Added IsEven Function to Maths directory

Maths/IsEven.js

@@ -0,0 +1,19 @@
+/* Even Number: https://simple.wikipedia.org/wiki/Even_number
+ *
+ * function to check if number is even
+ * return true if number is even
+ * else false
+ */
+
+/**
+ * @param {number} number
+ * @return {boolean}
+ */
+
+const isEven = (number) => {
+  return (number & 1) === 0
+}
+
+// testing
+console.log(isEven(4))
+console.log(isEven(7))