diff --git a/src/binary-reversal/index.js b/src/binary-reversal/index.js
index 965bccf4..22843359 100644
--- a/src/binary-reversal/index.js
+++ b/src/binary-reversal/index.js
@@ -3,6 +3,21 @@
  *
  *  * @param {string} value
  */
-function binaryReversal(value) {}
+ function binaryReversal(value) {
+    var value = Number(value);
+    var valueInBinary = value.toString(2);
+
+    var binArray = valueInBinary.split('');
+    var num = valueInBinary.length
+    if (binArray.length < 8) {
+        for (let i = 0; i < (8 - num); i++) {
+            binArray.unshift('0');
+            
+        }
+    }
+    var reversal = binArray.reverse();
+    
+    return parseInt(reversal.join(''),2).toString();
+}
 
 module.exports = binaryReversal;
diff --git a/src/list-sorting/index.js b/src/list-sorting/index.js
index 6636c20d..1a76bd47 100644
--- a/src/list-sorting/index.js
+++ b/src/list-sorting/index.js
@@ -1,3 +1,52 @@
-function listSorting(needle, haystack) {}
+function listSorting(needle, haystack) {
+    var arr = haystack;
+    var index = '';
+    var answer = [];//level, indexOf
+    var holder = '';
+
+    if (typeof(arr[0]) === 'number') {
+        
+        for (let i = 0; i < arr.length; i++) {
+            if (arr[i] == needle) {
+                index = i;
+            }
+            
+        }
+    }else if(typeof(arr[0]) === "object"){
+        
+        for (let k = 0; k < arr.length; k++) {
+            if (arr[k].indexOf(needle) == -1) {
+                
+                continue;
+            }else{
+                if (typeof(arr[k][0] == 'number')) {
+                    
+                    for (let x = 0; x < arr[k].length; x++) {
+                        if (arr[k][x] == needle) {
+                            index = k;
+                            holder = x;
+                        }
+                        
+                    }
+                }
+            }
+            
+        }
+    }
+    answer.unshift(index);
+    if (holder !== '') {
+        answer.push(holder);
+    }
+    if (answer == '') {
+        return -1;
+    }else{
+        if (answer.length == 1) {
+            return Number(answer.join(''));
+        }else{
+            return answer;
+        }
+    }
+}
 
 module.exports = listSorting;
+