From 8c332a3f6f802da37e647df108b0078bf11df79c Mon Sep 17 00:00:00 2001
From: Alex Jamshidi <alexjamshidi@Alexs-MacBook-Air.local>
Date: Tue, 12 May 2026 16:25:51 +0100
Subject: [PATCH 1/8] added solution to median.js

---
 Sprint-1/fix/median.js | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/Sprint-1/fix/median.js b/Sprint-1/fix/median.js
index b22590bc6..98c165cce 100644
--- a/Sprint-1/fix/median.js
+++ b/Sprint-1/fix/median.js
@@ -6,9 +6,13 @@
 // 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;} 
+  let numberArray = list.filter(n => Number.isFinite(n))
+  if (numberArray.length == 0) {return null};
+  numberArray.sort((a, b) => a - b)
+
+  if (numberArray.length % 2 == 1) {return numberArray[((numberArray.length - 1) / 2)]}
+  else {return (numberArray[((numberArray.length / 2))] + numberArray[((numberArray.length / 2) - 1)]) / 2}
 }
 
 module.exports = calculateMedian;

From 5ae1e952db66f35af91e0bdb313d8a9def4dc96b Mon Sep 17 00:00:00 2001
From: Alex Jamshidi <alexjamshidi@Alexs-MacBook-Air.local>
Date: Tue, 12 May 2026 22:43:19 +0100
Subject: [PATCH 2/8] added tests for implement dedupe

---
 Sprint-1/implement/dedupe.js      |  6 +++++-
 Sprint-1/implement/dedupe.test.js | 28 +++++++++++++++++++++++++++-
 2 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/Sprint-1/implement/dedupe.js b/Sprint-1/implement/dedupe.js
index 781e8718a..bf8a5866c 100644
--- a/Sprint-1/implement/dedupe.js
+++ b/Sprint-1/implement/dedupe.js
@@ -1 +1,5 @@
-function dedupe() {}
+function dedupe(array) {
+    return [1, 2, 3]
+}
+
+module.exports = dedupe;
\ No newline at end of file
diff --git a/Sprint-1/implement/dedupe.test.js b/Sprint-1/implement/dedupe.test.js
index d7c8e3d8e..acc42cc42 100644
--- a/Sprint-1/implement/dedupe.test.js
+++ b/Sprint-1/implement/dedupe.test.js
@@ -16,13 +16,39 @@ 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");
+describe("dedupe", () => {
+  [
+    { input: [], expected: [] },
+  ].forEach(({ input, expected }) =>
+    it(`returns empty array for [${input}]`, () => expect(dedupe(input)).toEqual(expected))
+  );
+
 
 // Given an array with no duplicates
 // When passed to the dedupe function
 // Then it should return a copy of the original array
 
+  [
+    { input: [1, 2, 3], expected: [1, 2, 3] },
+    { input: [3, 2, 1, 4, 5], expected: [3, 2, 1, 4, 5] },
+    { input: ["hello", "a", "b", "c"], expected: ["hello", "a", "b", "c"] },
+    { input: [1, 2, "hello", 4, "a", 6], expected: [1, 2, "hello", 4, "a", 6] },
+  ].forEach(({ input, expected }) =>
+    it(`returns the median for [${input}]`, () => expect(dedupe(input)).toEqual(expected))
+  );
+
 // Given an array of strings or numbers
 // When passed to the dedupe function
 // Then it should return a new array with duplicates removed while preserving the 
 // first occurrence of each element from the original array.
+
+  [
+    { input: [1, 1, 2, 2, 3, 3,], expected: [1, 2, 3] },
+    { input: ["a", "a", "b", "b", "c", "c"], expected: ["a", "b", "c"] },
+    { input: ["qwe", "qwe", 3, 3, "hello", "hello" , "hello"], expected: ["qwe", 3, "hello"] },
+    { input: ["a", "a", "a", "a"], expected: ["a"] },
+    { input: [1, 2, 2, 2, 2, 2], expected: [1, 2] },
+  ].forEach(({ input, expected }) =>
+    it(`returns the median for [${input}]`, () => expect(dedupe(input)).toEqual(expected))
+  );
+});
\ No newline at end of file

From 81f05967ea0e838294e32169af57f1946117ae0b Mon Sep 17 00:00:00 2001
From: Alex Jamshidi <alexjamshidi@Alexs-MacBook-Air.local>
Date: Tue, 12 May 2026 22:51:00 +0100
Subject: [PATCH 3/8] added solution to implement dedupe

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

diff --git a/Sprint-1/implement/dedupe.js b/Sprint-1/implement/dedupe.js
index bf8a5866c..b4b3d6142 100644
--- a/Sprint-1/implement/dedupe.js
+++ b/Sprint-1/implement/dedupe.js
@@ -1,5 +1,11 @@
 function dedupe(array) {
-    return [1, 2, 3]
+    const unique = [];
+    array.forEach((item) => {
+        if (!unique.includes(item)) {
+            unique.push(item);
+        }
+    });
+    return unique
 }
 
 module.exports = dedupe;
\ No newline at end of file

From 0d3fb031f89a495fa7e359980c0680c55f96b1d8 Mon Sep 17 00:00:00 2001
From: Alex Jamshidi <alexjamshidi@Alexs-MacBook-Air.local>
Date: Tue, 12 May 2026 23:20:25 +0100
Subject: [PATCH 4/8] added solutions to max.js

---
 Sprint-1/implement/max.js      |  5 +++-
 Sprint-1/implement/max.test.js | 42 +++++++++++++++++++++++++++++++++-
 2 files changed, 45 insertions(+), 2 deletions(-)

diff --git a/Sprint-1/implement/max.js b/Sprint-1/implement/max.js
index 6dd76378e..77a27adb0 100644
--- a/Sprint-1/implement/max.js
+++ b/Sprint-1/implement/max.js
@@ -1,4 +1,7 @@
-function findMax(elements) {
+function findMax(list) {
+    const numbers = list.filter(n => Number.isFinite(n));
+    if (numbers.length == 0) { return "-Infinity"}
+    else {return Math.max(...numbers)};
 }
 
 module.exports = findMax;
diff --git a/Sprint-1/implement/max.test.js b/Sprint-1/implement/max.test.js
index 82f18fd88..abc39b2f8 100644
--- a/Sprint-1/implement/max.test.js
+++ b/Sprint-1/implement/max.test.js
@@ -12,32 +12,72 @@ We have set things up already so that this file can see your function from the o
 
 const findMax = require("./max.js");
 
+describe("calculateMedian", () => {
 // 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");
+
+  it("empty array returns -Infinity", () => {
+    const list = [];
+    expect(findMax(list)).toEqual("-Infinity");
+  });
 
 // Given an array with one number
 // When passed to the max function
 // Then it should return that number
 
+  it("array with one number returns that number", () => {
+    const list = [2];
+    expect(findMax(list)).toEqual(2);
+  });
+
 // Given an array with both positive and negative numbers
 // When passed to the max function
 // Then it should return the largest number overall
 
+  it("array with +ve and -ve numbers, returns largest number overall", () => {
+    const list = [10, -15];
+    expect(findMax(list)).toEqual(10);
+  });
+
+
 // Given an array with just negative numbers
 // When passed to the max function
 // Then it should return the closest one to zero
 
+  it("array -ve numbers, returns closest to zero", () => {
+    const list = [-1, -2, -3, -15];
+    expect(findMax(list)).toEqual(-1);
+  });
+
+
 // Given an array with decimal numbers
 // When passed to the max function
 // Then it should return the largest decimal number
 
+  it("array with decimal numbers should return largest decimal number", () => {
+    const list = [1.9, 2.8999, 3.1];
+    expect(findMax(list)).toEqual(3.1);
+  });
+
+
 // Given an array with non-number values
 // When passed to the max function
 // Then it should return the max and ignore non-numeric values
 
+  it("array with non-number values, returns the max and ignore non-numeric values", () => {
+    const list = [1, "a", 2, "b", 3, "c"];
+    expect(findMax(list)).toEqual(3);
+  });
+
+
 // 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
+
+  it("array with only non-number values, return the least surprising value given how it behaves for all other inputs", () => {
+    const list = ["a", "b", "c"];
+    expect(findMax(list)).toEqual("-Infinity");
+  });
+});
\ No newline at end of file

From 357426d3ad6f3d7c4c8014eca21420268a7e5b2a Mon Sep 17 00:00:00 2001
From: Alex Jamshidi <alexjamshidi@Alexs-MacBook-Air.local>
Date: Tue, 12 May 2026 23:29:03 +0100
Subject: [PATCH 5/8] tests added for sum.test.js in implement

---
 Sprint-1/implement/sum.js      |  3 ++-
 Sprint-1/implement/sum.test.js | 31 ++++++++++++++++++++++++++++++-
 2 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/Sprint-1/implement/sum.js b/Sprint-1/implement/sum.js
index 9062aafe3..1f8d19de6 100644
--- a/Sprint-1/implement/sum.js
+++ b/Sprint-1/implement/sum.js
@@ -1,4 +1,5 @@
-function sum(elements) {
+function sum(list) {
+    return 0
 }
 
 module.exports = sum;
diff --git a/Sprint-1/implement/sum.test.js b/Sprint-1/implement/sum.test.js
index dd0a090ca..d16782e64 100644
--- a/Sprint-1/implement/sum.test.js
+++ b/Sprint-1/implement/sum.test.js
@@ -10,27 +10,56 @@ const sum = require("./sum.js");
 
 // Acceptance Criteria:
 
+describe("sum", () => {
 // Given an empty array
 // When passed to the sum function
 // Then it should return 0
-test.todo("given an empty array, returns 0")
+  it("empty array returns 0", () => {
+    const list = [];
+    expect(sum(list)).toEqual(0);
+  });
 
 // Given an array with just one number
 // When passed to the sum function
 // Then it should return that number
+  it("array with one number returns number", () => {
+    const list = [1];
+    expect(sum(list)).toEqual(1);
+  });
 
 // Given an array containing negative numbers
 // When passed to the sum function
 // Then it should still return the correct total sum
 
+  it("array with negative numbers returns correct sum", () => {
+    const list = [-1, -2, -3];
+    expect(sum(list)).toEqual(-6);
+  });
+
 // Given an array with decimal/float numbers
 // When passed to the sum function
 // Then it should return the correct total sum
 
+  it("array with decimal numbers returns correct sum", () => {
+    const list = [1.1, 2.2, 3.3];
+    expect(sum(list)).toEqual(6.6);
+  });
+
 // 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
 
+  it("array with non-number values returns sum of numerical values only", () => {
+    const list = [1];
+    expect(sum(list)).toEqual(1);
+  });
+
 // 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
+
+  it("array with non-number values only returns least surprising output", () => {
+    const list = [1];
+    expect(sum(list)).toEqual(0);
+  });
+});
\ No newline at end of file

From ee7e6d499dcd6209ad2cf79fb61dd3caaeb2ecf6 Mon Sep 17 00:00:00 2001
From: Alex Jamshidi <alexjamshidi@Alexs-MacBook-Air.local>
Date: Tue, 12 May 2026 23:34:46 +0100
Subject: [PATCH 6/8] added solutions to sum.js in implement

---
 Sprint-1/implement/sum.js      | 5 ++++-
 Sprint-1/implement/sum.test.js | 6 +++---
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/Sprint-1/implement/sum.js b/Sprint-1/implement/sum.js
index 1f8d19de6..5c909fc91 100644
--- a/Sprint-1/implement/sum.js
+++ b/Sprint-1/implement/sum.js
@@ -1,5 +1,8 @@
 function sum(list) {
-    return 0
+    const numbers = list.filter(n => Number.isFinite(n));
+    let total = 0;
+    for (n of numbers) {total += n};
+    return total;
 }
 
 module.exports = sum;
diff --git a/Sprint-1/implement/sum.test.js b/Sprint-1/implement/sum.test.js
index d16782e64..806b8695d 100644
--- a/Sprint-1/implement/sum.test.js
+++ b/Sprint-1/implement/sum.test.js
@@ -50,8 +50,8 @@ describe("sum", () => {
 // Then it should ignore the non-numerical values and return the sum of the numerical elements
 
   it("array with non-number values returns sum of numerical values only", () => {
-    const list = [1];
-    expect(sum(list)).toEqual(1);
+    const list = [1, 2, "apple", 4, "banana", 3];
+    expect(sum(list)).toEqual(10);
   });
 
 // Given an array with only non-number values
@@ -59,7 +59,7 @@ describe("sum", () => {
 // Then it should return the least surprising value given how it behaves for all other inputs
 
   it("array with non-number values only returns least surprising output", () => {
-    const list = [1];
+    const list = ["a", "b", "c"];
     expect(sum(list)).toEqual(0);
   });
 });
\ No newline at end of file

From 4e0a556f0b913b6a148ff1ada875ec9519194c59 Mon Sep 17 00:00:00 2001
From: Alex Jamshidi <alexjamshidi@Alexs-MacBook-Air.local>
Date: Tue, 12 May 2026 23:44:48 +0100
Subject: [PATCH 7/8] changed includes.js code to add for...of loop

---
 Sprint-1/refactor/includes.js | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/Sprint-1/refactor/includes.js b/Sprint-1/refactor/includes.js
index 29dad81f0..b779c8586 100644
--- a/Sprint-1/refactor/includes.js
+++ b/Sprint-1/refactor/includes.js
@@ -1,6 +1,15 @@
 // Refactor the implementation of includes to use a for...of loop
 
 function includes(list, target) {
+for (item of list) {if (item === target) {return true;}}
+    return false;
+}
+
+module.exports = includes;
+
+
+/* Old code:
+
   for (let index = 0; index < list.length; index++) {
     const element = list[index];
     if (element === target) {
@@ -8,6 +17,4 @@ function includes(list, target) {
     }
   }
   return false;
-}
-
-module.exports = includes;
+*/

From 350ad2e7bcd160db0b206495fe8ba3fa5824baef Mon Sep 17 00:00:00 2001
From: Alex Jamshidi <alexjamshidi@Alexs-MacBook-Air.local>
Date: Wed, 13 May 2026 16:53:14 +0100
Subject: [PATCH 8/8] code formatter with prettier

---
 Sprint-1/fix/median.js         | 23 ++++++++++++----
 Sprint-1/fix/median.test.js    | 22 +++++++++++----
 Sprint-1/implement/dedupe.js   | 16 +++++------
 Sprint-1/implement/max.js      |  9 ++++--
 Sprint-1/implement/max.test.js | 50 ++++++++++++++++------------------
 Sprint-1/implement/sum.js      | 10 ++++---
 Sprint-1/implement/sum.test.js | 38 +++++++++++++-------------
 Sprint-1/refactor/includes.js  |  9 ++++--
 8 files changed, 102 insertions(+), 75 deletions(-)

diff --git a/Sprint-1/fix/median.js b/Sprint-1/fix/median.js
index 98c165cce..1f42edab0 100644
--- a/Sprint-1/fix/median.js
+++ b/Sprint-1/fix/median.js
@@ -6,13 +6,24 @@
 // or 'list' has mixed values (the function is expected to sort only numbers).
 
 function calculateMedian(list) {
-  if (!Array.isArray(list)) {return null;} 
-  let numberArray = list.filter(n => Number.isFinite(n))
-  if (numberArray.length == 0) {return null};
-  numberArray.sort((a, b) => a - b)
+  if (!Array.isArray(list)) {
+    return null;
+  }
+  let numberArray = list.filter((n) => Number.isFinite(n));
+  if (numberArray.length == 0) {
+    return null;
+  }
+  numberArray.sort((a, b) => a - b);
 
-  if (numberArray.length % 2 == 1) {return numberArray[((numberArray.length - 1) / 2)]}
-  else {return (numberArray[((numberArray.length / 2))] + numberArray[((numberArray.length / 2) - 1)]) / 2}
+  if (numberArray.length % 2 == 1) {
+    return numberArray[(numberArray.length - 1) / 2];
+  } else {
+    return (
+      (numberArray[numberArray.length / 2] +
+        numberArray[numberArray.length / 2 - 1]) /
+      2
+    );
+  }
 }
 
 module.exports = calculateMedian;
diff --git a/Sprint-1/fix/median.test.js b/Sprint-1/fix/median.test.js
index 21da654d7..c262c3776 100644
--- a/Sprint-1/fix/median.test.js
+++ b/Sprint-1/fix/median.test.js
@@ -13,7 +13,8 @@ describe("calculateMedian", () => {
     { input: [1, 2, 3, 4], expected: 2.5 },
     { input: [1, 2, 3, 4, 5, 6], expected: 3.5 },
   ].forEach(({ input, expected }) =>
-    it(`returns the median for [${input}]`, () => expect(calculateMedian(input)).toEqual(expected))
+    it(`returns the median for [${input}]`, () =>
+      expect(calculateMedian(input)).toEqual(expected))
   );
 
   [
@@ -24,7 +25,8 @@ describe("calculateMedian", () => {
     { input: [110, 20, 0], expected: 20 },
     { input: [6, -2, 2, 12, 14], expected: 6 },
   ].forEach(({ input, expected }) =>
-    it(`returns the correct median for unsorted array [${input}]`, () => expect(calculateMedian(input)).toEqual(expected))
+    it(`returns the correct median for unsorted array [${input}]`, () =>
+      expect(calculateMedian(input)).toEqual(expected))
   );
 
   it("doesn't modify the input array [3, 1, 2]", () => {
@@ -33,8 +35,17 @@ describe("calculateMedian", () => {
     expect(list).toEqual([3, 1, 2]);
   });
 
-  [ 'not an array', 123, null, undefined, {}, [], ["apple", null, undefined] ].forEach(val =>
-    it(`returns null for non-numeric array (${val})`, () => expect(calculateMedian(val)).toBe(null))
+  [
+    "not an array",
+    123,
+    null,
+    undefined,
+    {},
+    [],
+    ["apple", null, undefined],
+  ].forEach((val) =>
+    it(`returns null for non-numeric array (${val})`, () =>
+      expect(calculateMedian(val)).toBe(null))
   );
 
   [
@@ -45,6 +56,7 @@ describe("calculateMedian", () => {
     { input: [3, "apple", 1, null, 2, undefined, 4], expected: 2.5 },
     { input: ["banana", 5, 3, "apple", 1, 4, 2], expected: 3 },
   ].forEach(({ input, expected }) =>
-    it(`filters out non-numeric values and calculates the median for [${input}]`, () => expect(calculateMedian(input)).toEqual(expected))
+    it(`filters out non-numeric values and calculates the median for [${input}]`, () =>
+      expect(calculateMedian(input)).toEqual(expected))
   );
 });
diff --git a/Sprint-1/implement/dedupe.js b/Sprint-1/implement/dedupe.js
index b4b3d6142..4ead32366 100644
--- a/Sprint-1/implement/dedupe.js
+++ b/Sprint-1/implement/dedupe.js
@@ -1,11 +1,11 @@
 function dedupe(array) {
-    const unique = [];
-    array.forEach((item) => {
-        if (!unique.includes(item)) {
-            unique.push(item);
-        }
-    });
-    return unique
+  const unique = [];
+  array.forEach((item) => {
+    if (!unique.includes(item)) {
+      unique.push(item);
+    }
+  });
+  return unique;
 }
 
-module.exports = dedupe;
\ No newline at end of file
+module.exports = dedupe;
diff --git a/Sprint-1/implement/max.js b/Sprint-1/implement/max.js
index 77a27adb0..5c779794e 100644
--- a/Sprint-1/implement/max.js
+++ b/Sprint-1/implement/max.js
@@ -1,7 +1,10 @@
 function findMax(list) {
-    const numbers = list.filter(n => Number.isFinite(n));
-    if (numbers.length == 0) { return "-Infinity"}
-    else {return Math.max(...numbers)};
+  const numbers = list.filter((n) => Number.isFinite(n));
+  if (numbers.length == 0) {
+    return "-Infinity";
+  } else {
+    return Math.max(...numbers);
+  }
 }
 
 module.exports = findMax;
diff --git a/Sprint-1/implement/max.test.js b/Sprint-1/implement/max.test.js
index abc39b2f8..6db256392 100644
--- a/Sprint-1/implement/max.test.js
+++ b/Sprint-1/implement/max.test.js
@@ -13,71 +13,67 @@ We have set things up already so that this file can see your function from the o
 const findMax = require("./max.js");
 
 describe("calculateMedian", () => {
-// 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.
+  // 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.
 
   it("empty array returns -Infinity", () => {
     const list = [];
     expect(findMax(list)).toEqual("-Infinity");
   });
 
-// Given an array with one number
-// When passed to the max function
-// Then it should return that number
+  // Given an array with one number
+  // When passed to the max function
+  // Then it should return that number
 
   it("array with one number returns that number", () => {
     const list = [2];
     expect(findMax(list)).toEqual(2);
   });
 
-// Given an array with both positive and negative numbers
-// When passed to the max function
-// Then it should return the largest number overall
+  // Given an array with both positive and negative numbers
+  // When passed to the max function
+  // Then it should return the largest number overall
 
   it("array with +ve and -ve numbers, returns largest number overall", () => {
     const list = [10, -15];
     expect(findMax(list)).toEqual(10);
   });
 
-
-// Given an array with just negative numbers
-// When passed to the max function
-// Then it should return the closest one to zero
+  // Given an array with just negative numbers
+  // When passed to the max function
+  // Then it should return the closest one to zero
 
   it("array -ve numbers, returns closest to zero", () => {
     const list = [-1, -2, -3, -15];
     expect(findMax(list)).toEqual(-1);
   });
 
-
-// Given an array with decimal numbers
-// When passed to the max function
-// Then it should return the largest decimal number
+  // Given an array with decimal numbers
+  // When passed to the max function
+  // Then it should return the largest decimal number
 
   it("array with decimal numbers should return largest decimal number", () => {
     const list = [1.9, 2.8999, 3.1];
     expect(findMax(list)).toEqual(3.1);
   });
 
-
-// Given an array with non-number values
-// When passed to the max function
-// Then it should return the max and ignore non-numeric values
+  // Given an array with non-number values
+  // When passed to the max function
+  // Then it should return the max and ignore non-numeric values
 
   it("array with non-number values, returns the max and ignore non-numeric values", () => {
     const list = [1, "a", 2, "b", 3, "c"];
     expect(findMax(list)).toEqual(3);
   });
 
-
-// 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
+  // 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
 
   it("array with only non-number values, return the least surprising value given how it behaves for all other inputs", () => {
     const list = ["a", "b", "c"];
     expect(findMax(list)).toEqual("-Infinity");
   });
-});
\ No newline at end of file
+});
diff --git a/Sprint-1/implement/sum.js b/Sprint-1/implement/sum.js
index 5c909fc91..249515398 100644
--- a/Sprint-1/implement/sum.js
+++ b/Sprint-1/implement/sum.js
@@ -1,8 +1,10 @@
 function sum(list) {
-    const numbers = list.filter(n => Number.isFinite(n));
-    let total = 0;
-    for (n of numbers) {total += n};
-    return total;
+  const numbers = list.filter((n) => Number.isFinite(n));
+  let total = 0;
+  for (n of numbers) {
+    total += n;
+  }
+  return total;
 }
 
 module.exports = sum;
diff --git a/Sprint-1/implement/sum.test.js b/Sprint-1/implement/sum.test.js
index 806b8695d..832e11353 100644
--- a/Sprint-1/implement/sum.test.js
+++ b/Sprint-1/implement/sum.test.js
@@ -11,55 +11,55 @@ const sum = require("./sum.js");
 // Acceptance Criteria:
 
 describe("sum", () => {
-// Given an empty array
-// When passed to the sum function
-// Then it should return 0
+  // Given an empty array
+  // When passed to the sum function
+  // Then it should return 0
   it("empty array returns 0", () => {
     const list = [];
     expect(sum(list)).toEqual(0);
   });
 
-// Given an array with just one number
-// When passed to the sum function
-// Then it should return that number
+  // Given an array with just one number
+  // When passed to the sum function
+  // Then it should return that number
   it("array with one number returns number", () => {
     const list = [1];
     expect(sum(list)).toEqual(1);
   });
 
-// Given an array containing negative numbers
-// When passed to the sum function
-// Then it should still return the correct total sum
+  // Given an array containing negative numbers
+  // When passed to the sum function
+  // Then it should still return the correct total sum
 
   it("array with negative numbers returns correct sum", () => {
     const list = [-1, -2, -3];
     expect(sum(list)).toEqual(-6);
   });
 
-// Given an array with decimal/float numbers
-// When passed to the sum function
-// Then it should return the correct total sum
+  // Given an array with decimal/float numbers
+  // When passed to the sum function
+  // Then it should return the correct total sum
 
   it("array with decimal numbers returns correct sum", () => {
     const list = [1.1, 2.2, 3.3];
     expect(sum(list)).toEqual(6.6);
   });
 
-// 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
+  // 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
 
   it("array with non-number values returns sum of numerical values only", () => {
     const list = [1, 2, "apple", 4, "banana", 3];
     expect(sum(list)).toEqual(10);
   });
 
-// 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
+  // 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
 
   it("array with non-number values only returns least surprising output", () => {
     const list = ["a", "b", "c"];
     expect(sum(list)).toEqual(0);
   });
-});
\ No newline at end of file
+});
diff --git a/Sprint-1/refactor/includes.js b/Sprint-1/refactor/includes.js
index b779c8586..c5b01e86c 100644
--- a/Sprint-1/refactor/includes.js
+++ b/Sprint-1/refactor/includes.js
@@ -1,13 +1,16 @@
 // Refactor the implementation of includes to use a for...of loop
 
 function includes(list, target) {
-for (item of list) {if (item === target) {return true;}}
-    return false;
+  for (item of list) {
+    if (item === target) {
+      return true;
+    }
+  }
+  return false;
 }
 
 module.exports = includes;
 
-
 /* Old code:
 
   for (let index = 0; index < list.length; index++) {