implemented querystring function and wrote test for it with edge cases well

Author: fayaz551

Sprint-2/implement/querystring.js

@@ -1,16 +1,30 @@
 function parseQueryString(queryString) {
   const queryParams = {};
+
   if (queryString.length === 0) {
     return queryParams;
   }
+
   const keyValuePairs = queryString.split("&");
 
   for (const pair of keyValuePairs) {
-    const [key, value] = pair.split("=");
+    const index = pair.indexOf("=");
+
+    let key;
+    let value;
+
+    if (index === -1) {
+      key = pair;
+      value = "";
+    } else {
+      key = pair.slice(0, index);
+      value = pair.slice(index + 1);
+    }
+
     queryParams[key] = value;
   }
 
   return queryParams;
 }
 
-module.exports = parseQueryString;
+module.exports = parseQueryString;

Sprint-2/implement/querystring.test.js

@@ -10,3 +10,28 @@ test("parses querystring values containing =", () => {
     "equation": "x=y+1",
   });
 });
+
+test("parses querystring values containing &", () => {
+  expect(parseQueryString("equation=x&y=1")).toEqual({
+    "equation": "x",
+    "y": "1",
+  });
+});
+
+test("parses querystring values containing & and =", () => {
+  expect(parseQueryString("equation=x&y=1&formula=a=b+c")).toEqual({
+    "equation": "x",
+    "y": "1",
+    "formula": "a=b+c",
+  });
+});
+
+test("parses empty querystring", () => {
+  expect(parseQueryString("")).toEqual({});
+});
+
+test("parses querystring with no value", () => {
+  expect(parseQueryString("key")).toEqual({
+    "key": "",
+  });
+});