diff --git a/Sprint-1/fix/median.js b/Sprint-1/fix/median.js
index b22590bc6..42c608dba 100644
--- a/Sprint-1/fix/median.js
+++ b/Sprint-1/fix/median.js
@@ -6,9 +6,26 @@
 // or 'list' has mixed values (the function is expected to sort only numbers).
 
 function calculateMedian(list) {
-  const middleIndex = Math.floor(list.length / 2);
-  const median = list.splice(middleIndex, 1)[0];
-  return median;
+  if (!Array.isArray(list)) {
+    return null; // Return null if input is not an array
+  }
+  // Filter only numeric values
+  const filteredlist = list.filter((item) => typeof item === "number");
+
+  // Return null if no numeric values are present
+  if (filteredlist.length === 0) {
+    return null;
+  }
+  // sort the numbers
+  filteredlist.sort((a, b) => a - b);
+  const middleIndex = Math.floor(filteredlist.length / 2);
+
+  // calculate and return median
+  if (filteredlist.length % 2 === 0) {
+    return (filteredlist[middleIndex - 1] + filteredlist[middleIndex]) / 2;
+  } else {
+    return filteredlist[middleIndex];
+  }
 }
 
 module.exports = calculateMedian;
diff --git a/Sprint-1/implement/dedupe.js b/Sprint-1/implement/dedupe.js
index 781e8718a..2cafc1da6 100644
--- a/Sprint-1/implement/dedupe.js
+++ b/Sprint-1/implement/dedupe.js
@@ -1 +1,15 @@
-function dedupe() {}
+function dedupe(array) {
+  if (!Array.isArray(array)) {
+    return [];
+  }
+
+  const result = [];
+  for (let item of array) {
+    if (!result.includes(item)) {
+      result.push(item);
+    }
+  }
+  return result;
+}
+
+module.exports = dedupe;
diff --git a/Sprint-1/implement/dedupe.test.js b/Sprint-1/implement/dedupe.test.js
index 23e0f8638..f7e3df114 100644
--- a/Sprint-1/implement/dedupe.test.js
+++ b/Sprint-1/implement/dedupe.test.js
@@ -16,7 +16,30 @@ E.g. dedupe([1, 2, 1]) target output: [1, 2]
 // Given an empty array
 // When passed to the dedupe function
 // Then it should return an empty array
-test.todo("given an empty array, it returns an empty array");
+test("given an empty array, it returns an empty array", () => {
+  expect(dedupe([])).toEqual([]);
+});
+
+test("given an array with no duplicates, it returns the same array", () => {
+  expect(dedupe([1, 2, 3])).toEqual([1, 2, 3]);
+  expect(dedupe(["a", "b", "c"])).toEqual(["a", "b", "c"]);
+});
+
+test("removes duplicate from an array of numbers", () => {
+  expect(dedupe([5, 1, 1, 2, 3, 2, 5, 8])).toEqual([5, 1, 2, 3, 8]);
+});
+
+test("removes duplicate from an array of strings", () => {
+  expect(dedupe(["a", "a", "b", "b", "c"])).toEqual(["a", "b", "c"]);
+});
+
+test("preserves the order of first occurrences", () => {
+  expect(dedupe([3, 1, 2, 2, 1])).toEqual([3, 1, 2]);
+});
+
+test("handles mixed types correctly", () => {
+  expect(dedupe([1, "1", 1, "1"])).toEqual([1, "1"]);
+});
 
 // Given an array with no duplicates
 // When passed to the dedupe function
diff --git a/Sprint-1/implement/max.js b/Sprint-1/implement/max.js
index 6dd76378e..4b2d6a22f 100644
--- a/Sprint-1/implement/max.js
+++ b/Sprint-1/implement/max.js
@@ -1,4 +1,15 @@
 function findMax(elements) {
+  const numericElements = elements.filter(
+    (elements) => typeof elements === "number"
+  ); // filter out only numeric values
+
+  // If there are no numeric values, return infinity
+  if (numericElements.length === 0) {
+    return Infinity;
+  }
+
+  // use Math.max with spread (...) to get the maximum number
+  return Math.max(...numericElements);
 }
 
 module.exports = findMax;
diff --git a/Sprint-1/implement/max.test.js b/Sprint-1/implement/max.test.js
index 82f18fd88..4b4582f9e 100644
--- a/Sprint-1/implement/max.test.js
+++ b/Sprint-1/implement/max.test.js
@@ -16,7 +16,33 @@ const findMax = require("./max.js");
 // When passed to the max function
 // Then it should return -Infinity
 // Delete this test.todo and replace it with a test.
-test.todo("given an empty array, returns -Infinity");
+test("given an empty array, returns -Infinity", () => {
+  expect(findMax([])).toBe(Infinity);
+});
+
+test("given an  array with one number, return that number", () => {
+  expect(findMax([42])).toBe(42);
+});
+
+test("given positive and negative numbers, return the largest number", () => {
+  expect(findMax([3, -10, 20, 7, -4])).toBe(20);
+});
+
+test("given only negative numbers, return the closest one to zero", () => {
+  expect(findMax([-5, -10, -3, -8])).toBe(-3);
+});
+
+test("given decimal numbers, return the  largest decimal number", () => {
+  expect(findMax([1.5, 2.3, 0.4, 0.1])).toBe(2.3);
+});
+
+test("ignores non-numeric values", () => {
+  expect(findMax([10, "a", true, 50, null, 40])).toBe(50);
+});
+
+test("given only non-number values, returns -Infinity", () => {
+  expect(findMax(["a", "h", undefined, null])).toBe(Infinity);
+});
 
 // Given an array with one number
 // When passed to the max function
diff --git a/Sprint-1/implement/sum.js b/Sprint-1/implement/sum.js
index 9062aafe3..8bb3d3f95 100644
--- a/Sprint-1/implement/sum.js
+++ b/Sprint-1/implement/sum.js
@@ -1,4 +1,9 @@
 function sum(elements) {
+  // Filter for numbers only
+  const numericValues = elements.filter((item) => typeof item === "number");
+
+  // Add the  numbers
+  return numericValues.reduce((total, num) => total + num, 0);
 }
 
 module.exports = sum;
diff --git a/Sprint-1/implement/sum.test.js b/Sprint-1/implement/sum.test.js
index dd0a090ca..c8b069d7b 100644
--- a/Sprint-1/implement/sum.test.js
+++ b/Sprint-1/implement/sum.test.js
@@ -13,7 +13,13 @@ const sum = require("./sum.js");
 // Given an empty array
 // When passed to the sum function
 // Then it should return 0
-test.todo("given an empty array, returns 0")
+test("given an empty array, returns 0", () => {
+  expect(sum([])).toBe(0);
+});
+
+test("given an array with one number, return that number", () => {
+  expect(sum([42])).toBe(42);
+});
 
 // Given an array with just one number
 // When passed to the sum function
@@ -22,15 +28,26 @@ test.todo("given an empty array, returns 0")
 // Given an array containing negative numbers
 // When passed to the sum function
 // Then it should still return the correct total sum
+test("given an array with negative numbers, returns the correct total sum", () => {
+  expect(sum([-10, -20, -30])).toBe(-60);
+});
 
 // Given an array with decimal/float numbers
 // When passed to the sum function
 // Then it should return the correct total sum
+test("given an array with decimal numbers, returns the correct total sum", () => {
+  expect(sum([1.5, 2.5, 3.5])).toBe(7.5);
+});
 
 // Given an array containing non-number values
 // When passed to the sum function
 // Then it should ignore the non-numerical values and return the sum of the numerical elements
-
+test("ignores non-numeric values", () => {
+  expect(sum([10, "a", true, 50, null, 40])).toBe(100);
+});
 // Given an array with only non-number values
 // When passed to the sum function
 // Then it should return the least surprising value given how it behaves for all other inputs
+test("given an array with only non-number values, returns 0", () => {
+  expect(sum(["a", "b", null, true])).toBe(0);
+});
diff --git a/Sprint-1/package-lock.json b/Sprint-1/package-lock.json
index 83e427d0b..4c8215933 100644
--- a/Sprint-1/package-lock.json
+++ b/Sprint-1/package-lock.json
@@ -27,14 +27,15 @@
       }
     },
     "node_modules/@babel/code-frame": {
-      "version": "7.25.7",
-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.25.7.tgz",
-      "integrity": "sha512-0xZJFNE5XMpENsgfHYTw8FbX4kv53mFLn2i3XPoq69LyhYSCBJtitaHx9QnsVTrsogI4Z3+HtEfZ2/GFPOtf5g==",
+      "version": "7.27.1",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.27.1.tgz",
+      "integrity": "sha512-cjQ7ZlQ0Mv3b47hABuTevyTuYN4i+loJKGeV9flcCgIK37cCXRh+L1bd3iBHlynerhQ7BhCkn2BPbQUL+rGqFg==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@babel/highlight": "^7.25.7",
-        "picocolors": "^1.0.0"
+        "@babel/helper-validator-identifier": "^7.27.1",
+        "js-tokens": "^4.0.0",
+        "picocolors": "^1.1.1"
       },
       "engines": {
         "node": ">=6.9.0"
@@ -172,9 +173,9 @@
       }
     },
     "node_modules/@babel/helper-string-parser": {
-      "version": "7.25.7",
-      "resolved": "https://registry.npmjs.org/@babel/helper-string-parser/-/helper-string-parser-7.25.7.tgz",
-      "integrity": "sha512-CbkjYdsJNHFk8uqpEkpCvRs3YRp9tY6FmFY7wLMSYuGYkrdUi7r2lc4/wqsvlHoMznX3WJ9IP8giGPq68T/Y6g==",
+      "version": "7.27.1",
+      "resolved": "https://registry.npmjs.org/@babel/helper-string-parser/-/helper-string-parser-7.27.1.tgz",
+      "integrity": "sha512-qMlSxKbpRlAridDExk92nSobyDdpPijUq2DW6oDnUqd0iOGxmQjyqhMIihI9+zv4LPyZdRje2cavWPbCbWm3eA==",
       "dev": true,
       "license": "MIT",
       "engines": {
@@ -182,9 +183,9 @@
       }
     },
     "node_modules/@babel/helper-validator-identifier": {
-      "version": "7.25.7",
-      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.25.7.tgz",
-      "integrity": "sha512-AM6TzwYqGChO45oiuPqwL2t20/HdMC1rTPAesnBCgPCSF1x3oN9MVUwQV2iyz4xqWrctwK5RNC8LV22kaQCNYg==",
+      "version": "7.27.1",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.27.1.tgz",
+      "integrity": "sha512-D2hP9eA+Sqx1kBZgzxZh0y1trbuU+JoDkiEwqhQ36nodYqJwyEIhPSdMNd7lOm/4io72luTPWH20Yda0xOuUow==",
       "dev": true,
       "license": "MIT",
       "engines": {
@@ -202,121 +203,27 @@
       }
     },
     "node_modules/@babel/helpers": {
-      "version": "7.25.7",
-      "resolved": "https://registry.npmjs.org/@babel/helpers/-/helpers-7.25.7.tgz",
-      "integrity": "sha512-Sv6pASx7Esm38KQpF/U/OXLwPPrdGHNKoeblRxgZRLXnAtnkEe4ptJPDtAZM7fBLadbc1Q07kQpSiGQ0Jg6tRA==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@babel/template": "^7.25.7",
-        "@babel/types": "^7.25.7"
-      },
-      "engines": {
-        "node": ">=6.9.0"
-      }
-    },
-    "node_modules/@babel/highlight": {
-      "version": "7.25.7",
-      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.25.7.tgz",
-      "integrity": "sha512-iYyACpW3iW8Fw+ZybQK+drQre+ns/tKpXbNESfrhNnPLIklLbXr7MYJ6gPEd0iETGLOK+SxMjVvKb/ffmk+FEw==",
+      "version": "7.28.2",
+      "resolved": "https://registry.npmjs.org/@babel/helpers/-/helpers-7.28.2.tgz",
+      "integrity": "sha512-/V9771t+EgXz62aCcyofnQhGM8DQACbRhvzKFsXKC9QM+5MadF8ZmIm0crDMaz3+o0h0zXfJnd4EhbYbxsrcFw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@babel/helper-validator-identifier": "^7.25.7",
-        "chalk": "^2.4.2",
-        "js-tokens": "^4.0.0",
-        "picocolors": "^1.0.0"
+        "@babel/template": "^7.27.2",
+        "@babel/types": "^7.28.2"
       },
       "engines": {
         "node": ">=6.9.0"
       }
     },
-    "node_modules/@babel/highlight/node_modules/ansi-styles": {
-      "version": "3.2.1",
-      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
-      "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "color-convert": "^1.9.0"
-      },
-      "engines": {
-        "node": ">=4"
-      }
-    },
-    "node_modules/@babel/highlight/node_modules/chalk": {
-      "version": "2.4.2",
-      "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
-      "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "ansi-styles": "^3.2.1",
-        "escape-string-regexp": "^1.0.5",
-        "supports-color": "^5.3.0"
-      },
-      "engines": {
-        "node": ">=4"
-      }
-    },
-    "node_modules/@babel/highlight/node_modules/color-convert": {
-      "version": "1.9.3",
-      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.3.tgz",
-      "integrity": "sha512-QfAUtd+vFdAtFQcC8CCyYt1fYWxSqAiK2cSD6zDB8N3cpsEBAvRxp9zOGg6G/SHHJYAT88/az/IuDGALsNVbGg==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "color-name": "1.1.3"
-      }
-    },
-    "node_modules/@babel/highlight/node_modules/color-name": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
-      "integrity": "sha512-72fSenhMw2HZMTVHeCA9KCmpEIbzWiQsjN+BHcBbS9vr1mtt+vJjPdksIBNUmKAW8TFUDPJK5SUU3QhE9NEXDw==",
-      "dev": true,
-      "license": "MIT"
-    },
-    "node_modules/@babel/highlight/node_modules/escape-string-regexp": {
-      "version": "1.0.5",
-      "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
-      "integrity": "sha512-vbRorB5FUQWvla16U8R/qgaFIya2qGzwDrNmCZuYKrbdSUMG6I1ZCGQRefkRVhuOkIGVne7BQ35DSfo1qvJqFg==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=0.8.0"
-      }
-    },
-    "node_modules/@babel/highlight/node_modules/has-flag": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
-      "integrity": "sha512-sKJf1+ceQBr4SMkvQnBDNDtf4TXpVhVGateu0t918bl30FnbE2m4vNLX+VWe/dpjlb+HugGYzW7uQXH98HPEYw==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=4"
-      }
-    },
-    "node_modules/@babel/highlight/node_modules/supports-color": {
-      "version": "5.5.0",
-      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
-      "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "has-flag": "^3.0.0"
-      },
-      "engines": {
-        "node": ">=4"
-      }
-    },
     "node_modules/@babel/parser": {
-      "version": "7.25.8",
-      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.25.8.tgz",
-      "integrity": "sha512-HcttkxzdPucv3nNFmfOOMfFf64KgdJVqm1KaCm25dPGMLElo9nsLvXeJECQg8UzPuBGLyTSA0ZzqCtDSzKTEoQ==",
+      "version": "7.28.0",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.28.0.tgz",
+      "integrity": "sha512-jVZGvOxOuNSsuQuLRTh13nU0AogFlw32w/MT+LV6D3sP5WdbW61E77RnkbaO2dUvmPAYrBDJXGn5gGS6tH4j8g==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@babel/types": "^7.25.8"
+        "@babel/types": "^7.28.0"
       },
       "bin": {
         "parser": "bin/babel-parser.js"
@@ -565,15 +472,15 @@
       }
     },
     "node_modules/@babel/template": {
-      "version": "7.25.7",
-      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.25.7.tgz",
-      "integrity": "sha512-wRwtAgI3bAS+JGU2upWNL9lSlDcRCqD05BZ1n3X2ONLH1WilFP6O1otQjeMK/1g0pvYcXC7b/qVUB1keofjtZA==",
+      "version": "7.27.2",
+      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.27.2.tgz",
+      "integrity": "sha512-LPDZ85aEJyYSd18/DkjNh4/y1ntkE5KwUHWTiqgRxruuZL2F1yuHligVHLvcHY2vMHXttKFpJn6LwfI7cw7ODw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@babel/code-frame": "^7.25.7",
-        "@babel/parser": "^7.25.7",
-        "@babel/types": "^7.25.7"
+        "@babel/code-frame": "^7.27.1",
+        "@babel/parser": "^7.27.2",
+        "@babel/types": "^7.27.1"
       },
       "engines": {
         "node": ">=6.9.0"
@@ -599,15 +506,14 @@
       }
     },
     "node_modules/@babel/types": {
-      "version": "7.25.8",
-      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.25.8.tgz",
-      "integrity": "sha512-JWtuCu8VQsMladxVz/P4HzHUGCAwpuqacmowgXFs5XjxIgKuNjnLokQzuVjlTvIzODaDmpjT3oxcC48vyk9EWg==",
+      "version": "7.28.2",
+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.28.2.tgz",
+      "integrity": "sha512-ruv7Ae4J5dUYULmeXw1gmb7rYRz57OWCPM57pHojnLq/3Z1CK2lNSLTCVjxVk1F/TZHwOZZrOWi0ur95BbLxNQ==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@babel/helper-string-parser": "^7.25.7",
-        "@babel/helper-validator-identifier": "^7.25.7",
-        "to-fast-properties": "^2.0.0"
+        "@babel/helper-string-parser": "^7.27.1",
+        "@babel/helper-validator-identifier": "^7.27.1"
       },
       "engines": {
         "node": ">=6.9.0"
@@ -1325,9 +1231,9 @@
       "license": "MIT"
     },
     "node_modules/brace-expansion": {
-      "version": "1.1.11",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
-      "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
+      "version": "1.1.12",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.12.tgz",
+      "integrity": "sha512-9T9UjW3r0UW5c1Q7GTwllptXwhvYmEzFhzMfZ9H7FQWt+uZePjZPjBP/W1ZEyZ1twGWom5/56TF4lPcqjnDHcg==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -1579,9 +1485,9 @@
       }
     },
     "node_modules/cross-spawn": {
-      "version": "7.0.3",
-      "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.3.tgz",
-      "integrity": "sha512-iRDPJKUPVEND7dHPO8rkbOnPpyDygcDFtWjpeWNCgy8WP2rXcxXL8TskReQl6OrB2G7+UJrags1q15Fudc7G6w==",
+      "version": "7.0.6",
+      "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.6.tgz",
+      "integrity": "sha512-uV2QOWP2nWzsy2aMp8aRibhi9dlzF5Hgh5SHaB9OiTGEyDTiJJyx0uy51QXdyWbtAHNua4XJzUKca3OzKUd3vA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -3153,9 +3059,9 @@
       "license": "MIT"
     },
     "node_modules/picocolors": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/picocolors/-/picocolors-1.1.0.tgz",
-      "integrity": "sha512-TQ92mBOW0l3LeMeyLV6mzy/kWr8lkd/hp3mTg7wYK7zJhuBStmGMBG0BdeDZS/dZx1IukaX6Bk11zcln25o1Aw==",
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/picocolors/-/picocolors-1.1.1.tgz",
+      "integrity": "sha512-xceH2snhtb5M9liqDsmEw56le376mTZkEX/jEb/RxNFyegNul7eNslCXP9FDj/Lcu0X8KEyMceP2ntpaHrDEVA==",
       "dev": true,
       "license": "ISC"
     },
@@ -3543,16 +3449,6 @@
       "dev": true,
       "license": "BSD-3-Clause"
     },
-    "node_modules/to-fast-properties": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz",
-      "integrity": "sha512-/OaKK0xYrs3DmxRYqL/yDc+FxFUVYhDlXMhRmv3z915w2HF1tnN1omB354j8VUGO/hbRzyD6Y3sA7v7GS/ceog==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=4"
-      }
-    },
     "node_modules/to-regex-range": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
diff --git a/Sprint-1/refactor/includes.js b/Sprint-1/refactor/includes.js
index 29dad81f0..fc9779d1c 100644
--- a/Sprint-1/refactor/includes.js
+++ b/Sprint-1/refactor/includes.js
@@ -1,12 +1,13 @@
 // Refactor the implementation of includes to use a for...of loop
 
+// This function checks if a value is in a list. It returns true if found, otherwise false.
 function includes(list, target) {
-  for (let index = 0; index < list.length; index++) {
-    const element = list[index];
+  for (const element of list) {
     if (element === target) {
       return true;
     }
   }
+
   return false;
 }
 
diff --git a/Sprint-2/debug/address.js b/Sprint-2/debug/address.js
index 940a6af83..bb950ca11 100644
--- a/Sprint-2/debug/address.js
+++ b/Sprint-2/debug/address.js
@@ -1,4 +1,5 @@
 // Predict and explain first...
+// The bellow code should be in array format.
 
 // This code should log out the houseNumber from the address object
 // but it isn't working...
@@ -12,4 +13,7 @@ const address = {
   postcode: "XYZ 123",
 };
 
-console.log(`My house number is ${address[0]}`);
+//console.log(`My house number is ${address[0]}`);
+
+// Here we use dot notation to access the houseNumber property
+console.log(`My house number is ${address.houseNumber}`);
diff --git a/Sprint-2/debug/author.js b/Sprint-2/debug/author.js
index 8c2125977..8b2d88115 100644
--- a/Sprint-2/debug/author.js
+++ b/Sprint-2/debug/author.js
@@ -1,4 +1,6 @@
 // Predict and explain first...
+// In this code, we are trying to iterate over the values of an object using " for ... of loop".
+// However, the `for ... of` loop is designed to iterate over iterable objects like arrays, not objects.
 
 // 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
@@ -11,6 +13,16 @@ const author = {
   alive: true,
 };
 
-for (const value of author) {
-  console.log(value);
+// for this code we use `for ... in` loop method whenever we want to loop though an object.
+// The `for ... in` loop iterates through properties in the prototype chain.
+// This means that we need to check if the property belongs to the object using hasownproperty whenever we loop through an object with the `for ... in` loop.
+
+for (const key in author) {
+  if (author.hasOwnProperty(key)) {
+    console.log(`${key}: ${author[key]}`);
+  }
 }
+
+//for (const value of author) {
+// console.log(value);
+//}
diff --git a/Sprint-2/debug/recipe.js b/Sprint-2/debug/recipe.js
index 6cbdd22cd..cd0ab04c2 100644
--- a/Sprint-2/debug/recipe.js
+++ b/Sprint-2/debug/recipe.js
@@ -1,4 +1,5 @@
 // Predict and explain first...
+// we should add new line `\n` between ingredients to log them 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
@@ -10,6 +11,13 @@ const recipe = {
   ingredients: ["olive oil", "tomatoes", "salt", "pepper"],
 };
 
-console.log(`${recipe.title} serves ${recipe.serves}
-  ingredients:
-${recipe}`);
+// Here we add `join("\n") to the ingredients array to log each ingredient in a new line.
+console.log(
+  `${recipe.title} serves ${
+    recipe.serves
+  } ingredients: ${recipe.ingredients.join("\n")}`
+);
+
+//console.log(`${recipe.title} serves ${recipe.serves}
+// ingredients:
+//${recipe}`);
diff --git a/Sprint-2/implement/contains.js b/Sprint-2/implement/contains.js
index cd779308a..5df5b2f13 100644
--- a/Sprint-2/implement/contains.js
+++ b/Sprint-2/implement/contains.js
@@ -1,3 +1,16 @@
-function contains() {}
+function contains(obj, prop) {
+  return obj.hasOwnProperty(prop);
+}
+
+// Or we can use `for ...in loop to check for the property
+// function contains(obj, prop) {
+//   for (const key in obj){
+//    if (key === prop) return true;
+//   }
+//   return false;
+// }
+
+console.log(contains({ a: 1, b: 2 }, "a")); // true
+console.log(contains({ a: 1, b: 2 }, "c")); // false
 
 module.exports = contains;
diff --git a/Sprint-2/implement/contains.test.js b/Sprint-2/implement/contains.test.js
index 326bdb1f2..ce048704a 100644
--- a/Sprint-2/implement/contains.test.js
+++ b/Sprint-2/implement/contains.test.js
@@ -20,16 +20,27 @@ as the object doesn't contains a key of 'c'
 // Given an empty object
 // When passed to contains
 // Then it should return false
-test.todo("contains on empty object returns false");
+test("contains on empty object returns false", () => {
+  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("contains on object with existing property returns true", () => {
+  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("contains on object with non-existent property returns false", () => {
+  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("contains on an array returns false", () => {
+  expect(contains([1, 2, 3], 4)).toBe(false);
+});
diff --git a/Sprint-2/implement/lookup.js b/Sprint-2/implement/lookup.js
index a6746e07f..c7b441d38 100644
--- a/Sprint-2/implement/lookup.js
+++ b/Sprint-2/implement/lookup.js
@@ -1,5 +1,16 @@
-function createLookup() {
-  // implementation here
+function createLookup(codePairs) {
+  const lookup = codePairs.reduce((acc, [key, value]) => {
+    acc[key] = value;
+    return acc;
+  }, {});
+  return lookup;
 }
 
+console.log(
+  createLookup([
+    ["US", "USD"],
+    ["CA", "CAD"],
+  ])
+);
+
 module.exports = createLookup;
diff --git a/Sprint-2/implement/lookup.test.js b/Sprint-2/implement/lookup.test.js
index 547e06c5a..be23e8f5b 100644
--- a/Sprint-2/implement/lookup.test.js
+++ b/Sprint-2/implement/lookup.test.js
@@ -1,6 +1,18 @@
 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"],
+  ];
+
+  const expectedOutput = {
+    US: "USD",
+    CA: "CAD",
+  };
+
+  expect(createLookup(input)).toEqual(expectedOutput);
+});
 
 /*
 
diff --git a/Sprint-2/implement/querystring.js b/Sprint-2/implement/querystring.js
index 45ec4e5f3..d08ceb724 100644
--- a/Sprint-2/implement/querystring.js
+++ b/Sprint-2/implement/querystring.js
@@ -6,7 +6,7 @@ function parseQueryString(queryString) {
   const keyValuePairs = queryString.split("&");
 
   for (const pair of keyValuePairs) {
-    const [key, value] = pair.split("=");
+    const [key, value] = pair.split(/=(.+)/); // We use regex to split only at first.
     queryParams[key] = value;
   }
 
diff --git a/Sprint-2/implement/querystring.test.js b/Sprint-2/implement/querystring.test.js
index 3e218b789..3aed004c5 100644
--- a/Sprint-2/implement/querystring.test.js
+++ b/Sprint-2/implement/querystring.test.js
@@ -3,10 +3,21 @@
 // Below is one test case for an edge case the implementation doesn't handle well.
 // Fix the implementation for this test, and try to think of as many other edge cases as possible - write tests and fix those too.
 
-const parseQueryString = require("./querystring.js")
+const parseQueryString = require("./querystring.js");
 
 test("parses querystring values containing =", () => {
-  expect(parseQueryString("equation=x=y+1")).toEqual({
-    "equation": "x=y+1",
+  expect(parseQueryString("equation=x=y+1")).toStrictEqual({
+    equation: "x=y+1",
+  });
+});
+
+test("returns empty object for empty query string", () => {
+  expect(parseQueryString("")).toStrictEqual({});
+});
+
+test("parses multiple parameters", () => {
+  expect(parseQueryString("name=John&age=30")).toStrictEqual({
+    name: "John",
+    age: "30",
   });
 });
diff --git a/Sprint-2/implement/tally.js b/Sprint-2/implement/tally.js
index f47321812..7693700c4 100644
--- a/Sprint-2/implement/tally.js
+++ b/Sprint-2/implement/tally.js
@@ -1,3 +1,19 @@
-function tally() {}
+function tally(array) {
+  if (!Array.isArray(array)) {
+    throw new Error("Input must be an array");
+    // check if the input ia an array. if not, throw an error.
+  }
+  const tally = {};
+
+  for (const item of array) {
+    tally[item] = (tally[item] || 0) + 1;
+    // If the item already exists in tally, increase its count by 1.
+    // If it doesn't exist, start from 1.
+  }
+
+  return tally;
+}
+
+console.log(tally(["a", "a", "a"]));
 
 module.exports = tally;
diff --git a/Sprint-2/implement/tally.test.js b/Sprint-2/implement/tally.test.js
index 2ceffa8dd..da5d6df21 100644
--- a/Sprint-2/implement/tally.test.js
+++ b/Sprint-2/implement/tally.test.js
@@ -19,16 +19,27 @@ const tally = require("./tally.js");
 // Given a function called tally
 // When passed an array of items
 // Then it should return an object containing the count for each unique item
+test("tally on a single item returns count of 1", () => {
+  expect(tally(["a"])).toEqual({ a: 1 });
+});
 
 // 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
 // Then it should return counts for each unique item
+test("tally on an array with duplicates returns correct counts", () => {
+  expect(tally(["a", "a", "b", "c"])).toEqual({ a: 2, b: 1, c: 1 });
+});
 
 // Given an invalid input like a string
 // When passed to tally
 // Then it should throw an error
+test("tally on a string throws an error", () => {
+  expect(() => tally("a")).toThrow("Input must be an array");
+});
diff --git a/Sprint-2/interpret/invert.js b/Sprint-2/interpret/invert.js
index bb353fb1f..5c4c36bde 100644
--- a/Sprint-2/interpret/invert.js
+++ b/Sprint-2/interpret/invert.js
@@ -10,20 +10,29 @@ function invert(obj) {
   const invertedObj = {};
 
   for (const [key, value] of Object.entries(obj)) {
-    invertedObj.key = value;
+    invertedObj[value] = key;
   }
 
   return invertedObj;
 }
+console.log(invert({ a: 1 })); // {1: "a"}
+console.log(invert({ a: 1, b: 2 })); // {1: "a", 2: "b"}
+module.exports = invert;
 
 // a) What is the current return value when invert is called with { a : 1 }
+// The current return value is {1: "a"}
 
 // b) What is the current return value when invert is called with { a: 1, b: 2 }
+// The current return value is {1: "a", 2: "b"}
 
 // c) What is the target return value when invert is called with {a : 1, b: 2}
+// The target return value is {1: "a", 2: "b"}
 
 // c) What does Object.entries return? Why is it needed in this program?
+// Object.entries takes an object and return an array of key-value pairs.
+// it needed because it converts the object into an array of [key, value] pairs which makes it easy to loop over both key and value at the same time.
 
 // d) Explain why the current return value is different from the target output
+// because it returns the [key, value] of an object in reverse order [value,key]
 
 // e) Fix the implementation of invert (and write tests to prove it's fixed!)
diff --git a/Sprint-2/interpret/invert.test.js b/Sprint-2/interpret/invert.test.js
new file mode 100644
index 000000000..005c6c894
--- /dev/null
+++ b/Sprint-2/interpret/invert.test.js
@@ -0,0 +1,16 @@
+const invert = require("./invert.js");
+
+test("inverts an object with unique keys", () => {
+  expect(invert({ a: 1, b: 2 })).toStrictEqual({ 1: "a", 2: "b" });
+});
+
+test("inverts an object with string keys", () => {
+  expect(invert({ cat: "meow", dog: "bark" })).toStrictEqual({
+    meow: "cat",
+    bark: "dog",
+  });
+});
+
+test("inverts an empty object", () => {
+  expect(invert({})).toEqual({});
+});
diff --git a/Sprint-2/package-lock.json b/Sprint-2/package-lock.json
index 9b4c725d6..f1b1033b8 100644
--- a/Sprint-2/package-lock.json
+++ b/Sprint-2/package-lock.json
@@ -27,14 +27,15 @@
       }
     },
     "node_modules/@babel/code-frame": {
-      "version": "7.25.7",
-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.25.7.tgz",
-      "integrity": "sha512-0xZJFNE5XMpENsgfHYTw8FbX4kv53mFLn2i3XPoq69LyhYSCBJtitaHx9QnsVTrsogI4Z3+HtEfZ2/GFPOtf5g==",
+      "version": "7.27.1",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.27.1.tgz",
+      "integrity": "sha512-cjQ7ZlQ0Mv3b47hABuTevyTuYN4i+loJKGeV9flcCgIK37cCXRh+L1bd3iBHlynerhQ7BhCkn2BPbQUL+rGqFg==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@babel/highlight": "^7.25.7",
-        "picocolors": "^1.0.0"
+        "@babel/helper-validator-identifier": "^7.27.1",
+        "js-tokens": "^4.0.0",
+        "picocolors": "^1.1.1"
       },
       "engines": {
         "node": ">=6.9.0"
@@ -172,9 +173,9 @@
       }
     },
     "node_modules/@babel/helper-string-parser": {
-      "version": "7.25.7",
-      "resolved": "https://registry.npmjs.org/@babel/helper-string-parser/-/helper-string-parser-7.25.7.tgz",
-      "integrity": "sha512-CbkjYdsJNHFk8uqpEkpCvRs3YRp9tY6FmFY7wLMSYuGYkrdUi7r2lc4/wqsvlHoMznX3WJ9IP8giGPq68T/Y6g==",
+      "version": "7.27.1",
+      "resolved": "https://registry.npmjs.org/@babel/helper-string-parser/-/helper-string-parser-7.27.1.tgz",
+      "integrity": "sha512-qMlSxKbpRlAridDExk92nSobyDdpPijUq2DW6oDnUqd0iOGxmQjyqhMIihI9+zv4LPyZdRje2cavWPbCbWm3eA==",
       "dev": true,
       "license": "MIT",
       "engines": {
@@ -182,9 +183,9 @@
       }
     },
     "node_modules/@babel/helper-validator-identifier": {
-      "version": "7.25.7",
-      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.25.7.tgz",
-      "integrity": "sha512-AM6TzwYqGChO45oiuPqwL2t20/HdMC1rTPAesnBCgPCSF1x3oN9MVUwQV2iyz4xqWrctwK5RNC8LV22kaQCNYg==",
+      "version": "7.27.1",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.27.1.tgz",
+      "integrity": "sha512-D2hP9eA+Sqx1kBZgzxZh0y1trbuU+JoDkiEwqhQ36nodYqJwyEIhPSdMNd7lOm/4io72luTPWH20Yda0xOuUow==",
       "dev": true,
       "license": "MIT",
       "engines": {
@@ -202,121 +203,27 @@
       }
     },
     "node_modules/@babel/helpers": {
-      "version": "7.25.7",
-      "resolved": "https://registry.npmjs.org/@babel/helpers/-/helpers-7.25.7.tgz",
-      "integrity": "sha512-Sv6pASx7Esm38KQpF/U/OXLwPPrdGHNKoeblRxgZRLXnAtnkEe4ptJPDtAZM7fBLadbc1Q07kQpSiGQ0Jg6tRA==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@babel/template": "^7.25.7",
-        "@babel/types": "^7.25.7"
-      },
-      "engines": {
-        "node": ">=6.9.0"
-      }
-    },
-    "node_modules/@babel/highlight": {
-      "version": "7.25.7",
-      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.25.7.tgz",
-      "integrity": "sha512-iYyACpW3iW8Fw+ZybQK+drQre+ns/tKpXbNESfrhNnPLIklLbXr7MYJ6gPEd0iETGLOK+SxMjVvKb/ffmk+FEw==",
+      "version": "7.28.2",
+      "resolved": "https://registry.npmjs.org/@babel/helpers/-/helpers-7.28.2.tgz",
+      "integrity": "sha512-/V9771t+EgXz62aCcyofnQhGM8DQACbRhvzKFsXKC9QM+5MadF8ZmIm0crDMaz3+o0h0zXfJnd4EhbYbxsrcFw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@babel/helper-validator-identifier": "^7.25.7",
-        "chalk": "^2.4.2",
-        "js-tokens": "^4.0.0",
-        "picocolors": "^1.0.0"
+        "@babel/template": "^7.27.2",
+        "@babel/types": "^7.28.2"
       },
       "engines": {
         "node": ">=6.9.0"
       }
     },
-    "node_modules/@babel/highlight/node_modules/ansi-styles": {
-      "version": "3.2.1",
-      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
-      "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "color-convert": "^1.9.0"
-      },
-      "engines": {
-        "node": ">=4"
-      }
-    },
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-      "version": "2.4.2",
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-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "ansi-styles": "^3.2.1",
-        "escape-string-regexp": "^1.0.5",
-        "supports-color": "^5.3.0"
-      },
-      "engines": {
-        "node": ">=4"
-      }
-    },
-    "node_modules/@babel/highlight/node_modules/color-convert": {
-      "version": "1.9.3",
-      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.3.tgz",
-      "integrity": "sha512-QfAUtd+vFdAtFQcC8CCyYt1fYWxSqAiK2cSD6zDB8N3cpsEBAvRxp9zOGg6G/SHHJYAT88/az/IuDGALsNVbGg==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "color-name": "1.1.3"
-      }
-    },
-    "node_modules/@babel/highlight/node_modules/color-name": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
-      "integrity": "sha512-72fSenhMw2HZMTVHeCA9KCmpEIbzWiQsjN+BHcBbS9vr1mtt+vJjPdksIBNUmKAW8TFUDPJK5SUU3QhE9NEXDw==",
-      "dev": true,
-      "license": "MIT"
-    },
-    "node_modules/@babel/highlight/node_modules/escape-string-regexp": {
-      "version": "1.0.5",
-      "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
-      "integrity": "sha512-vbRorB5FUQWvla16U8R/qgaFIya2qGzwDrNmCZuYKrbdSUMG6I1ZCGQRefkRVhuOkIGVne7BQ35DSfo1qvJqFg==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=0.8.0"
-      }
-    },
-    "node_modules/@babel/highlight/node_modules/has-flag": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
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-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=4"
-      }
-    },
-    "node_modules/@babel/highlight/node_modules/supports-color": {
-      "version": "5.5.0",
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-      "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "has-flag": "^3.0.0"
-      },
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