diff --git a/gallery/javascript-comments-to-code/mathematical-operation-javascript.js b/gallery/javascript-comments-to-code/mathematical-operation-javascript.js
new file mode 100644
index 0000000..258875b
--- /dev/null
+++ b/gallery/javascript-comments-to-code/mathematical-operation-javascript.js
@@ -0,0 +1,29 @@
+// addition of two numbers
+function addition(a, b) {
+    return a + b;
+}
+
+// subtraction of two numbers
+function subtraction(a, b) {
+    return a - b;
+}
+
+// multiplication of two numbers
+function multiplication(a, b) {
+    return a * b;
+}
+
+// division of two numbers
+function division(a, b) {
+    return a / b;
+}
+
+// determine if it's a prime number
+function isPrime(num) {
+    for (var i = 2; i < num; i++) {
+        if (num % i === 0) {
+            return false;
+        }
+    }
+    return num > 1;
+}
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