From b310c6dcca6765d66f0cf980627d46503e36a198 Mon Sep 17 00:00:00 2001
From: Danica Shen <zhaodanica@gmail.com>
Date: Fri, 20 Jan 2023 17:40:48 +0000
Subject: [PATCH] feat(mme-17212): convert shared/module/string-utils.js ->
 Typescript (#17320)

---
 shared/modules/string-utils.js      | 10 ----------
 shared/modules/string-utils.test.js | 27 +++++++++++++++++++++++++++
 shared/modules/string-utils.ts      | 29 +++++++++++++++++++++++++++++
 3 files changed, 56 insertions(+), 10 deletions(-)
 delete mode 100644 shared/modules/string-utils.js
 create mode 100644 shared/modules/string-utils.test.js
 create mode 100644 shared/modules/string-utils.ts

diff --git a/shared/modules/string-utils.js b/shared/modules/string-utils.js
deleted file mode 100644
index c8a1c0e87..000000000
--- a/shared/modules/string-utils.js
+++ /dev/null
@@ -1,10 +0,0 @@
-export function isEqualCaseInsensitive(value1, value2) {
-  if (typeof value1 !== 'string' || typeof value2 !== 'string') {
-    return false;
-  }
-  return value1.toLowerCase() === value2.toLowerCase();
-}
-
-export function prependZero(num, maxLength) {
-  return num.toString().padStart(maxLength, '0');
-}
diff --git a/shared/modules/string-utils.test.js b/shared/modules/string-utils.test.js
new file mode 100644
index 000000000..cf3ffa040
--- /dev/null
+++ b/shared/modules/string-utils.test.js
@@ -0,0 +1,27 @@
+import { isEqualCaseInsensitive, prependZero } from './string-utils';
+
+describe('string-utils', () => {
+  describe('isEqualCaseInsensitive', () => {
+    it('should return true for FOO and foo', () => {
+      expect(isEqualCaseInsensitive('FOO', 'foo')).toBeTruthy();
+    });
+
+    it('should return false for foo and Bar', () => {
+      expect(isEqualCaseInsensitive('foo', 'Bar')).toBeFalsy();
+    });
+
+    it('should return false for number and string comparision', () => {
+      expect(isEqualCaseInsensitive('foo', 123)).toBeFalsy();
+    });
+  });
+
+  describe('prependZero', () => {
+    it('should return number to given max length string when digit is smaller than maxLength', () => {
+      expect(prependZero(123, 4)).toStrictEqual('0123');
+    });
+
+    it('should return number to given max length string when digit is large than maxLength', () => {
+      expect(prependZero(123, 2)).toStrictEqual('123');
+    });
+  });
+});
diff --git a/shared/modules/string-utils.ts b/shared/modules/string-utils.ts
new file mode 100644
index 000000000..248463dd1
--- /dev/null
+++ b/shared/modules/string-utils.ts
@@ -0,0 +1,29 @@
+/**
+ * Compare 2 given strings and return boolean
+ * eg: "foo" and "FOO" => true
+ * eg: "foo" and "bar" => false
+ * eg: "foo" and 123 => false
+ *
+ * @param value1 - first string to compare
+ * @param value2 - first string to compare
+ * @returns true if 2 strings are identical when they are lowercase
+ */
+export function isEqualCaseInsensitive(
+  value1: string,
+  value2: string,
+): boolean {
+  if (typeof value1 !== 'string' || typeof value2 !== 'string') {
+    return false;
+  }
+  return value1.toLowerCase() === value2.toLowerCase();
+}
+
+/**
+ * Takes a number with max length until the resulting string reaches the given length
+ *
+ * @param num
+ * @param maxLength
+ */
+export function prependZero(num: number, maxLength: number): string {
+  return num.toString().padStart(maxLength, '0');
+}