diff --git a/chapter06/example.js b/chapter06/example.js
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--- /dev/null
+++ b/chapter06/example.js
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+This is another question at the book, it is also a common interview question
+
+Determine if a number is prime using JavaScript
+
+function isPrime(value){
+  for(var i = 2; i < value; i++){
+    if(value % i === 0){
+        return false;
+     }
+  }
+  return value > 1;
+}
+
+isPrime(11);