diff --git a/src/binary-reversal/index.js b/src/binary-reversal/index.js
index 965bccf4..eb6ec648 100644
--- a/src/binary-reversal/index.js
+++ b/src/binary-reversal/index.js
@@ -3,6 +3,13 @@
  *
  *  * @param {string} value
  */
-function binaryReversal(value) {}
+function binaryReversal(value) {
+  var x = 793;
+  var y = x.toString(2);
+  var yl = y.length;
+  var mask = (Math.pow(2,yl)-1);
+  var result = -x & mask
+  document.write(result.toString(2)+"<br/>");
+}
 
 module.exports = binaryReversal;
diff --git a/src/list-sorting/index.js b/src/list-sorting/index.js
index 6636c20d..eb18607c 100644
--- a/src/list-sorting/index.js
+++ b/src/list-sorting/index.js
@@ -1,3 +1,4 @@
 function listSorting(needle, haystack) {}
 
+
 module.exports = listSorting;