--- /dev/null
+var MapCache = require('./_MapCache'),
+ cachePush = require('./_cachePush');
+
+/**
+ *
+ * Creates a set cache object to store unique values.
+ *
+ * @private
+ * @param {Array} [values] The values to cache.
+ */
+function SetCache(values) {
+ var index = -1,
+ length = values ? values.length : 0;
+
+ this.__data__ = new MapCache;
+ while (++index < length) {
+ this.push(values[index]);
+ }
+}
+
+// Add functions to the `SetCache`.
+SetCache.prototype.push = cachePush;
+
+module.exports = SetCache;