LeetCode problem solved on Dec 28th

293.flip-game.js

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+/* URL of this problem
+ * https://leetcode.com/problems/flip-game/description/
+ *
+ * @param {string} currentState
+ * @return {string[]}
+ */
+
+var generatePossibleNextMoves = function(currentState) {
+    const PossibleStates = [];
+
+    for (let i = 0; i < currentState.length - 1; i++) {
+        const CurrentStateArr = [...currentState];
+
+        if (CurrentStateArr[i] === "+" && CurrentStateArr[i + 1] === "+") {
+            CurrentStateArr[i] = "-";
+            CurrentStateArr[i + 1] = "-";
+
+            PossibleStates.push(CurrentStateArr.join(""));
+        }
+    }
+
+    return PossibleStates;
+};
+
+module.exports = generatePossibleNextMoves;

generatePossibleNextMoves.test.js

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+const generatePossibleNextMoves = require("./293.flip-game");
+
+test("Return an array of all the possible states after one valid move", () => {
+    expect(generatePossibleNextMoves("++++")).toEqual(["--++","+--+","++--"]);
+});
+
+test("Return an empty array if the input currentState is made of only one of '+'", () => {
+    expect(generatePossibleNextMoves("+")).toEqual([]);
+});
+
+test("Return an empty array if the input currentState is an empty string", () => {
+    expect(generatePossibleNextMoves("")).toEqual([]);
+});
+
+test("Return an empty array if the input currentState comprises only '-", () => {
+    expect(generatePossibleNextMoves("----")).toEqual([]);
+});