From 87203f3b0f7b3b6963e8bac2a176fbf8dd418f40 Mon Sep 17 00:00:00 2001
From: Hidemichi Shimura <hidemichi.shimura@gmail.com>
Date: Sat, 14 Jan 2023 15:28:49 -0800
Subject: [PATCH 1/2] solve 1961. Check If String Is a Prefix of Array

---
 1961.check-if-string-is-a-prefix-of-array.js | 22 ++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 1961.check-if-string-is-a-prefix-of-array.js

diff --git a/1961.check-if-string-is-a-prefix-of-array.js b/1961.check-if-string-is-a-prefix-of-array.js
new file mode 100644
index 00000000..92d575e7
--- /dev/null
+++ b/1961.check-if-string-is-a-prefix-of-array.js
@@ -0,0 +1,22 @@
+/* URL of this problem
+ * https://leetcode.com/problems/check-if-string-is-a-prefix-of-array/description/
+ *
+ * @param {string} s
+ * @param {string[]} words
+ * @return {boolean}
+ */
+
+var isPrefixString = function(s, words) {
+    let str = "";
+
+    for (let i = 0; i < words.length; i++) {
+        str += words[i];
+
+        if (s === str) {
+            return true;
+        }
+    }
+    return false;
+};
+
+module.exports = isPrefixString;
\ No newline at end of file

From cda17bb5efa624ed249a861fb04807bfd3710ff4 Mon Sep 17 00:00:00 2001
From: Hidemichi Shimura <hidemichi.shimura@gmail.com>
Date: Sat, 14 Jan 2023 15:29:11 -0800
Subject: [PATCH 2/2] test function isPrefixString

---
 isPrefixString.test.js | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 isPrefixString.test.js

diff --git a/isPrefixString.test.js b/isPrefixString.test.js
new file mode 100644
index 00000000..cb81467f
--- /dev/null
+++ b/isPrefixString.test.js
@@ -0,0 +1,17 @@
+const isPrefixString = require("../jest-test/1961.check-if-string-is-a-prefix-of-array");
+
+test("Return true if the argument s can be made by concatinating the first k strings in the argument words", () => {
+    expect(isPrefixString("iloveleetcode", ["i","love","leetcode","apples"])).toBeTruthy();
+});
+
+test("Return false if the argument s can NOT be made by concatinating the first k strings in the argument words", () => {
+    expect(isPrefixString("iloveleetcode", ["apples","i","love","leetcode"])).toBeFalsy();
+});
+
+test("Return false if the argument s is empty", () => {
+    expect(isPrefixString("", ["i","love","leetcode","apples"])).toBeFalsy();
+});
+
+test("Return false if the argument words empty", () => {
+    expect(isPrefixString("iloveleetcode", [])).toBeFalsy();
+});
\ No newline at end of file