Add introduction for loops

SamyPesse · SamyPesse · commit 31329eda403e · 2014-04-02T19:36:10.000-07:00
diff --git a/SUMMARY.md b/SUMMARY.md
@@ -16,4 +16,7 @@
     * [If](conditional/if.md)
     * [Else](conditional/else.md)
     * [Comparators](conditional/comparators.md)
-    * [Concatenate](conditional/concatenate.md)
+    * [Concatenate](conditional/concatenate.md)
+* [Loops](loops/README.md)
+    * [For](loops/for.md)
+    * [While](loops/while.md)
diff --git a/loops/README.md b/loops/README.md
@@ -0,0 +1,21 @@
+# Loops
+
+Loops are repetitive conditions where one variable in the loop changes. Loops are handy, if you want to run the same code over and over again, each time with a different value.
+
+Instead of writing:
+
+```javascript
+doThing(cars[0]);
+doThing(cars[1]);
+doThing(cars[2]);
+doThing(cars[3]);
+doThing(cars[4]);
+```
+
+You can write:
+
+```javascript
+for (var i=0; i < cars.length; i++) { 
+    doThing(cars[i]);
+}
+```
