Merge pull request #8 from DaMouse404/trim-to-length

Implement trimTo function

README.md

@@ -138,10 +138,16 @@ addEpisode(n)
 ```
 Add an episode in position `n`, plucked randomly from the Pool, also ups the count for the programme. Returns the episode added.
 
+```javascript
+trimTo(n)
+```
+
+Removes all but the first `n` child episodes.
+
 ```javascript
 removeAllItems()
 ```
-Removes all child episodes and sets the count of episodes to 0.
+Removes all child episodes and sets the count of episodes to 0 (alias for `trimTo(0)`).
 
 ### Group
 

lib/Fixture.js

@@ -26,7 +26,12 @@ function Fixture(name, data, elementPool, config, fixtureName) {
 /* Instance Methods */
 
 Fixture.prototype.removeAllItems = function() {
-    this.elementsArray.splice(0,this.elementsArray.length);
+    this.trimTo(0);
+};
+
+Fixture.prototype.trimTo = function(length) {
+    var total = this.elementsArray.length;
+    this.elementsArray.splice(length, total-length);
 };
 
 Fixture.prototype.getElement = function (num) {