Enhance comparators for memory connector

lib/connectors/memory.js

@@ -377,24 +377,61 @@ function applyFilter(filter) {
       }
 
       if (example.inq) {
-        if (!value) return false;
-        for (var i = 0; i < example.inq.length; i += 1) {
-          if (example.inq[i] == value) return true;
+        // if (!value) return false;
+        for (var i = 0; i < example.inq.length; i++) {
+          if (example.inq[i] == value) {
+            return true;
+          }
         }
         return false;
       }
 
-      if (isNum(example.gt) && example.gt < value) return true;
-      if (isNum(example.gte) && example.gte <= value) return true;
-      if (isNum(example.lt) && example.lt > value) return true;
-      if (isNum(example.lte) && example.lte >= value) return true;
+      if (testInEquality(example, value)) {
+        return true;
+      }
     }
     // not strict equality
     return (example !== null ? example.toString() : example) == (value !== null ? value.toString() : value);
   }
 
-  function isNum(n) {
-    return typeof n === 'number';
+  /**
+   * Compare two values
+   * @param {*} val1 The 1st value
+   * @param {*} val2 The 2nd value
+   * @returns {number} 0: =, postive: >, negative <
+   * @private
+   */
+  function compare(val1, val2) {
+    if (typeof val1 === 'number') {
+      return val1 - val2;
+    }
+    if (typeof val1 === 'string') {
+      return (val1 > val2) ? 1 : ((val1 < val2) ? -1 : 0);
+    }
+    if (typeof val1 === 'boolean') {
+      return val1 - val2;
+    }
+    if (val1 instanceof Date) {
+      return val1.getTime() - ((val2 && val2.getTime()) || 0);
+    }
+    // Return NaN if we don't know how to compare
+    return (val1 === val2) ? 0 : NaN;
+  }
+
+  function testInEquality(example, val) {
+    if ('gt' in example) {
+      return compare(example.gt, val) > 0;
+    }
+    if ('gte' in example) {
+      return compare(example.gte, val) >= 0;
+    }
+    if ('lt' in example) {
+      return compare(example.lt, val) < 0;
+    }
+    if ('lte' in example) {
+      return compare(example.lte, val) <= 0;
+    }
+    return false;
   }
 }