)
-      : (cache ? 0 : -1);
-  }
-
-  /**
-   * Adds a given value to the corresponding cache object.
-   *
-   * @private
-   * @param {*} value The value to add to the cache.
-   */
-  function cachePush(value) {
-    var cache = this.cache,
-        type = typeof value;
-
-    if (type == 'boolean' || value == null) {
-      cache[value] = true;
-    } else {
-      if (type != 'number' && type != 'string') {
-        type = 'object';
-      }
-      var key = type == 'number' ? value : '_' + value,
-          typeCache = cache[type] || (cache[type] = {});
-
-      if (type == 'object') {
-        var array = typeCache[key];
-        if (array) {
-          array.push(value);
-        } else {
-          typeCache[key] = [value];
-        }
-      } else {
-        typeCache[key] = true;
-      }
-    }
+    return cache.has(value) ? 0 : -1;
   }
 
   /**
@@ -387,38 +341,6 @@
     return a.index - b.index;
   }
 
-  /**
-   * Creates a cache object to optimize linear searches of large arrays.
-   *
-   * @private
-   * @param {Array} [array=[]] The array to search.
-   * @returns {null|Object} Returns the cache object or `null` if caching should not be used.
-   */
-  function createCache(array) {
-    var index = -1,
-        length = array.length,
-        first = array[0],
-        mid = array[(length / 2) | 0],
-        last = array[length - 1];
-
-    if (first && typeof first == 'object' &&
-        mid && typeof mid == 'object' && last && typeof last == 'object') {
-      return false;
-    }
-    var cache = getObject();
-    cache['false'] = cache['null'] = cache['true'] = cache['undefined'] = false;
-
-    var result = getObject();
-    result.array = array;
-    result.cache = cache;
-    result.push = cachePush;
-
-    while (++index < length) {
-      result.push(array[index]);
-    }
-    return result;
-  }
-
   /**
    * Used by `escape` to convert characters to HTML entities.
    *
@@ -460,18 +382,8 @@
    */
   function getObject() {
     return objectPool.pop() || {
-      'array': null,
-      'cache': null,
       'criteria': null,
-      'false': false,
       'index': 0,
-      'null': false,
-      'number': null,
-      'object': null,
-      'push': null,
-      'string': null,
-      'true': false,
-      'undefined': false,
       'value': null
     };
   }
@@ -509,11 +421,7 @@
    * @param {Object} object The object to release.
    */
   function releaseObject(object) {
-    var cache = object.cache;
-    if (cache) {
-      releaseObject(cache);
-    }
-    object.array = object.cache = object.criteria = object.object = object.number = object.string = object.value = null;
+    object.criteria = object.value = null;
     if (objectPool.length < MAX_POOL_SIZE) {
       objectPool.push(object);
     }
@@ -695,6 +603,7 @@
         hasOwnProperty = objectProto.hasOwnProperty,
         push = arrayRef.push,
         propertyIsEnumerable = objectProto.propertyIsEnumerable,
+        Set = isNative(Set = context.Set) && Set,
         setTimeout = context.setTimeout,
         splice = arrayRef.splice,
         unshift = arrayRef.unshift;
@@ -719,6 +628,7 @@
         nativeKeys = isNative(nativeKeys = Object.keys) && nativeKeys,
         nativeMax = Math.max,
         nativeMin = Math.min,
+        nativeNow = isNative(nativeNow = Date.now) && nativeNow,
         nativeParseInt = context.parseInt,
         nativeRandom = Math.random,
         nativeTrim = isNative(nativeTrim = stringProto.trim) && !nativeTrim.call(whitespace) && nativeTrim,
@@ -1424,17 +1334,11 @@
       var index = -1,
           indexOf = getIndexOf(),
           length = array ? array.length : 0,
-          isLarge = length >= LARGE_ARRAY_SIZE && indexOf === baseIndexOf,
           result = [];
 
-      if (isLarge) {
-        var cache = createCache(values);
-        if (cache) {
-          indexOf = cacheIndexOf;
-          values = cache;
-        } else {
-          isLarge = false;
-        }
+      if (Set && length >= LARGE_ARRAY_SIZE && indexOf === baseIndexOf) {
+        indexOf = cacheIndexOf;
+        values = createCache(values);
       }
       while (++index < length) {
         var value = array[index];
@@ -1442,13 +1346,9 @@
           result.push(value);
         }
       }
-      if (isLarge) {
-        releaseObject(values);
-      }
       return result;
     }
 
-
     /**
      * Iterates `arguments` objects, arrays, objects, and strings consistently
      * across environments, executing the callback for each element in the
@@ -1791,15 +1691,14 @@
       var index = -1,
           indexOf = getIndexOf(),
           length = array ? array.length : 0,
+          isLarge = Set && !isSorted && length >= LARGE_ARRAY_SIZE && indexOf === baseIndexOf,
           result = [];
 
-      var isLarge = !isSorted && length >= LARGE_ARRAY_SIZE && indexOf === baseIndexOf,
-          seen = (callback || isLarge) ? getArray() : result;
-
       if (isLarge) {
-        var cache = createCache(seen);
+        var seen = createCache();
         indexOf = cacheIndexOf;
-        seen = cache;
+      } else {
+        seen = callback ? getArray() : result;
       }
       while (++index < length) {
         var value = array[index],
@@ -1815,10 +1714,7 @@
           result.push(value);
         }
       }
-      if (isLarge) {
-        releaseArray(seen.array);
-        releaseObject(seen);
-      } else if (callback) {
+      if (!isLarge && callback) {
         releaseArray(seen);
       }
       return result;
@@ -1856,6 +1752,24 @@
       };
     }
 
+    /**
+     * Creates a cache object to optimize linear searches of large arrays.
+     *
+     * @private
+     * @param {Array} [array=[]] The array to search.
+     * @returns {Object} Returns the cache object.
+     */
+    function createCache(array) {
+      var cache = new Set,
+          length = array ? array.length : 0;
+
+      cache.push = cache.add;
+      while (length--) {
+        cache.push(array[length]);
+      }
+      return cache;
+    }
+
     /**
      * Creates a function that, when called, either curries or invokes `func`
      * with an optional `this` binding and partially applied arguments.
@@ -2507,14 +2421,14 @@
           argsLength = arguments.length,
           caches = getArray(),
           indexOf = getIndexOf(),
-          trustIndexOf = indexOf === baseIndexOf,
+          largePrereq = Set && indexOf === baseIndexOf,
           seen = getArray();
 
       while (++argsIndex < argsLength) {
         var value = arguments[argsIndex];
         if (isArray(value) || isArguments(value)) {
           args.push(value);
-          caches.push(trustIndexOf && value.length >= LARGE_ARRAY_SIZE &&
+          caches.push(largePrereq && value.length >= LARGE_ARRAY_SIZE &&
             createCache(argsIndex ? args[argsIndex] : seen));
         }
       }
@@ -2540,12 +2454,6 @@
           result.push(value);
         }
       }
-      while (argsLength--) {
-        cache = caches[argsLength];
-        if (cache) {
-          releaseObject(cache);
-        }
-      }
       releaseArray(caches);
       releaseArray(seen);
       return result;
@@ -7123,7 +7031,7 @@
      * _.defer(function() { console.log(_.now() - stamp); });
      * // => logs the number of milliseconds it took for the deferred function to be called
      */
-    var now = isNative(now = Date.now) && now || function() {
+    var now = nativeNow || function() {
       return new Date().getTime();
     };