diff --git a/Sprint-1/fix/median.js b/Sprint-1/fix/median.js
index b22590bc6..5883f864a 100644
--- a/Sprint-1/fix/median.js
+++ b/Sprint-1/fix/median.js
@@ -6,9 +6,28 @@
 // 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;
+  }
+
+  const nums = list.filter(i => typeof i === "number" && !isNaN(i));
+
+  if (nums.length === 0) {
+    return null;
+  }
+
+  const sorted = [...nums].sort((a, b) => a - b);
+ 
+  const len = sorted.length;
+  const mid = Math.floor(len / 2);
+
+
+  if (len % 2 === 1) {
+    return sorted[mid];
+  }
+
+  return (sorted[mid - 1] + sorted[mid]) / 2;
 }
 
 module.exports = calculateMedian;
diff --git a/Sprint-1/implement/dedupe.js b/Sprint-1/implement/dedupe.js
index 781e8718a..8709f15ca 100644
--- a/Sprint-1/implement/dedupe.js
+++ b/Sprint-1/implement/dedupe.js
@@ -1 +1,8 @@
-function dedupe() {}
+function dedupe(arr) {
+    return [...new Set (arr)];
+}
+console.log(dedupe([1, 2, 3]));
+console.log(dedupe([1, 1, 2, 3, 2, 3, 3]));
+console.log(dedupe([]));
+console.log(dedupe(["hello", undefined, 5, 5, "hello"]));
+
diff --git a/Sprint-1/implement/dedupe.test.js b/Sprint-1/implement/dedupe.test.js
index 23e0f8638..bc6c95743 100644
--- a/Sprint-1/implement/dedupe.test.js
+++ b/Sprint-1/implement/dedupe.test.js
@@ -16,12 +16,20 @@ 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([]);
+});
 
 // Given an array with no duplicates
 // When passed to the dedupe function
 // Then it should return a copy of the original array
+test("given an array with no duplicates, it returns a copy of the original array", () => {
+  expect(dedupe([1, 2, 3])).toEqual([1, 2, 3]);
+});
 
 // Given an array with strings or numbers
 // When passed to the dedupe function
-// Then it should remove the duplicate values, preserving the first occurence of each element
+// Then it should remove the duplicate values, preserving the first occurrence of each element
+test("Given an array with strings or numbers, remove the duplicate values, preserving the first occurrence of each element", () => {
+    expect(dedupe(["hello", undefined, 5, 5, "hello"])).toEqual(["hello", undefined, 5,]);
+});
\ No newline at end of file
diff --git a/Sprint-1/implement/max.js b/Sprint-1/implement/max.js
index 6dd76378e..83def2214 100644
--- a/Sprint-1/implement/max.js
+++ b/Sprint-1/implement/max.js
@@ -1,4 +1,12 @@
 function findMax(elements) {
+    const nums = elements.filter(i => typeof i === "number" && !isNaN(i));
+    
+    if (nums.length === 0) {
+        return "-infinity";
+    } else {
+        return Math.max(...nums);
+    }
+  
 }
 
 module.exports = findMax;
diff --git a/Sprint-1/implement/max.test.js b/Sprint-1/implement/max.test.js
index 82f18fd88..d6e158716 100644
--- a/Sprint-1/implement/max.test.js
+++ b/Sprint-1/implement/max.test.js
@@ -16,28 +16,44 @@ 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([])).toEqual("-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[50]).toEqual([50]);
+})
 // 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 largest overall", () => {
+    expect(findMax[-1, -3, 5, 7, 8]).toEqual(8);
+});
 // 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 negative numbers, returns closest to zero", () => {
+    expect(findMax[-7, -5, -2]).toEqual(-2);
+});
 // 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 number", () => {
+    expect(findMax[2.34, 2.35]).toEqual(2.35);
+});
 // 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-numbers, returns the max and ignore non-numeric values", () => {
+    expect(findMax["hello", 2, 5, -1]).toEqual(5);
+});
 // 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-numbers values, returns the largest surprising ", () => {
+    expect(findMax["5", "hello", "a2"]).toEqual("-infinity");
+});
\ No newline at end of file
diff --git a/Sprint-1/implement/sum.js b/Sprint-1/implement/sum.js
index 9062aafe3..d4c6fd8dc 100644
--- a/Sprint-1/implement/sum.js
+++ b/Sprint-1/implement/sum.js
@@ -1,4 +1,19 @@
-function sum(elements) {
+function sum(elements) {   
+    const numbers = elements.filter((i) => typeof i === "number" && !isNaN(i));
+
+        if (numbers.length === 0) {
+          return 0;
+        }
+
+    return numbers.reduce((total, num) => total + num, 0);
 }
 
+console.log(sum([10, 30, 45]));
+console.log(sum([10]));
+console.log(sum([-10, -30, -45]));
+console.log(sum([]));
+console.log(sum([10.5, 30, 45]));
+console.log(sum([NaN, null, 45, 10]));
+console.log(sum([NaN, null, "hello"]));
+
 module.exports = sum;
diff --git a/Sprint-1/implement/sum.test.js b/Sprint-1/implement/sum.test.js
index dd0a090ca..055a09239 100644
--- a/Sprint-1/implement/sum.test.js
+++ b/Sprint-1/implement/sum.test.js
@@ -13,24 +13,37 @@ 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([])).toEqual(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 just one number, returns that number", () => {
+    expect(sum[10, 20, 35]).toEqual(85);
+});
 // 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 sum", () => {
+    expect(sum[-10, -30, -45]).toEqual(-85);
+});
 // 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/float numbers, returns the correct total sum", () => {
+  expect(sum[10.5, 30, 45]).toEqual(85.5);
+});
 // 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("Given an array containing non-number values, ignore the non-numerical values and return the sum of the numerical elements", () => {
+  expect(sum[NaN, null, 45, 10]).toEqual(55);
+});
 // 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 the least surprising value", () => {
+  expect(sum[NaN, null, "hello"]).toEqual(55);
+});
\ No newline at end of file
diff --git a/Sprint-1/refactor/includes.js b/Sprint-1/refactor/includes.js
index 29dad81f0..8ddbb4dcc 100644
--- a/Sprint-1/refactor/includes.js
+++ b/Sprint-1/refactor/includes.js
@@ -1,13 +1,13 @@
 // 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 element of list) {
+  
     if (element === target) {
       return true;
     }
   }
-  return false;
+  return false; // return false added
 }
 
 module.exports = includes;