From f202df5f37f2a5b8d8b223de8b1cc73918567f64 Mon Sep 17 00:00:00 2001
From: joanne342 <130585013+joanne342@users.noreply.github.com>
Date: Sat, 4 Jul 2026 13:57:37 +0100
Subject: [PATCH 01/18] Update median.js

---
 Sprint-1/fix/median.js | 36 ++++++++++++++++++++++++++++++++----
 1 file changed, 32 insertions(+), 4 deletions(-)

diff --git a/Sprint-1/fix/median.js b/Sprint-1/fix/median.js
index b22590bc6..69d5d1bc8 100644
--- a/Sprint-1/fix/median.js
+++ b/Sprint-1/fix/median.js
@@ -5,10 +5,38 @@
 // Hint: Please consider scenarios when 'list' doesn't have numbers (the function is expected to return null)
 // 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;
+function calculateMedian(arr) {
+  try {
+    if (!Array.isArray(arr)) return null;
+
+    const nums = [];
+
+    for (const x of arr) {
+      // skip null/undefined
+      if (x === null || x === undefined) continue;
+
+      if (typeof x === "string" && x.trim() === "") continue;
+
+      const n = Number(x);
+
+      if (Number.isFinite(n)) {
+        nums.push(n);
+      }
+    }
+
+    if (nums.length === 0) return null;
+
+    const sorted = [...nums].sort((a, b) => a - b);
+    const mid = Math.floor(sorted.length / 2);
+
+    if (sorted.length % 2 === 1) {
+      return sorted[mid];
+    } else {
+      return (sorted[mid - 1] + sorted[mid]) / 2;
+    }
+  } catch (e) {
+    return null;
+  }
 }
 
 module.exports = calculateMedian;

From 92d73301266aba42602a772a1b00335cc9e66ddc Mon Sep 17 00:00:00 2001
From: joanne342 <130585013+joanne342@users.noreply.github.com>
Date: Sat, 4 Jul 2026 14:33:48 +0100
Subject: [PATCH 02/18] Update median.js

---
 Sprint-1/fix/median.js | 37 +++++++++++++++++--------------------
 1 file changed, 17 insertions(+), 20 deletions(-)

diff --git a/Sprint-1/fix/median.js b/Sprint-1/fix/median.js
index 69d5d1bc8..d3e0b406d 100644
--- a/Sprint-1/fix/median.js
+++ b/Sprint-1/fix/median.js
@@ -1,10 +1,3 @@
-// Fix this implementation
-// Start by running the tests for this function
-// If you're in the Sprint-1 directory, you can run `npm test -- fix` to run the tests in the fix directory
-
-// Hint: Please consider scenarios when 'list' doesn't have numbers (the function is expected to return null)
-// or 'list' has mixed values (the function is expected to sort only numbers).
-
 function calculateMedian(arr) {
   try {
     if (!Array.isArray(arr)) return null;
@@ -12,29 +5,33 @@ function calculateMedian(arr) {
     const nums = [];
 
     for (const x of arr) {
-      // skip null/undefined
-      if (x === null || x === undefined) continue;
-
-      if (typeof x === "string" && x.trim() === "") continue;
+      if (typeof x === "number" && Number.isFinite(x)) {
+        nums.push(x);
+        continue;
+      }
 
-      const n = Number(x);
+      if (typeof x === "string") {
+        const trimmed = x.trim();
+        if (trimmed === "") continue;
 
-      if (Number.isFinite(n)) {
-        nums.push(n);
+        const n = Number(trimmed);
+        if (Number.isFinite(n)) {
+          nums.push(n);
+        }
       }
     }
 
     if (nums.length === 0) return null;
 
     const sorted = [...nums].sort((a, b) => a - b);
+
     const mid = Math.floor(sorted.length / 2);
 
-    if (sorted.length % 2 === 1) {
-      return sorted[mid];
-    } else {
-      return (sorted[mid - 1] + sorted[mid]) / 2;
-    }
-  } catch (e) {
+    return sorted.length % 2 === 1
+      ? sorted[mid]
+      : (sorted[mid - 1] + sorted[mid]) / 2;
+
+  } catch {
     return null;
   }
 }

From a5229bb2c7fd602c383630f2e8e88167f2d3f66c Mon Sep 17 00:00:00 2001
From: joanne342 <130585013+joanne342@users.noreply.github.com>
Date: Sat, 4 Jul 2026 14:38:00 +0100
Subject: [PATCH 03/18] Update median.js

---
 Sprint-1/fix/median.js | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/Sprint-1/fix/median.js b/Sprint-1/fix/median.js
index d3e0b406d..fcfc7f25f 100644
--- a/Sprint-1/fix/median.js
+++ b/Sprint-1/fix/median.js
@@ -11,20 +11,14 @@ function calculateMedian(arr) {
       }
 
       if (typeof x === "string") {
-        const trimmed = x.trim();
-        if (trimmed === "") continue;
-
-        const n = Number(trimmed);
-        if (Number.isFinite(n)) {
-          nums.push(n);
-        }
+        const n = Number(x.trim());
+        if (Number.isFinite(n)) nums.push(n);
       }
     }
 
     if (nums.length === 0) return null;
 
-    const sorted = [...nums].sort((a, b) => a - b);
-
+    const sorted = nums.slice().sort((a, b) => a - b);
     const mid = Math.floor(sorted.length / 2);
 
     return sorted.length % 2 === 1

From 914cc03826f30fe881c5ccb5398117ed086224cc Mon Sep 17 00:00:00 2001
From: joanne342 <130585013+joanne342@users.noreply.github.com>
Date: Sat, 4 Jul 2026 14:42:34 +0100
Subject: [PATCH 04/18] Update median.js

---
 Sprint-1/fix/median.js | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/Sprint-1/fix/median.js b/Sprint-1/fix/median.js
index fcfc7f25f..9648ebfa8 100644
--- a/Sprint-1/fix/median.js
+++ b/Sprint-1/fix/median.js
@@ -4,14 +4,15 @@ function calculateMedian(arr) {
 
     const nums = [];
 
-    for (const x of arr) {
+    for (let i = 0; i < arr.length; i++) {
+      const x = arr[i];
+
+      if (!(i in arr)) continue;
+
       if (typeof x === "number" && Number.isFinite(x)) {
         nums.push(x);
-        continue;
-      }
-
-      if (typeof x === "string") {
-        const n = Number(x.trim());
+      } else if (typeof x === "string") {
+        const n = Number(x);
         if (Number.isFinite(n)) nums.push(n);
       }
     }

From 49dbd75697a18950d161b63d26a246d31a45e53d Mon Sep 17 00:00:00 2001
From: joanne342 <130585013+joanne342@users.noreply.github.com>
Date: Sat, 4 Jul 2026 15:28:34 +0100
Subject: [PATCH 05/18] Update median.js

---
 Sprint-1/fix/median.js | 37 ++++++++++++-------------------------
 1 file changed, 12 insertions(+), 25 deletions(-)

diff --git a/Sprint-1/fix/median.js b/Sprint-1/fix/median.js
index 9648ebfa8..8361a9d3e 100644
--- a/Sprint-1/fix/median.js
+++ b/Sprint-1/fix/median.js
@@ -1,34 +1,21 @@
-function calculateMedian(arr) {
-  try {
-    if (!Array.isArray(arr)) return null;
+function calculate_median(arr) {
+  
+  if (!Array.isArray(arr)) return null;
 
-    const nums = [];
+  if (arr.length === 0) return null;
 
-    for (let i = 0; i < arr.length; i++) {
-      const x = arr[i];
+  const cleaned = arr.filter(x => typeof x === "number" && Number.isFinite(x));
 
-      if (!(i in arr)) continue;
+  if (cleaned.length === 0) return null;
 
-      if (typeof x === "number" && Number.isFinite(x)) {
-        nums.push(x);
-      } else if (typeof x === "string") {
-        const n = Number(x);
-        if (Number.isFinite(n)) nums.push(n);
-      }
-    }
+  const sorted = [...cleaned].sort((a, b) => a - b);
 
-    if (nums.length === 0) return null;
+  const mid = Math.floor(sorted.length / 2);
 
-    const sorted = nums.slice().sort((a, b) => a - b);
-    const mid = Math.floor(sorted.length / 2);
-
-    return sorted.length % 2 === 1
-      ? sorted[mid]
-      : (sorted[mid - 1] + sorted[mid]) / 2;
-
-  } catch {
-    return null;
+  if (sorted.length % 2 === 1) {
+    return sorted[mid];
+  } else {
+    return (sorted[mid - 1] + sorted[mid]) / 2;
   }
 }
-
 module.exports = calculateMedian;

From d2d77534f4ccaa6250a17e5adfa17ce5190b4f32 Mon Sep 17 00:00:00 2001
From: joanne342 <130585013+joanne342@users.noreply.github.com>
Date: Sat, 4 Jul 2026 15:55:34 +0100
Subject: [PATCH 06/18] Update median.js

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

diff --git a/Sprint-1/fix/median.js b/Sprint-1/fix/median.js
index 8361a9d3e..1b6edac4e 100644
--- a/Sprint-1/fix/median.js
+++ b/Sprint-1/fix/median.js
@@ -1,4 +1,4 @@
-function calculate_median(arr) {
+function calculateMedian(arr) {
   
   if (!Array.isArray(arr)) return null;
 

From 0d75782b8e1ba4c91c8e3cf5219b2d22bfdc674b Mon Sep 17 00:00:00 2001
From: joanne342 <130585013+joanne342@users.noreply.github.com>
Date: Sat, 4 Jul 2026 16:04:50 +0100
Subject: [PATCH 07/18] Update dedupe.test.js

---
 Sprint-1/implement/dedupe.test.js | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/Sprint-1/implement/dedupe.test.js b/Sprint-1/implement/dedupe.test.js
index d7c8e3d8e..b14bb8115 100644
--- a/Sprint-1/implement/dedupe.test.js
+++ b/Sprint-1/implement/dedupe.test.js
@@ -26,3 +26,18 @@ test.todo("given an empty array, it returns an empty array");
 // When passed to the dedupe function
 // Then it should return a new array with duplicates removed while preserving the 
 // first occurrence of each element from the original array.
+
+test("given an empty array, it returns an empty array", () => {
+  expect(dedupe([])).toEqual([]);
+});
+
+test("given an array with no duplicates, it returns a copy", () => {
+  const input = [1, 2, 3];
+  expect(dedupe(input)).toEqual([1, 2, 3]);
+  expect(dedupe(input)).not.toBe(input); // ensures it's a new array
+});
+
+test("removes duplicates while preserving order", () => {
+  expect(dedupe([5, 1, 1, 2, 3, 2, 5, 8])).toEqual([5, 1, 2, 3, 8]);
+  expect(dedupe(["a", "a", "b", "c", "b"])).toEqual(["a", "b", "c"]);
+});

From e45e7e1a946f3dd9d032dcd778749a268bde30cb Mon Sep 17 00:00:00 2001
From: joanne342 <130585013+joanne342@users.noreply.github.com>
Date: Sat, 4 Jul 2026 16:22:41 +0100
Subject: [PATCH 08/18] Update dedupe.js

---
 Sprint-1/implement/dedupe.js | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/Sprint-1/implement/dedupe.js b/Sprint-1/implement/dedupe.js
index 781e8718a..116d814a9 100644
--- a/Sprint-1/implement/dedupe.js
+++ b/Sprint-1/implement/dedupe.js
@@ -1 +1,9 @@
-function dedupe() {}
+function dedupe(arr) {
+  const array = [];
+  for (const x of arr) {
+    if (!array.includes(x)) {
+      array.push(x);
+    }
+  }
+  return array;
+}

From 373358225d70266993c8f94037584db8a635c136 Mon Sep 17 00:00:00 2001
From: joanne342 <130585013+joanne342@users.noreply.github.com>
Date: Wed, 8 Jul 2026 14:26:29 +0100
Subject: [PATCH 09/18] Update max.test.js

---
 Sprint-1/implement/max.test.js | 35 ++++++++++++++++++++--------------
 1 file changed, 21 insertions(+), 14 deletions(-)

diff --git a/Sprint-1/implement/max.test.js b/Sprint-1/implement/max.test.js
index 82f18fd88..e7dfc5f32 100644
--- a/Sprint-1/implement/max.test.js
+++ b/Sprint-1/implement/max.test.js
@@ -1,43 +1,50 @@
-/* Find the maximum element of an array of numbers
-
-In this kata, you will need to implement a function that find the largest numerical element of an array.
-
-E.g. max([30, 50, 10, 40]), target output: 50
-E.g. max(['hey', 10, 'hi', 60, 10]), target output: 60 (sum ignores any non-numerical elements)
-
-You should implement this function in max.js, and add tests for it in this file.
-
-We have set things up already so that this file can see your function from the other file.
-*/
-
 const findMax = require("./max.js");
 
 // Given an empty array
 // 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);
+});
 
 // Given an array with one number
 // When passed to the max function
 // Then it should return that number
+test("given an array with one number, returns that number", () => {
+  expect(findMax([42])).toBe(42);
+});
 
 // Given an array with both positive and negative numbers
 // When passed to the max function
 // Then it should return the largest number overall
+test("given an array with positive and negative numbers, returns the largest number", () => {
+  expect(findMax([-10, 5, -3, 20, 8])).toBe(20);
+});
 
 // Given an array with just negative numbers
 // When passed to the max function
 // Then it should return the closest one to zero
+test("given an array with only negative numbers, returns the closest to zero", () => {
+  expect(findMax([-8, -3, -15, -1])).toBe(-1);
+});
 
 // Given an array with decimal numbers
 // When passed to the max function
 // Then it should return the largest decimal number
+test("given an array with decimal numbers, returns the largest decimal", () => {
+  expect(findMax([1.5, 3.14, 2.72, 3.13])).toBe(3.14);
+});
 
 // Given an array with non-number values
 // When passed to the max function
 // Then it should return the max and ignore non-numeric values
+test("given an array with non-number values, ignores them and returns the maximum number", () => {
+  expect(findMax(["hey", 10, "hi", 60, 10])).toBe(60);
+});
 
 // Given an array with only non-number values
 // When passed to the max 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 -Infinity", () => {
+  expect(findMax(["hello", "world", true, null, {}])).toBe(-Infinity);
+});

From 14896e8eb23d0498372f6e87bae8d7c0e1e2d32b Mon Sep 17 00:00:00 2001
From: joanne342 <130585013+joanne342@users.noreply.github.com>
Date: Wed, 8 Jul 2026 14:42:21 +0100
Subject: [PATCH 10/18] Update max.js

---
 Sprint-1/implement/max.js | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Sprint-1/implement/max.js b/Sprint-1/implement/max.js
index 6dd76378e..e932dc598 100644
--- a/Sprint-1/implement/max.js
+++ b/Sprint-1/implement/max.js
@@ -1,4 +1,18 @@
 function findMax(elements) {
+  const floats = elements
+    .filter(x => {
+      const str = String(x).replace("-", "").replace(".", "");
+      return !isNaN(str) && str !== "";
+    })
+    .map(x => Number(x));
+
+  if (floats.length === 0) {
+    return -Infinity;
+  } else {
+    return Math.max(...floats);
+  }
+}
+  
 }
 
 module.exports = findMax;

From 8a28579a74331ec8d2f5109b2779a11b752226ed Mon Sep 17 00:00:00 2001
From: joanne342 <130585013+joanne342@users.noreply.github.com>
Date: Wed, 8 Jul 2026 14:55:42 +0100
Subject: [PATCH 11/18] Update max.js

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

diff --git a/Sprint-1/implement/max.js b/Sprint-1/implement/max.js
index e932dc598..d9d84fea3 100644
--- a/Sprint-1/implement/max.js
+++ b/Sprint-1/implement/max.js
@@ -13,6 +13,6 @@ function findMax(elements) {
   }
 }
   
-}
+
 
 module.exports = findMax;

From 93c86d2306298c087ce73c21f22c1e5f07b2fad2 Mon Sep 17 00:00:00 2001
From: joanne342 <130585013+joanne342@users.noreply.github.com>
Date: Wed, 8 Jul 2026 15:06:56 +0100
Subject: [PATCH 12/18] Update sum.test.js

---
 Sprint-1/implement/sum.test.js | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/Sprint-1/implement/sum.test.js b/Sprint-1/implement/sum.test.js
index dd0a090ca..2ecb1788f 100644
--- a/Sprint-1/implement/sum.test.js
+++ b/Sprint-1/implement/sum.test.js
@@ -13,24 +13,41 @@ 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);
+});
 
 // Given an array with just one number
 // When passed to the sum function
 // Then it should return that number
+test("given an array with one number, returns that number", () => {
+  expect(sum([10])).toBe(10);
+});
 
 // 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 containing negative numbers, returns the correct total", () => {
+  expect(sum([-10, -20, 30])).toBe(0);
+});
 
 // 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", () => {
+  expect(sum([10.5, 20.25, 5.25])).toBe(36);
+});
 
 // 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("given an array containing non-number values, ignores them and sums numbers only", () => {
+  expect(sum(["hey", 10, "hi", 60, 10])).toBe(80);
+});
 
 // 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(["hello", "world", true, null])).toBe(0);
+});

From ab33f70fc89522f4b279295eaeb2ce080aa5d13a Mon Sep 17 00:00:00 2001
From: joanne342 <130585013+joanne342@users.noreply.github.com>
Date: Wed, 8 Jul 2026 15:23:22 +0100
Subject: [PATCH 13/18] Update sum.js

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

diff --git a/Sprint-1/implement/sum.js b/Sprint-1/implement/sum.js
index 9062aafe3..ea225927d 100644
--- a/Sprint-1/implement/sum.js
+++ b/Sprint-1/implement/sum.js
@@ -1,4 +1,9 @@
 function sum(elements) {
+
+  return elements
+  .filter(x => String(x).replace("-", "").replace(".", "").match(/^\d+$/))
+  .reduce((sum, x) => sum + x, 0);
+  
 }
 
 module.exports = sum;

From ac761f89f0baf52e5a60b928077f460bf5dfea6f Mon Sep 17 00:00:00 2001
From: joanne342 <130585013+joanne342@users.noreply.github.com>
Date: Wed, 8 Jul 2026 15:42:23 +0100
Subject: [PATCH 14/18] Update includes.js

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

diff --git a/Sprint-1/refactor/includes.js b/Sprint-1/refactor/includes.js
index 29dad81f0..f727d5cc3 100644
--- a/Sprint-1/refactor/includes.js
+++ b/Sprint-1/refactor/includes.js
@@ -1,8 +1,7 @@
 // Refactor the implementation of includes to use a for...of loop
 
 function includes(list, target) {
-  for (let index = 0; index < list.length; index++) {
-    const element = list[index];
+    for (const item of items) {
     if (element === target) {
       return true;
     }
@@ -11,3 +10,4 @@ function includes(list, target) {
 }
 
 module.exports = includes;
+

From b3911a2c3b3d03b8eeba25cd72a5361c3df2b9fc Mon Sep 17 00:00:00 2001
From: joanne342 <130585013+joanne342@users.noreply.github.com>
Date: Thu, 9 Jul 2026 13:36:07 +0100
Subject: [PATCH 15/18] Update dedupe.js

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

diff --git a/Sprint-1/implement/dedupe.js b/Sprint-1/implement/dedupe.js
index 116d814a9..91c65ac28 100644
--- a/Sprint-1/implement/dedupe.js
+++ b/Sprint-1/implement/dedupe.js
@@ -7,3 +7,5 @@ function dedupe(arr) {
   }
   return array;
 }
+
+module.exports = dedupe;

From 409eefc292f6a24c8d0a5c13efd168ff4b244d90 Mon Sep 17 00:00:00 2001
From: joanne342 <130585013+joanne342@users.noreply.github.com>
Date: Thu, 9 Jul 2026 13:43:16 +0100
Subject: [PATCH 16/18] Update dedupe.test.js

---
 Sprint-1/implement/dedupe.test.js | 1 -
 1 file changed, 1 deletion(-)

diff --git a/Sprint-1/implement/dedupe.test.js b/Sprint-1/implement/dedupe.test.js
index b14bb8115..cb4dc4c7b 100644
--- a/Sprint-1/implement/dedupe.test.js
+++ b/Sprint-1/implement/dedupe.test.js
@@ -16,7 +16,6 @@ E.g. dedupe([1, 2, 1]) returns [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");
 
 // Given an array with no duplicates
 // When passed to the dedupe function

From 367204af2f7b2f8fbaa4c074d51cd4b489e20ddc Mon Sep 17 00:00:00 2001
From: joanne342 <130585013+joanne342@users.noreply.github.com>
Date: Wed, 15 Jul 2026 09:34:33 +0100
Subject: [PATCH 17/18] Update max.js

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

diff --git a/Sprint-1/implement/max.js b/Sprint-1/implement/max.js
index d9d84fea3..277a90697 100644
--- a/Sprint-1/implement/max.js
+++ b/Sprint-1/implement/max.js
@@ -1,7 +1,7 @@
 function findMax(elements) {
   const floats = elements
     .filter(x => {
-      const str = String(x).replace("-", "").replace(".", "");
+      const str = String(x);
       return !isNaN(str) && str !== "";
     })
     .map(x => Number(x));

From 8100bd59bd5213fa52866f44a9e316523e5da9bf Mon Sep 17 00:00:00 2001
From: joanne342 <130585013+joanne342@users.noreply.github.com>
Date: Wed, 15 Jul 2026 10:03:06 +0100
Subject: [PATCH 18/18] Update median.js

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

diff --git a/Sprint-1/fix/median.js b/Sprint-1/fix/median.js
index 1b6edac4e..c39a5797b 100644
--- a/Sprint-1/fix/median.js
+++ b/Sprint-1/fix/median.js
@@ -8,7 +8,7 @@ function calculateMedian(arr) {
 
   if (cleaned.length === 0) return null;
 
-  const sorted = [...cleaned].sort((a, b) => a - b);
+  const sorted = cleaned.sort((a, b) => a - b);
 
   const mid = Math.floor(sorted.length / 2);