diff --git a/src/binary-reversal/index.js b/src/binary-reversal/index.js
index 965bccf4..a08c4152 100644
--- a/src/binary-reversal/index.js
+++ b/src/binary-reversal/index.js
@@ -3,6 +3,11 @@
  *
  *  * @param {string} value
  */
-function binaryReversal(value) {}
+function binaryReversal(value) {
+  return String(parseInt([...
+    `0000000${Number(value).toString(2)}`.slice(-8)
+].reverse().join(""), 2));
+
+}
 
 module.exports = binaryReversal;
diff --git a/src/list-sorting/index.js b/src/list-sorting/index.js
index 6636c20d..75487965 100644
--- a/src/list-sorting/index.js
+++ b/src/list-sorting/index.js
@@ -1,3 +1,45 @@
-function listSorting(needle, haystack) {}
+function listSorting(needle, haystack) {
+  let rowIndex = [];
+  let colIndex= [];
+  let index = [];
+
+  if (haystack.length == 0) {
+    return -1;
+  }
+
+  for (let i = 0; i < haystack.length; i++) {
+    if (
+      Array.isArray(haystack[i]) === true &&
+      haystack[i].indexOf(needle) > -1
+    ) {
+      rowIndex.push(i);
+      colIndex.push(haystack[i].lastIndexOf(needle));
+    } else {
+      index.push(haystack.lastIndexOf(needle));
+    }
+  }
+
+  if (rowIndex.length > 1 && colIndex.indexOf(-1) === -1) {
+    return [
+      rowIndex[rowIndex.length - 1],
+      colIndex[colIndex.length - 1],
+    ];
+  }
+  if (rowIndex.length === 1 && colIndex.indexOf(-1) === -1) {
+    return [
+      rowIndex[rowIndex.length - 1],
+      colIndex[colIndex.length - 1],
+    ];
+  }
+  if (
+    rowIndex.length === 0 &&
+    colIndex.length === 0 &&
+    index.length > 0
+  ) {
+    return index[index.length - 1];
+  }
+
+  return -1;
+}
 
 module.exports = listSorting;