diff --git a/01_introduction_to_algorithms/ES6/01_binary_search.js b/01_introduction_to_algorithms/ES6/01_binary_search.js
index 7b3e218..83704d6 100644
--- a/01_introduction_to_algorithms/ES6/01_binary_search.js
+++ b/01_introduction_to_algorithms/ES6/01_binary_search.js
@@ -1,3 +1,9 @@
+/**
+ * Searches recursively number from the list
+ * @param {Array} list Source array
+ * @param {number} item Search item
+ * @returns {(number|null)} Number if the value is found or NULL otherwise
+ */
 const binarySearch = (list, item) => {
   let low = 0;
   let high = list.length - 1;
@@ -8,8 +14,7 @@ const binarySearch = (list, item) => {
 
     if (guess === item) {
       return mid;
-    }
-    if (guess > item) {
+    } else if (guess > item) {
       high = mid - 1;
     } else {
       low = mid + 1;
diff --git a/01_introduction_to_algorithms/ES6/02_recursive_binary_search.js b/01_introduction_to_algorithms/ES6/02_recursive_binary_search.js
index d203777..fd96dad 100644
--- a/01_introduction_to_algorithms/ES6/02_recursive_binary_search.js
+++ b/01_introduction_to_algorithms/ES6/02_recursive_binary_search.js
@@ -1,36 +1,34 @@
 /**
  * Searches recursively number from the list
- * @param {Array} list
+ * @param {Array} list Source array
  * @param {number} item Search item
  * @param {number} low Lower limit of search in the list
  * @param {number} high Highest limit of search in the list
- * @return {(number | null)} Number if the value is found or NULL otherwise
+ * @returns {(number|null)} Number if the value is found or NULL otherwise
  */
-const binarySearch = ( list, item, low = 0, high = list.length - 1 ) => {
-    let mid = Math.floor((low + high) / 2);
-    let guess = list[mid];
+const binarySearch = (list, item, low = 0, high = list.length - 1) => {
+  if (low > high) return null;
 
-    if ( low > high ) return null;
+  const mid = Math.floor((low + high) / 2);
+  const guess = list[mid];
 
-    if ( guess === item ) {
-        return mid;
-    } else if ( guess > item ) {
-        high = mid - 1;
-        return binarySearch( list, item, low, high );
-    } else {
-        low = mid + 1;
-        return binarySearch( list, item, low, high );
-    }
+  if (guess === item) {
+    return mid;
+  } else if (guess > item) {
+    return binarySearch(list, item, low, mid - 1);
+  } else {
+    return binarySearch(list, item, mid + 1, high);
+  }
 };
 
 /**
  * Creates the array that contains numbers 1...N
  * @param {number} n - number N
- * @return {Array}
+ * @returns {Array} Array that contains numbers 1...N
  */
-const createArr = ( n ) => Array.from({length: n}, (v, k) => k + 1);
+const createArr = n => Array.from({ length: n }, (v, k) => k + 1);
 
-const myList = createArr( 100 );
+const myList = createArr(100);
 
-console.log( binarySearch( myList, 3 ) ); // 2
-console.log( binarySearch( myList, -1 ) ); // null
+console.log(binarySearch(myList, 3)); // 2
+console.log(binarySearch(myList, -1)); // null
diff --git a/01_introduction_to_algorithms/javascript/01_binary_search.js b/01_introduction_to_algorithms/javascript/01_binary_search.js
index 1d5cc26..a9c27f4 100644
--- a/01_introduction_to_algorithms/javascript/01_binary_search.js
+++ b/01_introduction_to_algorithms/javascript/01_binary_search.js
@@ -1,22 +1,28 @@
-'use strict';
+"use strict";
 
+/**
+ * Searches recursively number from the list
+ * @param {Array} list Source array
+ * @param {number} item Search item
+ * @returns {(number|null)} Number if the value is found or NULL otherwise
+ */
 function binary_search(list, item) {
   let low = 0;
   let high = list.length - 1;
-  
+
   while (low <= high) {
-    let mid = Math.floor((low + high) / 2);
-    let guess = list[mid];
-    if (guess === item) {
+    const mid = Math.floor((low + high) / 2);
+    const guess = list[mid];
+
+    if (guess === item) {
       return mid;
-    }
-    if (guess > item) {
+    } else if (guess > item) {
       high = mid - 1;
     } else {
       low = mid + 1;
     }
   }
-  
+
   return null;
 }