diff --git a/9_BinarySearch/BinarySearch.js b/9_BinarySearch/BinarySearch.js
new file mode 100644
index 0000000..12add11
--- /dev/null
+++ b/9_BinarySearch/BinarySearch.js
@@ -0,0 +1,27 @@
+let BinarySearch = (list,val)=>{
+    let left = 0;
+    let right = list.length - 1;
+    let mid = Math.floor((left + right) / 2);
+
+    while (list[mid] !== val && left <= right) {
+        if (val < list[mid]) {
+            right = mid - 1
+        } else {
+            left = mid + 1
+        }
+        mid = Math.floor((left + right) / 2);
+    }
+    if (list[mid] === val) {
+        return mid;
+    } else {
+        return -1
+    }
+
+}
+;
+
+let list = [1,2,3,4,5,6,7,8]
+let val = 3;
+// should return 2
+
+BinarySearch(list, val);