Avoid duplicating code in removeHit

README.md

@@ -41,6 +41,12 @@ You can find basic usage examples in `examples`. This module also powers a [real
       .recordHit('another_stats_key', timestamp2, increment)
 	  …
 	  .exec();
+
+    // Removing hits
+    //
+    // It's also possible to decrement the hits counter for
+    // some key
+    ts.removeHit('your_stats_key', [timestamp]).exec();
 
 	// Querying statistics
 	//

examples/hitter.js

@@ -22,7 +22,6 @@ setTimeout(function hit() {
 
 // Just decrement the 'key' counter every once in a while
 // with some delay to try again
-
 setTimeout(function removeHit() {
   ts.removeHit(key)
     .exec(function() {

src/timeseries.js

@@ -57,29 +57,17 @@ TimeSeries.prototype.recordHit = function(key, timestamp, increment) {
  *  stats keys you provide
  *
  * "timestamp" defaults to the current time
- * "decrement" defaults to 1
+ * "decrement" defaults to -1
  *
  *  ts.removeHit('your_stats_key')
- *  .removeHit('another_stats_key', timestamp)
- *  .removeHit('another_stats_key', timestamp2, decrement)
- *   …
- *  .exec();
+ *    .removeHit('another_stats_key', timestamp)
+ *    .removeHit('another_stats_key', timestamp2, decrement)
+ *     …
+ *    .exec();
  */
 TimeSeries.prototype.removeHit = function(key, timestamp, decrement) {
-  var self = this;
-
-  Object.keys(this.granularities).forEach(function(gran) {
-    var properties = self.granularities[gran],
-      keyTimestamp = getRoundedTime(properties.ttl, timestamp),
-            tmpKey = [self.keyBase, key, gran, keyTimestamp].join(':'),
-      hitTimestamp = getRoundedTime(properties.duration, timestamp);
-
-    self.pendingMulti.hincrby(tmpKey, hitTimestamp, Math.floor(decrement || -1));
-    self.pendingMulti.expireat(tmpKey, keyTimestamp + 2 * properties.ttl);
-  });
-
-  return this;
-}
+  return this.recordHit(key, timestamp, -(decrement || 1));
+};
 
 /**
  * Execute the current pending redis multi