diff --git a/lib/customUtils.js b/lib/customUtils.js
index b5f3057..1dfa06e 100644
--- a/lib/customUtils.js
+++ b/lib/customUtils.js
@@ -57,8 +57,26 @@ function deepCopy (obj) {
 }
 
 
+/**
+ * Return an array with the numbers from 0 to n-1, in a random order
+ * Used in the benchmarks
+ */
+function getRandomArray (n) {
+  var res, next;
+
+  if (n === 0) { return []; }
+  if (n === 1) { return [0]; }
+
+  res = getRandomArray(n - 1);
+  next = Math.floor(Math.random() * n);
+  res.splice(next, 0, n - 1);   // Add n-1 at a random position in the array
+
+  return res;
+}
+
 
 
 module.exports.ensureDirectoryExists = ensureDirectoryExists;
 module.exports.uid = uid;
 module.exports.deepCopy = deepCopy;
+module.exports.getRandomArray = getRandomArray;