diff --git a/src/binary-reversal/index.js b/src/binary-reversal/index.js
index 965bccf4..ed99025e 100644
--- a/src/binary-reversal/index.js
+++ b/src/binary-reversal/index.js
@@ -3,6 +3,15 @@
  *
  *  * @param {string} value
  */
-function binaryReversal(value) {}
+function binaryReversal(value) {
+    let binaryNum = parseInt(value)
+        let Binary = binaryNum.toString(2);
+        let padded = Binary.padStart(8, '0');
+        let paddedReversal = padded.split('').reverse().join('');
+        let reverseBinary = parseInt(paddedReversal,2).toString()
+    
+        return reverseBinary;
+    
+}
 
 module.exports = binaryReversal;
diff --git a/src/list-sorting/index.js b/src/list-sorting/index.js
index 6636c20d..82e49204 100644
--- a/src/list-sorting/index.js
+++ b/src/list-sorting/index.js
@@ -1,3 +1,18 @@
-function listSorting(needle, haystack) {}
+function listSorting(needle, haystack) {
+    if(!Array.isArray(haystack[0])){
+        return haystack.lastIndexOf(needle)
+    }
+    
+
+    for(let i = haystack.length -1; i >= 0; i--){
+        let j = haystack[i].lastIndexOf(needle);
+        if(j !== -1){
+            return [i,j]
+        }
+        
+    }
+    return -1
+
+}
 
 module.exports = listSorting;