From a119c22962024ecefd5eead5fbd7a5111bf5bd84 Mon Sep 17 00:00:00 2001 From: shafiekwalker7861 Date: Thu, 16 Jul 2026 10:28:31 +0200 Subject: [PATCH 1/3] Complete Sprint 1 prep exercises and fix median implementation --- Sprint-1/fix/median.js | 28 ++++++++++++++++++++++++---- 1 file changed, 24 insertions(+), 4 deletions(-) diff --git a/Sprint-1/fix/median.js b/Sprint-1/fix/median.js index b22590bc6..c51dfe603 100644 --- a/Sprint-1/fix/median.js +++ b/Sprint-1/fix/median.js @@ -6,9 +6,29 @@ // 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 numbersOnly = list.filter( + (item) => typeof item === "number" && Number.isFinite(item) + ); + + if (numbersOnly.length === 0) { + return null; + } + + numbersOnly.sort((a, b) => a - b); + + const middleIndex = Math.floor(numbersOnly.length / 2); + + if (numbersOnly.length % 2 === 0) { + return ( + numbersOnly[middleIndex - 1] + numbersOnly[middleIndex] + ) / 2; + } + + return numbersOnly[middleIndex]; } -module.exports = calculateMedian; +module.exports = calculateMedian; \ No newline at end of file From 02ed9e1d66579b1b1c544f8b2b69ac37fc81dab6 Mon Sep 17 00:00:00 2001 From: shafiekwalker7861 Date: Thu, 16 Jul 2026 10:47:16 +0200 Subject: [PATCH 2/3] Complete Sprint 1 implement exercises --- Sprint-1/implement/dedupe.js | 6 +++++- Sprint-1/implement/dedupe.test.js | 10 +++++++++- Sprint-1/implement/max.js | 10 ++++++++++ Sprint-1/implement/max.test.js | 22 +++++++++++++++++++++- Sprint-1/implement/sum.js | 8 ++++++++ Sprint-1/implement/sum.test.js | 19 ++++++++++++++++++- 6 files changed, 71 insertions(+), 4 deletions(-) diff --git a/Sprint-1/implement/dedupe.js b/Sprint-1/implement/dedupe.js index 781e8718a..298230541 100644 --- a/Sprint-1/implement/dedupe.js +++ b/Sprint-1/implement/dedupe.js @@ -1 +1,5 @@ -function dedupe() {} +function dedupe(array) { + return [...new Set(array)]; +} + +module.exports = dedupe; diff --git a/Sprint-1/implement/dedupe.test.js b/Sprint-1/implement/dedupe.test.js index d7c8e3d8e..2b26c174a 100644 --- a/Sprint-1/implement/dedupe.test.js +++ b/Sprint-1/implement/dedupe.test.js @@ -16,13 +16,21 @@ 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"); +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 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("removes duplicate numbers while preserving the first occurrence", () => { + expect(dedupe([5, 1, 1, 2, 3, 2, 5, 8])).toEqual([5, 1, 2, 3, 8]); +}); \ No newline at end of file diff --git a/Sprint-1/implement/max.js b/Sprint-1/implement/max.js index 6dd76378e..e3a8c7fc9 100644 --- a/Sprint-1/implement/max.js +++ b/Sprint-1/implement/max.js @@ -1,4 +1,14 @@ function findMax(elements) { + let max = -Infinity; + for (let i = 0; i < elements.length; i++) { + const element = elements[i]; + if (typeof element === "number" && !isNaN(element)) { + if (element > max) { + max = element; + } + } + } + return max; } module.exports = findMax; diff --git a/Sprint-1/implement/max.test.js b/Sprint-1/implement/max.test.js index 82f18fd88..17a2f05a9 100644 --- a/Sprint-1/implement/max.test.js +++ b/Sprint-1/implement/max.test.js @@ -16,28 +16,48 @@ 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([42])).toEqual(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 both positive and negative numbers, returns the largest", () => { + expect(findMax([-10, 5, -3, 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 just negative numbers, returns the closest to zero", () => { + expect(findMax([-10, -5, -3, -8])).toEqual(-3); +}); // 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", () => { + expect(findMax([1.5, 2.3, 1.8, 2.1])).toEqual(2.3); +}); // 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, returns the largest number", () => { + expect(findMax(['hey', 10, 'hi', 60, 10])).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 with only non-number values, returns -Infinity", () => { + expect(findMax(['hello', 'world'])).toEqual(-Infinity); +}); diff --git a/Sprint-1/implement/sum.js b/Sprint-1/implement/sum.js index 9062aafe3..3f6a0356a 100644 --- a/Sprint-1/implement/sum.js +++ b/Sprint-1/implement/sum.js @@ -1,4 +1,12 @@ function sum(elements) { + let total = 0; + for (let i = 0; i < elements.length; i++) { + const element = elements[i]; + if (typeof element === "number" && !isNaN(element)) { + total += element; + } + } + return total; } module.exports = sum; diff --git a/Sprint-1/implement/sum.test.js b/Sprint-1/implement/sum.test.js index dd0a090ca..a9b209876 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([])).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([42])).toEqual(42); +}); // 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, 5, -3, 8])).toEqual(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/float numbers, returns the correct total sum", () => { + expect(sum([1.5, 2.3, 1.8, 2.1])).toBeCloseTo(7.7); +}); // 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, returns the sum of the numerical elements", () => { + expect(sum(['hey', 10, 'hi', 60, 10])).toEqual(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'])).toEqual(0); +}); From bab987bbe0593cac6bb8aeca324bc866d66ffedd Mon Sep 17 00:00:00 2001 From: shafiekwalker7861 Date: Thu, 16 Jul 2026 12:56:17 +0200 Subject: [PATCH 3/3] Complete Sprint 1 fix, implement and refactor exercises --- Sprint-1/refactor/includes.js | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/Sprint-1/refactor/includes.js b/Sprint-1/refactor/includes.js index 29dad81f0..d52bcdf43 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; } @@ -11,3 +10,5 @@ function includes(list, target) { } module.exports = includes; + +