added is_even.js

DanielJDufour · Nov 22, 2022 · 1c72a67 · 1c72a67
1 parent da9d862
commit 1c72a67
Showing 1 changed file with 13 additions and 0 deletions.
diff --git a/is_even.js b/is_even.js
@@ -0,0 +1,13 @@
+const clean = require("./clean.js");
+const is_integer = require("./is_integer.js");
+
+function is_even(n) {
+  n = clean(n);
+
+  if (!is_integer(n)) throw new Error("can't call is_even on decimal");
+
+  return ["0", "2", "4", "6", "8"].includes(n.charAt(n.length - 1));
+}
+
+module.exports = is_even;
+module.exports.default = is_even;