From d1481372d3b39c36abc987b86579faeea2d73179 Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Sun, 1 Mar 2026 21:28:01 +0000
Subject: [PATCH 01/31] Updating the file with my rediction

---
 Sprint-2/debug/address.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Sprint-2/debug/address.js b/Sprint-2/debug/address.js
index 940a6af83..f83932257 100644
--- a/Sprint-2/debug/address.js
+++ b/Sprint-2/debug/address.js
@@ -1,4 +1,7 @@
 // Predict and explain first...
+//The issue with this program is that console.log is logging the address but is an obkect. address[0] only works for arrays. 
+//As address is an object, we must use a key rather than numeric indexes. 
+//Also there is no property called "0" inside address.
 
 // This code should log out the houseNumber from the address object
 // but it isn't working...

From 437f3a9723b410c4be81fb73d3963ac037fd253d Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Sun, 1 Mar 2026 21:29:03 +0000
Subject: [PATCH 02/31] Updating a spelling error

---
 Sprint-2/debug/address.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Sprint-2/debug/address.js b/Sprint-2/debug/address.js
index f83932257..c415e2ba6 100644
--- a/Sprint-2/debug/address.js
+++ b/Sprint-2/debug/address.js
@@ -1,5 +1,5 @@
 // Predict and explain first...
-//The issue with this program is that console.log is logging the address but is an obkect. address[0] only works for arrays. 
+//The issue with this program is that console.log is logging the address but is an object. address[0] only works for arrays. 
 //As address is an object, we must use a key rather than numeric indexes. 
 //Also there is no property called "0" inside address.
 

From 2556a19d227b1adc1aaa27cd04c39a3d8e82a1d1 Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Sun, 1 Mar 2026 21:29:59 +0000
Subject: [PATCH 03/31] Updating the program to correctly display the house
 number

---
 Sprint-2/debug/address.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Sprint-2/debug/address.js b/Sprint-2/debug/address.js
index c415e2ba6..d5d562082 100644
--- a/Sprint-2/debug/address.js
+++ b/Sprint-2/debug/address.js
@@ -15,4 +15,4 @@ const address = {
   postcode: "XYZ 123",
 };
 
-console.log(`My house number is ${address[0]}`);
+console.log(`My house number is ${address.houseNumber}`);

From 0503c00a486f4e8c4b5e61f380ab09a58e7cb739 Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Sun, 1 Mar 2026 21:37:39 +0000
Subject: [PATCH 04/31] Predicting why the program for author.js will not work

---
 Sprint-2/debug/author.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Sprint-2/debug/author.js b/Sprint-2/debug/author.js
index 8c2125977..1126f344c 100644
--- a/Sprint-2/debug/author.js
+++ b/Sprint-2/debug/author.js
@@ -1,4 +1,7 @@
 // Predict and explain first...
+// The issue with this program is that for.. of only works on iterable objects.
+// Plain JavaScript objects are not iterable, so this will throw a "TypeError".
+// To fix this, we can use Object.values(author) which converts the object's value into an array.
 
 // This program attempts to log out all the property values in the object.
 // But it isn't working. Explain why first and then fix the problem

From c5af2fc4f2795a949097b7cb3fb1df932b9e4766 Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Sun, 1 Mar 2026 21:39:50 +0000
Subject: [PATCH 05/31] Correcting the program to log all the object values of
 author

---
 Sprint-2/debug/author.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Sprint-2/debug/author.js b/Sprint-2/debug/author.js
index 1126f344c..1ee75deb0 100644
--- a/Sprint-2/debug/author.js
+++ b/Sprint-2/debug/author.js
@@ -14,6 +14,6 @@ const author = {
   alive: true,
 };
 
-for (const value of author) {
+for (const value of Object.values(author)) {
   console.log(value);
 }

From 0155ca2aabf7216dee73b99493d15e465077c2af Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Sun, 1 Mar 2026 21:42:02 +0000
Subject: [PATCH 06/31] Ensuring that the correct valyes are logged using node

---
 Sprint-2/debug/author.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Sprint-2/debug/author.js b/Sprint-2/debug/author.js
index 1ee75deb0..3de90cec5 100644
--- a/Sprint-2/debug/author.js
+++ b/Sprint-2/debug/author.js
@@ -16,4 +16,4 @@ const author = {
 
 for (const value of Object.values(author)) {
   console.log(value);
-}
+}
\ No newline at end of file

From 1f294322f5f0b198717152904fd20851a2a5802e Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Sun, 1 Mar 2026 21:51:12 +0000
Subject: [PATCH 07/31] Updating my prediction for recipe.js file

---
 Sprint-2/debug/recipe.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Sprint-2/debug/recipe.js b/Sprint-2/debug/recipe.js
index 6cbdd22cd..a7fd5e705 100644
--- a/Sprint-2/debug/recipe.js
+++ b/Sprint-2/debug/recipe.js
@@ -1,4 +1,9 @@
 // Predict and explain first...
+//The issue with this program is that ${recipe} inserts the entire object into the template string.
+// When an object is converted to a string, it becomes "[object Object]".
+//Instead we would need to access the ingredients array.
+//We can loop through recipe.ingredients or use join("\n")
+//This will print each ingredients on a new line.
 
 // This program should log out the title, how many it serves and the ingredients.
 // Each ingredient should be logged on a new line

From 09433a567ca9f372a4d31b209db9e61df24036e3 Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Sun, 1 Mar 2026 21:58:44 +0000
Subject: [PATCH 08/31] Updating the program for reciple.js so that it runs as
 expected

---
 Sprint-2/debug/recipe.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Sprint-2/debug/recipe.js b/Sprint-2/debug/recipe.js
index a7fd5e705..f39b7253b 100644
--- a/Sprint-2/debug/recipe.js
+++ b/Sprint-2/debug/recipe.js
@@ -16,5 +16,5 @@ const recipe = {
 };
 
 console.log(`${recipe.title} serves ${recipe.serves}
-  ingredients:
-${recipe}`);
+ingredients:
+${recipe.ingredients.join("\n")}`);
\ No newline at end of file

From 08b12a931d5ea5c212a1a094f7b55d9e0b9c8a61 Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Sun, 1 Mar 2026 22:22:03 +0000
Subject: [PATCH 09/31] Adding the implementaion of the program for contains.js

---
 Sprint-2/implement/contains.js | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/Sprint-2/implement/contains.js b/Sprint-2/implement/contains.js
index cd779308a..e6df0318b 100644
--- a/Sprint-2/implement/contains.js
+++ b/Sprint-2/implement/contains.js
@@ -1,3 +1,10 @@
-function contains() {}
-
+function contains(object, propertyName) {
+if (
+    typeof object !== "object" || 
+    object === null ||
+    Array.isArray(object)) {
+    return false;
+    }
+    return propertyName in object;
+}
 module.exports = contains;

From 557e87b5d2e22f23ca0d5559c88211b7b78db567 Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Sun, 1 Mar 2026 22:29:21 +0000
Subject: [PATCH 10/31] Adding test for when object is empty

---
 Sprint-2/implement/contains.test.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Sprint-2/implement/contains.test.js b/Sprint-2/implement/contains.test.js
index 326bdb1f2..5a3c31e6e 100644
--- a/Sprint-2/implement/contains.test.js
+++ b/Sprint-2/implement/contains.test.js
@@ -16,7 +16,9 @@ as the object doesn't contains a key of 'c'
 // Given a contains function
 // When passed an object and a property name
 // Then it should return true if the object contains the property, false otherwise
-
+test("contains on empty object return false", () => {
+    expect(contains({}, "a")).toBe(false);
+})
 // Given an empty object
 // When passed to contains
 // Then it should return false

From c79969ba2bd7d21ee09b9334d80d4cd74b748722 Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Sun, 1 Mar 2026 22:42:46 +0000
Subject: [PATCH 11/31] Adding test for when object contains property

---
 Sprint-2/implement/contains.test.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Sprint-2/implement/contains.test.js b/Sprint-2/implement/contains.test.js
index 5a3c31e6e..f4c8595bc 100644
--- a/Sprint-2/implement/contains.test.js
+++ b/Sprint-2/implement/contains.test.js
@@ -22,7 +22,9 @@ test("contains on empty object return false", () => {
 // Given an empty object
 // When passed to contains
 // Then it should return false
-test.todo("contains on empty object returns false");
+test("returns true when object contains property", () => {
+    expect(contains({a: 1,b: 2 }, "a")).toBe(true);
+});
 
 // Given an object with properties
 // When passed to contains with an existing property name

From 3747d911bea249199f79944a3b2e89dd25da640f Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Sun, 1 Mar 2026 22:52:16 +0000
Subject: [PATCH 12/31] Adding the other relevant tests and removing duplicated
 tests

---
 Sprint-2/implement/contains.test.js | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/Sprint-2/implement/contains.test.js b/Sprint-2/implement/contains.test.js
index f4c8595bc..8ec0e6ded 100644
--- a/Sprint-2/implement/contains.test.js
+++ b/Sprint-2/implement/contains.test.js
@@ -16,24 +16,31 @@ as the object doesn't contains a key of 'c'
 // Given a contains function
 // When passed an object and a property name
 // Then it should return true if the object contains the property, false otherwise
-test("contains on empty object return false", () => {
-    expect(contains({}, "a")).toBe(false);
-})
+
 // Given an empty object
 // When passed to contains
 // Then it should return false
-test("returns true when object contains property", () => {
-    expect(contains({a: 1,b: 2 }, "a")).toBe(true);
+test("returns false for empty object", () => {
+  expect(contains({}, "a")).toBe(false);
 });
 
 // Given an object with properties
 // When passed to contains with an existing property name
 // Then it should return true
+test("returns true when object contains property", () => {
+  expect(contains({ a: 1, b: 2 }, "a")).toBe(true);
+});
 
 // Given an object with properties
 // When passed to contains with a non-existent property name
 // Then it should return false
+test("returns false when object does not contain property", () => {
+  expect(contains({ a: 1, b: 2 }, "c")).toBe(false);
+});
 
 // Given invalid parameters like an array
 // When passed to contains
 // Then it should return false or throw an error
+test("returns false for invalid input (array)", () => {
+    expect(contains(["a", "b"], "a")).toBe(false);
+});
\ No newline at end of file

From f440646e707cc74046c1956d9a4d5bb4cd91ba2c Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Sun, 1 Mar 2026 23:25:54 +0000
Subject: [PATCH 13/31] Adding the program implementation for lookup.js

---
 Sprint-2/implement/lookup.js | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/Sprint-2/implement/lookup.js b/Sprint-2/implement/lookup.js
index a6746e07f..b5414458a 100644
--- a/Sprint-2/implement/lookup.js
+++ b/Sprint-2/implement/lookup.js
@@ -1,5 +1,12 @@
-function createLookup() {
-  // implementation here
+function createLookup(pairs) {
+const result = {};
+for (const pair of pairs) {
+  const countryCode = pair[0];
+  const currencyCode = pair[1];
+  result[countryCode] = currencyCode;
+}
+
+return result;
 }
 
 module.exports = createLookup;

From 655fc119abe8937a3b1b3a175220cedaf0fb6524 Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Sun, 1 Mar 2026 23:32:15 +0000
Subject: [PATCH 14/31] Adding relevant tests

---
 Sprint-2/implement/lookup.test.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/Sprint-2/implement/lookup.test.js b/Sprint-2/implement/lookup.test.js
index 547e06c5a..8a44c9655 100644
--- a/Sprint-2/implement/lookup.test.js
+++ b/Sprint-2/implement/lookup.test.js
@@ -1,6 +1,12 @@
 const createLookup = require("./lookup.js");
 
-test.todo("creates a country currency code lookup for multiple codes");
+test("creates a country currency code lookup for multiple codes", () => {
+  const input = [['US', 'USD'], ['CA', 'CAD']];
+  expect(createLookup(input)).toEqual({
+    US: 'USD',
+    CA: 'CAD'
+  });
+});
 
 /*
 

From bd478a09b3fc95a815b7fa334189d16711fc5b93 Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Mon, 2 Mar 2026 19:34:30 +0000
Subject: [PATCH 15/31] Correcting the program by testing the program in Node
 REPL

---
 Sprint-2/implement/querystring.js | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/Sprint-2/implement/querystring.js b/Sprint-2/implement/querystring.js
index 45ec4e5f3..a9de58140 100644
--- a/Sprint-2/implement/querystring.js
+++ b/Sprint-2/implement/querystring.js
@@ -1,12 +1,22 @@
 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 equalsIndex = pair.indexOf("=");
+
+    if (equalsIndex === -1) {
+      queryParams[pair] = "";
+      continue;
+    }
+    const key = pair.slice(0, equalsIndex);
+    const value = pair.slice(equalsIndex + 1);
+
     queryParams[key] = value;
   }
 

From 695ad7584e777ecb72abeba2280acf2bd4573d17 Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Mon, 2 Mar 2026 19:38:27 +0000
Subject: [PATCH 16/31] Adding a test to cover the empty input condition

---
 Sprint-2/implement/querystring.test.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Sprint-2/implement/querystring.test.js b/Sprint-2/implement/querystring.test.js
index 3e218b789..3764296f8 100644
--- a/Sprint-2/implement/querystring.test.js
+++ b/Sprint-2/implement/querystring.test.js
@@ -10,3 +10,8 @@ test("parses querystring values containing =", () => {
     "equation": "x=y+1",
   });
 });
+
+// Empty Input
+test("returns empty object for empty string", () => {
+  expect(parseQueryString("")).toEqual({});
+});
\ No newline at end of file

From fb3189e173e344b1d8acde98887dca670753f73e Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Mon, 2 Mar 2026 19:39:31 +0000
Subject: [PATCH 17/31] Adding a test case for single key/value pairs

---
 Sprint-2/implement/querystring.test.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Sprint-2/implement/querystring.test.js b/Sprint-2/implement/querystring.test.js
index 3764296f8..cb69b6eb1 100644
--- a/Sprint-2/implement/querystring.test.js
+++ b/Sprint-2/implement/querystring.test.js
@@ -14,4 +14,9 @@ test("parses querystring values containing =", () => {
 // Empty Input
 test("returns empty object for empty string", () => {
   expect(parseQueryString("")).toEqual({});
+});
+
+// Normal single pair
+test("parses a single key/value pair", () => {
+  expect(parseQueryString("a=1")).toEqual({ a: "1" });
 });
\ No newline at end of file

From 3b6e4620cff19285162d10f6949a9e4d60e647ac Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Mon, 2 Mar 2026 19:40:01 +0000
Subject: [PATCH 18/31] Adding a test case for normal multiple pairs

---
 Sprint-2/implement/querystring.test.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Sprint-2/implement/querystring.test.js b/Sprint-2/implement/querystring.test.js
index cb69b6eb1..7258a737c 100644
--- a/Sprint-2/implement/querystring.test.js
+++ b/Sprint-2/implement/querystring.test.js
@@ -19,4 +19,9 @@ test("returns empty object for empty string", () => {
 // Normal single pair
 test("parses a single key/value pair", () => {
   expect(parseQueryString("a=1")).toEqual({ a: "1" });
+});
+
+// Normal multiple pairs
+test("parses multiple key/value pairs", () => {
+  expect(parseQueryString("a=1&b=2")).toEqual({ a: "1", b: "2" });
 });
\ No newline at end of file

From c4ab525411699b2487d4a1caae267ec9e35cc92c Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Mon, 2 Mar 2026 19:41:59 +0000
Subject: [PATCH 19/31] Adding a test case for empty strings

---
 Sprint-2/implement/querystring.test.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Sprint-2/implement/querystring.test.js b/Sprint-2/implement/querystring.test.js
index 7258a737c..c034de5fa 100644
--- a/Sprint-2/implement/querystring.test.js
+++ b/Sprint-2/implement/querystring.test.js
@@ -24,4 +24,9 @@ test("parses a single key/value pair", () => {
 // Normal multiple pairs
 test("parses multiple key/value pairs", () => {
   expect(parseQueryString("a=1&b=2")).toEqual({ a: "1", b: "2" });
+});
+
+// Empty value should be an empty string
+test("handles a key with an empty value", () => {
+  expect(parseQueryString("a=")).toEqual({ a: "" });
 });
\ No newline at end of file

From e161802c458334a1f5013336612ffe6025c6387f Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Mon, 2 Mar 2026 20:05:23 +0000
Subject: [PATCH 20/31] Adding the implementation of the program for tally.js

---
 Sprint-2/implement/tally.js | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/Sprint-2/implement/tally.js b/Sprint-2/implement/tally.js
index f47321812..7f9920847 100644
--- a/Sprint-2/implement/tally.js
+++ b/Sprint-2/implement/tally.js
@@ -1,3 +1,17 @@
-function tally() {}
+function tally(items) {
+    if (!Array.isArray(items)){
+        throw new Error("Input must be an array");
+    }
+    const result = {};
+
+    for (const item of items) {
+        if (result[item]) {
+            result[item] += 1;
+        } else {
+            result[item] = 1;
+        }
+    }
+    return result;
+    }
 
 module.exports = tally;

From d4d6ace90c524bb33f67daf9bd9b204915a552ca Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Mon, 2 Mar 2026 20:09:09 +0000
Subject: [PATCH 21/31] Adding a test case for tallying on an empty array

---
 Sprint-2/implement/tally.test.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Sprint-2/implement/tally.test.js b/Sprint-2/implement/tally.test.js
index 2ceffa8dd..ff3674536 100644
--- a/Sprint-2/implement/tally.test.js
+++ b/Sprint-2/implement/tally.test.js
@@ -23,7 +23,9 @@ const tally = require("./tally.js");
 // Given an empty array
 // When passed to tally
 // Then it should return an empty object
-test.todo("tally on an empty array returns an empty object");
+test("tally on an empty array returns an empty object", () => {
+    expect(tally([])).toEqual({});
+});
 
 // Given an array with duplicate items
 // When passed to tally

From b6f691ec16fc74589dde3193c1056f97d048d194 Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Mon, 2 Mar 2026 20:10:27 +0000
Subject: [PATCH 22/31] Adding a test case for counting the freqency of items
 within an array

---
 Sprint-2/implement/tally.test.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Sprint-2/implement/tally.test.js b/Sprint-2/implement/tally.test.js
index ff3674536..db1e36f21 100644
--- a/Sprint-2/implement/tally.test.js
+++ b/Sprint-2/implement/tally.test.js
@@ -30,6 +30,13 @@ test("tally on an empty array returns an empty object", () => {
 // Given an array with duplicate items
 // When passed to tally
 // Then it should return counts for each unique item
+test("counts frequency of items in array", () => {
+  expect(tally(['a', 'a', 'b', 'c'])).toEqual({
+    a: 2,
+    b: 1,
+    c: 1
+  });
+});
 
 // Given an invalid input like a string
 // When passed to tally

From 34f680a9d2dc45de30f64454a14ec0f649add061 Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Mon, 2 Mar 2026 20:11:38 +0000
Subject: [PATCH 23/31] Adding a test case for a invalid input

---
 Sprint-2/implement/tally.test.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Sprint-2/implement/tally.test.js b/Sprint-2/implement/tally.test.js
index db1e36f21..811780f35 100644
--- a/Sprint-2/implement/tally.test.js
+++ b/Sprint-2/implement/tally.test.js
@@ -41,3 +41,6 @@ test("counts frequency of items in array", () => {
 // Given an invalid input like a string
 // When passed to tally
 // Then it should throw an error
+test("throws error for invalid input", () => {
+  expect(() => tally("abc")).toThrow();
+});
\ No newline at end of file

From efc7a77aa0ed4c879659bb41e60ff3ed0044eb2f Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Mon, 2 Mar 2026 21:01:17 +0000
Subject: [PATCH 24/31] Answering questeion A) using node REPL

---
 Sprint-2/interpret/invert.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Sprint-2/interpret/invert.js b/Sprint-2/interpret/invert.js
index bb353fb1f..916f07d76 100644
--- a/Sprint-2/interpret/invert.js
+++ b/Sprint-2/interpret/invert.js
@@ -16,8 +16,9 @@ function invert(obj) {
   return invertedObj;
 }
 
+module.exports = invert;
 // a) What is the current return value when invert is called with { a : 1 }
-
+// The current return value when invert is called with { a : 1 } is { key: 1 }
 // b) What is the current return value when invert is called with { a: 1, b: 2 }
 
 // c) What is the target return value when invert is called with {a : 1, b: 2}

From afc21f690c051101b3944f48821c077ee861b772 Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Mon, 2 Mar 2026 21:49:48 +0000
Subject: [PATCH 25/31] Adding the answer to question B) using node REPL

---
 Sprint-2/interpret/invert.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Sprint-2/interpret/invert.js b/Sprint-2/interpret/invert.js
index 916f07d76..ca56ca567 100644
--- a/Sprint-2/interpret/invert.js
+++ b/Sprint-2/interpret/invert.js
@@ -19,7 +19,10 @@ function invert(obj) {
 module.exports = invert;
 // a) What is the current return value when invert is called with { a : 1 }
 // The current return value when invert is called with { a : 1 } is { key: 1 }
+
 // b) What is the current return value when invert is called with { a: 1, b: 2 }
+// When calling invert({ a: 1, b: 2 }); the loop runs twice, the first iteration outputs invertedObj.key = 1l
+// The second iterations overwrites the first, so the current value returned is { key: 2 }
 
 // c) What is the target return value when invert is called with {a : 1, b: 2}
 

From e48cbff29b281d0bf363b592af5710b5d0e907ed Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Mon, 2 Mar 2026 22:11:45 +0000
Subject: [PATCH 26/31] Adding the answer for question C) using node REPL to
 debug and fix the code

---
 Sprint-2/interpret/invert.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Sprint-2/interpret/invert.js b/Sprint-2/interpret/invert.js
index ca56ca567..cb5cae46e 100644
--- a/Sprint-2/interpret/invert.js
+++ b/Sprint-2/interpret/invert.js
@@ -10,7 +10,7 @@ function invert(obj) {
   const invertedObj = {};
 
   for (const [key, value] of Object.entries(obj)) {
-    invertedObj.key = value;
+    invertedObj[value] = key;
   }
 
   return invertedObj;
@@ -25,6 +25,9 @@ module.exports = invert;
 // The second iterations overwrites the first, so the current value returned is { key: 2 }
 
 // c) What is the target return value when invert is called with {a : 1, b: 2}
+// The target output should swap keys and value, therefore the output using Node REPL is { '1': 'a', '2': 'b' }
+// After fixing the bug in the code. The values become keys, and the keys become the values. 
+// Object keys are stored as strings. 
 
 // c) What does Object.entries return? Why is it needed in this program?
 

From ee94815ad4cce72afa20c257def6eb630ee68b10 Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Mon, 2 Mar 2026 22:51:57 +0000
Subject: [PATCH 27/31] Correct the question letters for easy readability

---
 Sprint-2/interpret/invert.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/Sprint-2/interpret/invert.js b/Sprint-2/interpret/invert.js
index cb5cae46e..bb5d6cb00 100644
--- a/Sprint-2/interpret/invert.js
+++ b/Sprint-2/interpret/invert.js
@@ -29,8 +29,8 @@ module.exports = invert;
 // After fixing the bug in the code. The values become keys, and the keys become the values. 
 // Object keys are stored as strings. 
 
-// c) What does Object.entries return? Why is it needed in this program?
+// d) What does Object.entries return? Why is it needed in this program?
 
-// d) Explain why the current return value is different from the target output
+// e) Explain why the current return value is different from the target output
 
-// e) Fix the implementation of invert (and write tests to prove it's fixed!)
+// f) Fix the implementation of invert (and write tests to prove it's fixed!)

From bcc383cfadaf205bfaaa8c417459d84c696d8061 Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Mon, 2 Mar 2026 22:59:44 +0000
Subject: [PATCH 28/31] Adding the answer for D)

---
 Sprint-2/interpret/invert.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Sprint-2/interpret/invert.js b/Sprint-2/interpret/invert.js
index bb5d6cb00..79c94b8a3 100644
--- a/Sprint-2/interpret/invert.js
+++ b/Sprint-2/interpret/invert.js
@@ -30,6 +30,8 @@ module.exports = invert;
 // Object keys are stored as strings. 
 
 // d) What does Object.entries return? Why is it needed in this program?
+// Object.entries({ a: 1, b: 2}) return [["a", 1]], ["b", 2]]
+// It is needed because objects are not iterable with for...of, but the entries array is, so we can loop key/value pairs.
 
 // e) Explain why the current return value is different from the target output
 

From 899dadc327caffdc7b4d2ef9800d196c9d8ab40e Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Mon, 2 Mar 2026 23:03:50 +0000
Subject: [PATCH 29/31] Adding the answer for question e)

---
 Sprint-2/interpret/invert.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Sprint-2/interpret/invert.js b/Sprint-2/interpret/invert.js
index 79c94b8a3..18f688515 100644
--- a/Sprint-2/interpret/invert.js
+++ b/Sprint-2/interpret/invert.js
@@ -25,7 +25,7 @@ module.exports = invert;
 // The second iterations overwrites the first, so the current value returned is { key: 2 }
 
 // c) What is the target return value when invert is called with {a : 1, b: 2}
-// The target output should swap keys and value, therefore the output using Node REPL is { '1': 'a', '2': 'b' }
+// The target output should swap keys and value, therefore the output (using Node REPL) after the fix is { '1': 'a', '2': 'b' }
 // After fixing the bug in the code. The values become keys, and the keys become the values. 
 // Object keys are stored as strings. 
 
@@ -34,5 +34,7 @@ module.exports = invert;
 // It is needed because objects are not iterable with for...of, but the entries array is, so we can loop key/value pairs.
 
 // e) Explain why the current return value is different from the target output
+// In the code (before the bug fix) invertedObj.key = value creates a literal property called "key" each time, overwriting it.
+// It does not use the variable key/value for dynamic property names, so it can't swap keys and values correctly.
 
 // f) Fix the implementation of invert (and write tests to prove it's fixed!)

From 444d8d9065da60782d42a269a8a11264b83de50e Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Mon, 2 Mar 2026 23:11:11 +0000
Subject: [PATCH 30/31] Adding a file to seperate tests and program logic for
 clear readibility and structure

---
 Sprint-2/interpret/invert.test.js | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 Sprint-2/interpret/invert.test.js

diff --git a/Sprint-2/interpret/invert.test.js b/Sprint-2/interpret/invert.test.js
new file mode 100644
index 000000000..dd11607e0
--- /dev/null
+++ b/Sprint-2/interpret/invert.test.js
@@ -0,0 +1,5 @@
+const invert = require("./invert.js");
+
+test("inverts a single key value pair", () => {
+    expect(invert({ a: 1 })).toEqual({ "1": "a" });
+});
\ No newline at end of file

From c885402388bbd83f3d29463955564a59a77c2f70 Mon Sep 17 00:00:00 2001
From: KayanatSuleman <kayanat.suleman@yahoo.co.uk>
Date: Mon, 2 Mar 2026 23:13:34 +0000
Subject: [PATCH 31/31] Adding more test to cover other instances

---
 Sprint-2/interpret/invert.test.js | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Sprint-2/interpret/invert.test.js b/Sprint-2/interpret/invert.test.js
index dd11607e0..5e678a493 100644
--- a/Sprint-2/interpret/invert.test.js
+++ b/Sprint-2/interpret/invert.test.js
@@ -2,4 +2,15 @@ const invert = require("./invert.js");
 
 test("inverts a single key value pair", () => {
     expect(invert({ a: 1 })).toEqual({ "1": "a" });
+});
+
+test("inverts multiple key value pairs", () => {
+    expect(invert({ a: 1, b: 2 })).toEqual({ 
+        "1": "a", 
+        "2": "b"
+    });
+});
+
+test("returns empty object when given empty object", () => {
+  expect(invert({})).toEqual({});
 });
\ No newline at end of file