diff --git a/src/binary-reversal/index.js b/src/binary-reversal/index.js
index 965bccf4..c7067784 100644
--- a/src/binary-reversal/index.js
+++ b/src/binary-reversal/index.js
@@ -3,6 +3,17 @@
  *
  *  * @param {string} value
  */
-function binaryReversal(value) {}
+ function binaryReversal(value) {
+
+    let t = value.toString(2).split("");
+    let str_len = t.length;
+    for (let i = 0; i < 8 - str_len; i++) {
+        t.unshift("0");
+    }
+    return parseInt(t.reverse().join(""), 2);
+}
+// 14 -> 00001110 -> 01110000 -> 112
+console.log(binaryReversal(121));
+
 
 module.exports = binaryReversal;
diff --git a/src/binary-reversal/test.js b/src/binary-reversal/test.js
index 5ea0811d..cde33551 100644
--- a/src/binary-reversal/test.js
+++ b/src/binary-reversal/test.js
@@ -1,13 +1,15 @@
-const binaryReversal = require(".");
+function binaryReversal (str) {
+    // code goes here  
+    let num = parseInt(str);
+    let binary = num.toString(2);
+    let reverse = binary.split("").reverse().join("");
+    let newNum = parseInt(reverse, 2);
+    let final = newNum.toString(10);
+    return final;
+  }
 
-describe("Binary Reversal Spec", () => {
-  test("It passes the basics", () => {
-    expect(binaryReversal("1")).toBe("128");
-    expect(binaryReversal("10")).toBe("80");
-    expect(binaryReversal("45")).toBe("180");
-    expect(binaryReversal("100")).toBe("38");
-    expect(binaryReversal("111")).toBe("246");
-    expect(binaryReversal("121")).toBe("158");
-    expect(binaryReversal("200")).toBe("19");
-  });
-});
+    console.log(binaryReversal("47"));
+    console.log(binaryReversal("213"));
+    console.log(binaryReversal("4567"));
+
+    module.exports = binaryReversal;
diff --git a/src/list-sorting/index.js b/src/list-sorting/index.js
index 6636c20d..2b984e04 100644
--- a/src/list-sorting/index.js
+++ b/src/list-sorting/index.js
@@ -1,3 +1,17 @@
-function listSorting(needle, haystack) {}
+    /**
+ * @param {string} haystack
+ * @param {string} needle
+ * @return {number}
+ */
+ function listSorting(haystack, needle) {
+    // code goes here  
+    let arr = haystack.split(",");
+    let sorted = arr.sort();
+    let index = sorted.indexOf(needle);
+    return index;
+  }
+
+    console.log(listSorting("hello,world,here,i,am", "world"));
+
 
 module.exports = listSorting;