From 2b28ed716d10937ceb4ee27bd9d3b3949b0461d6 Mon Sep 17 00:00:00 2001
From: Suryapratap Singh <suryprtaps@gmail.com>
Date: Fri, 20 Aug 2021 21:13:50 +0530
Subject: [PATCH] add CheckFlatCase method

---
 String/CheckFlatCase.js | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 String/CheckFlatCase.js

diff --git a/String/CheckFlatCase.js b/String/CheckFlatCase.js
new file mode 100644
index 000000000..7e842211b
--- /dev/null
+++ b/String/CheckFlatCase.js
@@ -0,0 +1,20 @@
+// CheckFlatCase method checks the given string is in flatcase or not.
+
+// Problem Source & Explanation: https://en.wikipedia.org/wiki/Naming_convention_(programming)
+
+/**
+ * CheckFlatCase method returns true if the string in flatcase, else return the false.
+ * @param {String} varname the name of the variable to check.
+ * @returns `Boolean` return true if the string is in flatcase, else return false.
+ */
+const CheckFlatCase = (varname) => {
+  // firstly, check that input is a string or not.
+  if (typeof varname !== 'string') {
+    return new TypeError('Argument is not a string.')
+  }
+
+  const pat = /^[a-z]*$/
+  return pat.test(varname)
+}
+
+module.exports = CheckFlatCase