diff --git a/Sprint-1/fix/median.js b/Sprint-1/fix/median.js
index b22590bc6..5d69334a4 100644
--- a/Sprint-1/fix/median.js
+++ b/Sprint-1/fix/median.js
@@ -6,9 +6,18 @@
 // 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 numericValue = list.filter(n => typeof n === 'number' && !isNaN(n));
+  if (numericValue.length === 0) return null;
+
+  const sorted = [...numericValue].sort((a, b) => a - b);
+
+  const middleIndex = Math.floor(sorted.length / 2);
+  
+  return sorted.length % 2 === 0
+    ? (sorted[middleIndex - 1] + sorted[middleIndex]) / 2
+    : sorted[middleIndex];
 }
 
-module.exports = calculateMedian;
+module.exports = calculateMedian;
\ No newline at end of file
diff --git a/Sprint-1/fix/median.test.js b/Sprint-1/fix/median.test.js
index 21da654d7..f835df31b 100644
--- a/Sprint-1/fix/median.test.js
+++ b/Sprint-1/fix/median.test.js
@@ -6,7 +6,7 @@
 
 const calculateMedian = require("./median.js");
 
-describe("calculateMedian", () => {
+
   [
     { input: [1, 2, 3], expected: 2 },
     { input: [1, 2, 3, 4, 5], expected: 3 },
@@ -47,4 +47,3 @@ describe("calculateMedian", () => {
   ].forEach(({ input, 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 781e8718a..52a75d491 100644
--- a/Sprint-1/implement/dedupe.js
+++ b/Sprint-1/implement/dedupe.js
@@ -1 +1,6 @@
-function dedupe() {}
+function dedupe(groupNumber) {
+    return [...new Set(groupNumber)];
+
+}
+
+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 23e0f8638..b449ad401 100644
--- a/Sprint-1/implement/dedupe.test.js
+++ b/Sprint-1/implement/dedupe.test.js
@@ -16,12 +16,33 @@ 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", () => {
+  const input = [];
+  const result = dedupe(input);
+  expect(result).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", () => {
+  const input = [1, 2, 3, 4, 5];
+  const result = dedupe(input);
+  expect(result).toEqual([1, 2, 3, 4, 5]);
+});
 
 // 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
+test("given an array with a strings", () => {
+  const input = ["a", "a", "b", "b", "c", "c", "d", "d", "e", "e"];
+  const result = dedupe(input);
+  expect(result).toEqual(["a", "b", "c", "d", "e"]);
+});
+
+test("given an array with number", () => {
+  const input = [1, 1, 2, 2, 3, 3, 4, 4, 5, 5];
+  const result = dedupe(input);
+  expect(result).toEqual([1, 2, 3, 4, 5]);
+});
\ No newline at end of file
diff --git a/Sprint-1/implement/max.js b/Sprint-1/implement/max.js
index 6dd76378e..2a7540727 100644
--- a/Sprint-1/implement/max.js
+++ b/Sprint-1/implement/max.js
@@ -1,4 +1,8 @@
 function findMax(elements) {
+    if (!Array.isArray(elements)) return null
+    const maxNum = elements.filter(n => typeof n === 'number' && !isNaN(n))
+    return Math.max(...maxNum)
 }
 
+
 module.exports = findMax;
diff --git a/Sprint-1/implement/max.test.js b/Sprint-1/implement/max.test.js
index 82f18fd88..19eab5400 100644
--- a/Sprint-1/implement/max.test.js
+++ b/Sprint-1/implement/max.test.js
@@ -16,28 +16,70 @@ 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, return-Infinity", () => {
+  const input = [];
+  const result = findMax(input);
+  expect(result).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 ine number, return-that number", () => {
+  const input = [10];
+  const result = findMax(input);
+  expect(result).toEqual(10);
+});
+
+
 // 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 both Positive and negative numbers, return-the largest number", () => {
+  const input = [10, 70, 5, -30, 20, -10, -100];
+  const result = findMax(input);
+  expect(result).toEqual(70);
+});
+
 // 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 number", () => {
+  const input = [-10, -30, -5, -40, -50];
+  const result = findMax(input);
+  expect(result).toEqual(-5);
+});
+
+
 // Given an array with decimal numbers
 // When passed to the max function
 // Then it should return the largest decimal number
 
+test("given an empty array, return-Infinity", () => {
+  const input = [0.1, 0.5, 0.03, 0.009, 0.9, 1.1, 7.9 ];
+  const result = findMax(input);
+  expect(result).toEqual(7.9);
+});
+
 // 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, return-Infinity", () => {
+  const input = [10, 5, "banana", 60, "goat", "zebra", 5]
+  const result = findMax(input);
+  expect(result).toEqual(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, return-Infinity", () => {
+  const input = ["car", "train", "bus", "bmw"]
+  const result = findMax(input);
+  expect(result).toEqual(-Infinity)
+});
\ No newline at end of file
diff --git a/Sprint-1/implement/sum.js b/Sprint-1/implement/sum.js
index 9062aafe3..be6cce002 100644
--- a/Sprint-1/implement/sum.js
+++ b/Sprint-1/implement/sum.js
@@ -1,4 +1,7 @@
 function sum(elements) {
-}
+    if (!Array.isArray(elements)) return null
+    const sumNum = elements.filter(n => typeof n === 'number' && !isNaN(n))
+    return sumNum.reduce((accumulator, currentValue) => accumulator + currentValue, 0);
+};
 
 module.exports = sum;
diff --git a/Sprint-1/implement/sum.test.js b/Sprint-1/implement/sum.test.js
index dd0a090ca..057b4fe44 100644
--- a/Sprint-1/implement/sum.test.js
+++ b/Sprint-1/implement/sum.test.js
@@ -13,24 +13,53 @@ 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, return 0", () => {
+  const input = [];
+  const result = sum(input);
+  expect(result).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 one number", () => {
+  const input = [10];
+  const result = sum(input);
+  expect(result).toEqual(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 a negative number", () => {
+  const input = [-10, -20, -30, -40];
+  const result = sum(input);
+  expect(result).toEqual(-100);
+});
 
 // 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 number", () => {
+  const input = [0.1, 0.2, 0.3, 0.4];
+  const result = sum(input);
+  expect(result).toEqual(1);
+});
 
 // 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", () => {
+  const input = [10,"glasgow", 30, "london", 50, "asmara", 60, "massawa"];
+  const result = sum(input);
+  expect(result).toEqual(150);
+});
 
 // 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 containing non-number", () => {
+  const input = ["Nairobi","Glasgow", "London", "Asmara","Edinburgh", "Massawa"];
+  const result = sum(input);
+  expect(result).toEqual(0);
+});
\ No newline at end of file
diff --git a/Sprint-1/refactor/includes.js b/Sprint-1/refactor/includes.js
index 29dad81f0..3a4dc227f 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
 
 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-1/refactor/includes.test.js b/Sprint-1/refactor/includes.test.js
index 812158470..8a51f2103 100644
--- a/Sprint-1/refactor/includes.test.js
+++ b/Sprint-1/refactor/includes.test.js
@@ -36,3 +36,4 @@ test("searches for null", () => {
 
   expect(currentOutput).toEqual(targetOutput);
 });
+
diff --git a/Sprint-1/stretch/aoc-2018-day1/solution.js b/Sprint-1/stretch/aoc-2018-day1/solution.js
index e69de29bb..45faff635 100644
--- a/Sprint-1/stretch/aoc-2018-day1/solution.js
+++ b/Sprint-1/stretch/aoc-2018-day1/solution.js
@@ -0,0 +1,10 @@
+function calibrateFrequency(changesInTime) {
+  // we need to Start from a frequency of 0
+  let frequency = 0;
+
+  // Apply each change in order
+  for (let change of changesInTime) {
+    frequency += parseInt(change, 10);
+  }
+
+  return frequency;
\ No newline at end of file