LeetCode problem solved on Jan 14th

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;

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();
+});