diff --git a/Sprint-1/fix/median.js b/Sprint-1/fix/median.js
index 5c5b796e1..0f831c6ce 100644
--- a/Sprint-1/fix/median.js
+++ b/Sprint-1/fix/median.js
@@ -1,14 +1,20 @@
-// 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' isn't an array, is empty,
-// or contains values that aren't numbers (the function is expected to throw - see the tests).
-
 function calculateMedian(list) {
-  const middleIndex = Math.floor(list.length / 2);
-  const median = list.splice(middleIndex, 1)[0];
-  return median;
+  if (!Array.isArray(list)) {
+    throw new Error("calculateMedian requires an array of numbers");
+  }
+  if (list.length === 0) {
+    throw new Error("calculateMedian requires a non-empty array");
+  }
+  if (!list.every((item) => typeof item === "number")) {
+    throw new Error("calculateMedian requires an array of numbers");
+  }
+  const sorted = [...list].sort((a, b) => a - b);
+  const middleIndex = Math.floor(sorted.length / 2);
+  if (sorted.length % 2 === 0) {
+    return (sorted[middleIndex - 1] + sorted[middleIndex]) / 2;
+  }
+
+  return sorted[middleIndex];
 }
 
 module.exports = calculateMedian;
diff --git a/Sprint-1/implement/dedupe.js b/Sprint-1/implement/dedupe.js
index 781e8718a..b54117bd9 100644
--- a/Sprint-1/implement/dedupe.js
+++ b/Sprint-1/implement/dedupe.js
@@ -1 +1,11 @@
-function dedupe() {}
+function dedupe(list) {
+  const result = [];
+  for (const item of list) {
+    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 d7c8e3d8e..b20e1f851 100644
--- a/Sprint-1/implement/dedupe.test.js
+++ b/Sprint-1/implement/dedupe.test.js
@@ -1,28 +1,13 @@
 const dedupe = require("./dedupe.js");
-/*
-Dedupe Array
 
-📖 Dedupe means **deduplicate**
+test("given an empty array, it returns an empty array", () => {
+  expect(dedupe([])).toEqual([]);
+});
 
-In this kata, you will need to deduplicate the elements of an array
+test("returns a a copy with no duplicates", () => {
+  expect(dedupe(["a", "a", "a", "b", "b", "c"])).toEqual(["a", "b", "c"]);
+});
 
-E.g. dedupe(['a','a','a','b','b','c']) returns ['a','b','c']
-E.g. dedupe([5, 1, 1, 2, 3, 2, 5, 8]) returns [5, 1, 2, 3, 8]
-E.g. dedupe([1, 2, 1]) returns [1, 2]
-*/
-
-// Acceptance Criteria:
-
-// 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
-// Then it should return a copy of the original array
-
-// 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.
+test("keeps the first occurrence order", () => {
+  expect(dedupe([5, 1, 1, 2, 3, 2, 5, 8])).toEqual([5, 1, 2, 3, 8]);
+});
diff --git a/Sprint-1/implement/describe-median.js b/Sprint-1/implement/describe-median.js
index 3381cfc0a..e6a0a4033 100644
--- a/Sprint-1/implement/describe-median.js
+++ b/Sprint-1/implement/describe-median.js
@@ -20,6 +20,13 @@ function calculateMedian(list) {
 }
 
 // Implement this function. See describe-median.test.js for the acceptance criteria.
-function describeMedian(list) {}
+function describeMedian(list) {
+  try {
+    const median = calculateMedian(list);
+    return "The median is " + median;
+  } catch (error) {
+    return "Could not calculate a median: " + error.message;
+  }
+}
 
 module.exports = describeMedian;
diff --git a/Sprint-1/implement/describe-median.test.js b/Sprint-1/implement/describe-median.test.js
index e7d18a264..711d96791 100644
--- a/Sprint-1/implement/describe-median.test.js
+++ b/Sprint-1/implement/describe-median.test.js
@@ -1,32 +1,18 @@
-/* Describe the median, or explain why there isn't one
-
-calculateMedian is given to you at the top of describe-median.js. It throws
-when it can't calculate a median. Don't change it.
-
-Implement describeMedian, which calls calculateMedian and returns a sentence
-instead of crashing.
-
-E.g. describeMedian([1, 2, 3]), target output: "The median is 2"
-E.g. describeMedian([]), target output: "Could not calculate a median: calculateMedian requires a non-empty array"
-
-You'll need a try/catch block for this. The catch block must use the error's
-message, so the caller can see what went wrong.
-*/
-
 const describeMedian = require("./describe-median.js");
 
-// Acceptance criteria:
 
-// Given an array of numbers
-// When passed to describeMedian
-// Then it should return "The median is " followed by the median
-// Delete this test.todo and replace it with a test.
-test.todo('given [1, 2, 3], returns "The median is 2"');
+test('given [1, 2, 3], returns "The median is 2"', () => {
+  expect(describeMedian([1, 2, 3])).toBe("The median is 2");
+});
 
-// Given an empty array
-// When passed to describeMedian
-// Then it should return "Could not calculate a median: calculateMedian requires a non-empty array"
+test("returns a sentence for an empty array", () => {
+  expect(describeMedian([])).toBe(
+    "Could not calculate a median: calculateMedian requires a non-empty array"
+  );
+});
 
-// Given something that isn't an array of numbers, e.g. "banana"
-// When passed to describeMedian
-// Then it should return "Could not calculate a median: calculateMedian requires an array of numbers"
+test("return a sentence for a non-array", () => {
+  expect(describeMedian("banana")).toBe(
+    "Could not calculate a median: calculateMedian requires an array of numbers"
+  );
+});
diff --git a/Sprint-1/implement/max.js b/Sprint-1/implement/max.js
index 6dd76378e..2d1147c06 100644
--- a/Sprint-1/implement/max.js
+++ b/Sprint-1/implement/max.js
@@ -1,4 +1,23 @@
 function findMax(elements) {
+  if (!Array.isArray(elements)) {
+    throw new Error("findMax requires an array of numbers");
+  }
+
+  if (elements.length === 0) {
+    return -Infinity;
+  }
+
+  if (!elements.every((item) => typeof item === "number")) {
+    throw new Error("findMax requires an array of numbers");
+  }
+
+  let max = elements[0];
+  for (const item of elements) {
+    if (item > max) {
+      max = item;
+    }
+  }
+  return max;
 }
 
 module.exports = findMax;
diff --git a/Sprint-1/implement/max.test.js b/Sprint-1/implement/max.test.js
index ff3fbb5e5..61090ad8c 100644
--- a/Sprint-1/implement/max.test.js
+++ b/Sprint-1/implement/max.test.js
@@ -1,43 +1,33 @@
-/* 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]) throws Error("findMax requires an array of numbers") (max can't compare non-numerical elements, so it shouldn't guess)
-
-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");
-
-// Given an array with one number
-// When passed to the max function
-// Then it should return that number
-
-// 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 just negative numbers
-// When passed to the max function
-// Then it should return the closest one to zero
-
-// Given an array with decimal numbers
-// When passed to the max function
-// Then it should return the largest decimal number
-
-// Given an array containing a value that isn't a number
-// When passed to the max function
-// Then it should throw Error("findMax requires an array of numbers")
-
-// Given something that isn't an array at all, such as "hey", 42 or no argument
-// When passed to the max function
-// Then it should throw Error("findMax requires an array of numbers")
+test("given an empty array, returns -Infinity", () => {
+  expect(findMax([])).toBe(-Infinity);
+});
+
+test("given an array with one number, returns that number", () => {
+  expect(findMax([7])).toBe(7);
+});
+
+test("returns the largest of positive and negative numbers", () => {
+  expect(findMax([-6, 5, -3, 8])).toBe(8);
+});
+
+test("returns the closest to zero for all negatives", () => {
+  expect(findMax([-9, -2, -6])).toBe(-2);
+});
+
+test("returns the largest decimal number", () => {
+  expect(findMax([1.2, 3.8, 2.6])).toBe(3.8);
+});
+
+test("throws for an array containing a non-number", () => {
+  expect(() => findMax(["hey", 10])).toThrow(
+    new Error("findMax requires an array of numbers")
+  );
+});
+
+test("throws when not given an array", () => {
+  expect(() => findMax("hey")).toThrow(
+    new Error("findMax requires an array of numbers")
+  );
+});
diff --git a/Sprint-1/implement/mean.js b/Sprint-1/implement/mean.js
index 36909ea1f..340508a03 100644
--- a/Sprint-1/implement/mean.js
+++ b/Sprint-1/implement/mean.js
@@ -1,3 +1,18 @@
-function calculateMean(list) {}
+function calculateMean(list) {
+  if (!Array.isArray(list)) {
+    throw new Error("calculateMean requires an array of numbers");
+  }
+  if (list.length === 0) {
+    throw new Error("calculateMean requires a non-empty array");
+  }
+  if (!list.every((item) => typeof item === "number")) {
+    throw new Error("calculateMean requires an array of numbers");
+  }
+  let total = 0;
+  for (const item of list) {
+    total += item;
+  }
+  return total / list.length;
+}
 
 module.exports = calculateMean;
diff --git a/Sprint-1/implement/mean.test.js b/Sprint-1/implement/mean.test.js
index 847b88676..d4a592e2d 100644
--- a/Sprint-1/implement/mean.test.js
+++ b/Sprint-1/implement/mean.test.js
@@ -1,50 +1,31 @@
-/* Calculate the mean of an array of numbers
-
-In this kata, you will need to implement a function that calculates the mean of an array of numbers.
-
-E.g. calculateMean([1, 2, 6]), target output: 3
-E.g. calculateMean([]) throws Error("calculateMean requires a non-empty array")
-E.g. calculateMean("banana") throws Error("calculateMean requires an array of numbers")
-
-There is no mean of an empty array, and a string isn't an array of numbers, so
-calculateMean should throw rather than return a value. This is the same problem
-calculateMedian solves in the prep and in the fix directory.
-
-You should implement this function in mean.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 calculateMean = require("./mean.js");
 
-// Acceptance criteria:
-
-// Given an array of numbers
-// When passed to calculateMean
-// Then it should return their mean
-// Delete this test.todo and replace it with a test.
-test.todo("given [1, 2, 6], returns 3");
-
-// Given an array with a single number
-// When passed to calculateMean
-// Then it should return that number
-
-// Given an array containing negative or decimal numbers
-// When passed to calculateMean
-// Then it should return the correct mean
-
-// Given an empty array
-// When passed to calculateMean
-// Then it should throw Error("calculateMean requires a non-empty array")
-
-// Given a value that isn't an array, e.g. "banana", 42, null or {}
-// When passed to calculateMean
-// Then it should throw Error("calculateMean requires an array of numbers")
-
-// Given no argument at all
-// When passed to calculateMean
-// Then it should throw Error("calculateMean requires an array of numbers")
-
-// Given an array containing a non-number value, e.g. [1, "2", 3]
-// When passed to calculateMean
-// Then it should throw Error("calculateMean requires an array of numbers")
+test("given [1, 2, 6], returns 3", () => {
+  expect(calculateMean([1, 2, 6])).toBe(3);
+});
+
+test("returns the number for a single item array", () => {
+  expect(calculateMean([8])).toBe(8);
+});
+
+test("handles negative and decimal numbers", () => {
+  expect(calculateMean([-2, 4, 3.5])).toBeCloseTo(1.8333);
+});
+
+test("throws for an empty array", () => {
+  expect(() => calculateMean([])).toThrow(
+    new Error("calculateMean requires a non-empty array")
+  );
+});
+
+test("throws when not given an array", () => {
+  expect(() => calculateMean("banana")).toThrow(
+    new Error("calculateMean requires an array of numbers")
+  );
+});
+
+test("throws for an array containing a non-number", () => {
+  expect(() => calculateMean([1, "2", 3])).toThrow(
+    new Error("calculateMean requires an array of numbers")
+  );
+});
diff --git a/Sprint-1/implement/sum.js b/Sprint-1/implement/sum.js
index 9062aafe3..6b578d356 100644
--- a/Sprint-1/implement/sum.js
+++ b/Sprint-1/implement/sum.js
@@ -1,4 +1,15 @@
-function sum(elements) {
+function sum(list) {
+  if (!Array.isArray(list)) {
+    throw new Error("sum requires an array of numbers");
+  }
+  if (!list.every((item) => typeof item === "number")) {
+    throw new Error("sum requires an array of numbers");
+  }
+  let total = 0;
+  for (const item of list) {
+    total += item;
+  }
+  return total;
 }
 
 module.exports = sum;
diff --git a/Sprint-1/implement/sum.test.js b/Sprint-1/implement/sum.test.js
index a288e0f0a..55a2135ec 100644
--- a/Sprint-1/implement/sum.test.js
+++ b/Sprint-1/implement/sum.test.js
@@ -1,36 +1,27 @@
-/* Sum the numbers in an array
-
-In this kata, you will need to implement a function that sums the numerical elements of an array
-
-E.g. sum([10, 20, 30]), target output: 60
-E.g. sum(['hey', 10, 'hi', 60, 10]) throws Error("sum requires an array of numbers") (sum can't add non-numerical elements, so it shouldn't guess)
-*/
-
 const sum = require("./sum.js");
 
-// Acceptance Criteria:
-
-// 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, return that number", () => {
+  expect(sum([8])).toBe(8);
+});
 
-// Given an array containing negative numbers
-// When passed to the sum function
-// Then it should still return the correct total sum
+test("adds negative number correctly", () => {
+  expect(sum([-5, 3, -10])).toBe(-12);
+});
 
-// Given an array with decimal/float numbers
-// When passed to the sum function
-// Then it should return the correct total sum
+test("adds decimal numbers correctly", () => {
+  expect(sum([1.5, 2.25, 3])).toBe(6.75);
+});
 
-// Given an array containing a value that isn't a number
-// When passed to the sum function
-// Then it should throw Error("sum requires an array of numbers")
+test("throws for an array containing a non-number", () => {
+  expect(() => sum(["hey", 10])).toThrow("sum requires an array of numbers");
+});
 
-// Given something that isn't an array at all, such as "hey", 42 or no argument
-// When passed to the sum function
-// Then it should throw Error("sum requires an array of numbers")
+test("throws when not given an array", () => {
+  expect(() => sum("hey")).toThrow(
+    new Error("sum requires an array of numbers")
+  );
+});
diff --git a/Sprint-1/refactor/includes.js b/Sprint-1/refactor/includes.js
index 29dad81f0..8c9ae2e66 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 element of list) {
     if (element === target) {
       return true;
     }
diff --git a/Sprint-1/stretch/aoc-2018-day1/input.txt b/Sprint-1/stretch/aoc-2018-day1/input.txt
index 1ffa65fc8..67857469c 100644
--- a/Sprint-1/stretch/aoc-2018-day1/input.txt
+++ b/Sprint-1/stretch/aoc-2018-day1/input.txt
@@ -1,951 +1,1037 @@
--10
--12
-+1
-+14
-+11
--19
--4
-+10
-+10
--12
--13
--10
--8
++13
++19
 +11
-+3
--10
-+8
-+5
--14
++15
++1
 +7
-+12
-+12
++17
 +14
--1
+-16
++15
++4
+-2
+-10
++2
 +17
++18
 -5
-+9
--15
-+8
+-18
+-18
 -16
-+9
-+6
-+17
 -11
-+19
-+11
+-9
 -9
 -1
--8
--16
--5
-+6
-+2
 +6
 +12
-+15
-+16
--6
--8
--5
++14
++3
++7
 +11
++13
++10
 -9
-+19
-+19
--5
--12
--17
--20
-+9
--6
--2
-+20
-+15
--8
++16
 +15
-+19
--5
++18
+-19
 -17
--9
 +1
--9
--11
--19
--1
--15
-+18
--4
+-7
++11
 +19
-+3
-+21
-+5
--1
-+8
-+9
-+9
--16
-+17
--15
-+18
-+14
-+8
--13
 -2
--15
-+13
+-3
 +19
--13
-+5
++12
++9
++7
 +16
++1
++5
+-11
+-7
 +16
-+7
-+8
--19
 +3
--12
-+18
--16
--19
++12
 +8
--16
-+20
-+15
--5
 -17
-+15
-+14
--2
-+18
--6
-+5
-+16
-+13
 -8
+-11
++5
 -9
--1
-+13
-+18
--2
-+16
--4
-+19
-+6
-+14
--6
--16
--10
--5
--15
-+11
+-18
 +10
-+18
-+8
--2
-+15
--9
-+7
+-7
++2
++4
++4
 +10
-+9
--6
++13
++6
 +1
--17
--12
-+19
+-19
++16
 +14
 -9
--18
-+20
-+12
-+10
-+14
-+6
-+9
--18
-+4
 +15
++19
+-18
 +15
+-10
+-7
++16
 +3
-+9
--4
--19
++19
+-17
 +8
-+16
 +19
--12
--1
-+16
-+11
++14
+-17
+-15
+-18
+-16
 +13
--8
+-16
++13
++17
++17
++6
++7
++8
+-11
+-17
 +4
-+18
+-12
+-17
++20
++19
++8
 +10
--11
++9
++21
++17
++12
 +18
--8
-+19
--4
--5
--12
--3
--10
--11
--18
 -7
++19
+-8
+-19
 +3
-+14
-+18
-+2
 -7
--12
-+14
-+12
-+13
--1
-+13
--1
-+15
-+13
--1
--17
--4
-+17
+-2
 -3
++16
 +13
-+5
+-16
+-16
 -19
-+17
 +10
-+6
--15
-+11
-+16
-+11
-+20
+-19
++14
+-9
+-17
++7
++1
++2
 +19
-+5
--11
--2
--12
--6
--11
++7
+-14
++1
+-8
++3
 -14
-+5
-+10
--23
-+14
 -11
-+22
--1
++2
++19
++19
+-20
+-8
 -14
--35
--23
-+11
-+4
 +10
--6
++2
++16
++15
++8
 +19
--5
-+4
+-14
++16
+-10
++1
++14
++18
 -13
--7
-+11
--24
--17
-+9
--17
-+11
-+2
 -4
--10
--24
++12
++8
+-1
+-18
++5
++1
 +14
-+15
++7
++6
 +19
+-16
++19
++13
++5
++10
+-12
 +7
--2
-+11
--13
--8
--8
--14
++7
++20
++12
 -17
-+6
-+8
++13
++18
+-13
+-9
++12
++5
+-10
++3
++5
++16
+-7
+-1
++11
++12
 -16
++7
++13
++9
 -18
-+1
--21
--14
-+8
--2
-+20
--19
+-9
++4
+-20
 +9
--15
--6
--7
++8
++6
 +4
--3
++11
++7
 -8
-+16
-+15
--26
-+18
--22
--16
+-13
+-2
++17
+-7
 -3
--17
--18
-+4
++11
++12
++3
+-7
++5
 +5
 +3
--1
++5
 +3
-+2
+-10
++11
+-8
+-5
 +3
-+7
++19
 -5
-+20
--11
-+15
--6
--19
--24
++4
++10
 -6
--20
-+13
--4
++12
+-11
++3
++9
++10
 -18
+-19
++7
+-11
+-8
+-12
+-9
+-7
+-17
 +15
-+9
-+16
-+12
--5
+-16
+-13
+-10
+-8
 +16
-+9
--4
++18
+-10
++1
 -14
 -9
+-14
++11
 -19
+-2
+-18
 -5
--16
--16
-+5
--4
+-19
++17
++8
 +12
++12
++6
 -15
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--41
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++75921
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--18
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--12
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++6
++12
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 -18
--17
--5
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++4
++3
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--12
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 +16
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--13
--30
--27
--19
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--16
--19
--10
--18
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--5
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--6
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++20
 -16
++3
++6
++15
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--4
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--50
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--21
++20
++17
++17
++12
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++11
++13
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--2
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--11
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--9
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--17
--14
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--14
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 -4
--1
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--1
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--5
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--15
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++8
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++9
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++9
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++6
++8
++1
++9
++20
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++3
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++4
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 -11
--11
--13
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 -12
--13
--8
++10
++9
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--13
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++10
++10
 -1
++18
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 -14
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--31
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 -10
--23
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++2
++12
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--18
--9
--6
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--2
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 +15
--10
--17
--17
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++7
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++6
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++13
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++18
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--25
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--2
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++8
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 +19
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--5
--26
--8
 -16
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--1
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--160
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--43
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--19
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--26
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--9
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--22
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 -8
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--16
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--19
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--18
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++7
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--19
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++6
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 -15
++24
++11
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++10
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++14
 +7
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++17
++11
++11
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--9
 -19
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 +11
--17
--5
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--11
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++11
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++10
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++24
++6
++6
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 -19
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++7
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--2
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-+14
--7
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++22
++26
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++8
++34
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 -8
-+10
--11
--17
++28
+-1
++34
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 +3
--13
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+-6
++25
++11
 -3
-+10
++20
++9
++8
+-14
++16
 +17
+-11
++10
++4
+-10
+-6
++8
++11
++1
++2
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++2
++15
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++10
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--18
-+7
--2
--2
+-1
++3
++19
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--6
++7
++5
+-1
++11
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--20
--15
--11
--27
-+8
+-12
++16
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+-18
++12
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++10
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--1
+-8
++1
++17
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++5
++9
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+-17
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--9
--14
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++1
++14
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--4
--49
++1
++3
 -6
+-5
++1
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+-13
+-9
+-15
+-23
 -10
--7
++1
++13
++4
+-5
+-2
++9
+-1
+-10
+-15
 -4
 -9
++17
++1
 -6
--37
++15
++8
++1
 -21
--2
+-4
++3
+-18
++20
 +5
-+12
++26
 +4
--33
--4
--13
--4
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--19
--7
--16
--1
--1
++19
 +8
--14
--15
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++19
++20
+-9
 -10
--14
--22
--11
-+10
--3
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-+9
--15
+-12
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 +16
--7
--1
-+2
+-8
+-5
+-16
+-17
 +20
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--1
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+-16
++8
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++14
 -2
++15
++22
++4
 +3
++20
++2
 +3
++16
++14
+-3
++5
++12
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+-18
 +2
--20
--10
-+11
--10
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--1
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-+7
++14
++4
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++1
 +5
++6
+-4
++16
++11
+-14
++18
+-7
++14
 +1
-+4
--13
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+-19
 -3
-+2
++18
++6
++16
++7
+-9
++16
++7
++10
 -4
--3
--1
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+-4
+-12
 -15
--14
--2
--6
-+3
+-16
++7
++19
++11
++18
++7
+-12
+-12
++20
 +13
 -19
--11
+-6
+-10
++13
+-7
+-14
+-15
+-17
+-5
++14
++6
 +8
--21
--2
--23
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+-15
+-11
 -18
-+20
-+7
-+6
--28
-+7
--33
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+-16
 -16
 -18
--10
 -18
++7
++22
 +13
+-1
++10
++18
+-9
+-16
++3
+-12
+-10
++6
 +8
--14
--13
++14
+-19
 -2
-+4
--14
++13
++5
++8
++7
++5
++5
++7
++17
+-4
 -7
++5
+-16
++15
 -18
--20
--4
--5
++4
++6
++5
++14
++27
++5
+-11
+-7
+-7
++15
++7
+-17
 +8
+-14
+-3
++2
++25
++12
+-6
+-17
++7
+-8
++23
 -4
-+16
-+21
 +20
++18
++4
+-9
++3
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 -8
++40
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+-39
+-42
++13
+-48
 -14
--2
--14
--22
-+14
-+36
-+32
--28
-+1
++7
++19
 -21
-+8
++10
+-19
++1
+-11
++12
+-25
+-9
+-19
++23
++1
++22
+-3
++22
+-7
 +14
-+75784
\ No newline at end of file
+-25
++66
+-8
++104
++41
++35
++1
++11
+-48
+-38
++44
+-64
++259
+-17
++19
+-16
++12
++16
+-77039
\ No newline at end of file
diff --git a/Sprint-1/stretch/aoc-2018-day1/solution.js b/Sprint-1/stretch/aoc-2018-day1/solution.js
index e69de29bb..fe4019862 100644
--- a/Sprint-1/stretch/aoc-2018-day1/solution.js
+++ b/Sprint-1/stretch/aoc-2018-day1/solution.js
@@ -0,0 +1,16 @@
+const fs = require("fs");
+const changes = fs.readFileSync("input.txt", "utf8").trim().split("\n").map(Number);
+
+let frequency = 0;
+
+const seen = new Set([0]);
+
+for (i = 0; ;i++) {
+    frequency += changes[i % changes.length];
+  
+  if (seen.has(frequency)) {
+    console.log(frequency);
+    break;
+}
+    seen.add(frequency)
+}