diff --git a/Sprint-1/fix/median.js b/Sprint-1/fix/median.js index b22590bc6..2439c661d 100644 --- a/Sprint-1/fix/median.js +++ b/Sprint-1/fix/median.js @@ -6,9 +6,22 @@ // 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 numericValues = list.filter( + (val) => typeof val === "number" && !isNaN(val) + ); + if (numericValues.length === 0) { + return null; + } + const sorted = [...numericValues].sort((a, b) => a - b); + const middleIndex = Math.floor(sorted.length / 2); + if (sorted.length % 2 === 0) { + return (sorted[middleIndex - 1] + sorted[middleIndex]) / 2; + } else { + return sorted[middleIndex]; + } } 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 781e8718a..b50144c3d 100644 --- a/Sprint-1/implement/dedupe.js +++ b/Sprint-1/implement/dedupe.js @@ -1 +1,15 @@ -function dedupe() {} +function dedupe(arr) { + if (!Array.isArray(arr)) { + return []; + } + const seen = new Set(); + return arr.filter((item) => { + if (seen.has(item)) { + return false; + } + seen.add(item); + return true; + }); +} + +module.exports = dedupe; diff --git a/Sprint-1/implement/dedupe.test.js b/Sprint-1/implement/dedupe.test.js index 23e0f8638..6ec4e915d 100644 --- a/Sprint-1/implement/dedupe.test.js +++ b/Sprint-1/implement/dedupe.test.js @@ -12,16 +12,27 @@ E.g. dedupe([1, 2, 1]) target output: [1, 2] */ // Acceptance Criteria: +describe("dedupe", () => { + // Given an empty array + // When passed to the dedupe function + // Then it should return an empty array + it("given an empty array, it returns an empty array", () => { + expect(dedupe([])).toEqual([]); + }); -// 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 with strings or numbers -// When passed to the dedupe function -// Then it should remove the duplicate values, preserving the first occurence of each element + // Given an array with no duplicates + // When passed to the dedupe function + // Then it should return a copy of the original array + it("given an array with no duplicates, returns a copy of the original array", () => { + expect(dedupe([1, 2, 3])).toEqual([1, 2, 3]); + expect(dedupe(["a", "b", "c"])).toEqual(["a", "b", "c"]); + }); + // 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 + it("given an array with strings or numbers, removes duplicates preserving the first occurrence", () => { + expect(dedupe(["a", "a", "a", "b", "b", "c"])).toEqual(["a", "b", "c"]); + expect(dedupe([5, 1, 1, 2, 3, 2, 5, 8])).toEqual([5, 1, 2, 3, 8]); + expect(dedupe([1, 2, 1])).toEqual([1, 2]); + }); +}); diff --git a/Sprint-1/implement/max.js b/Sprint-1/implement/max.js index 6dd76378e..32247b700 100644 --- a/Sprint-1/implement/max.js +++ b/Sprint-1/implement/max.js @@ -1,4 +1,17 @@ function findMax(elements) { + if (!Array.isArray(elements)) { + return -Infinity; + } + + const numericValues = elements.filter( + (val) => typeof val === "number" && !isNaN(val) + ); + + if (numericValues.length === 0) { + return -Infinity; + } + + return Math.max(...numericValues); } module.exports = findMax; diff --git a/Sprint-1/implement/max.test.js b/Sprint-1/implement/max.test.js index 82f18fd88..8aa0a552e 100644 --- a/Sprint-1/implement/max.test.js +++ b/Sprint-1/implement/max.test.js @@ -16,28 +16,42 @@ 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"); - +it("given an empty array, returns -Infinity", () => { + expect(findMax([])).toBe(-Infinity); +}); // Given an array with one number // When passed to the max function // Then it should return that number - +it("given an array with one number, returns that number", () => { + expect(findMax([42])).toBe(42); +}); // Given an array with both positive and negative numbers // When passed to the max function // Then it should return the largest number overall - +it("given an array with both positive and negative numbers, returns the largest number", () => { + expect(findMax([-10, 0, 5, 20, -3])).toBe(20); +}); // Given an array with just negative numbers // When passed to the max function // Then it should return the closest one to zero - +it("given an array with only negative numbers, returns the closest to zero", () => { + expect(findMax([-10, -3, -20])).toBe(-3); +}); // Given an array with decimal numbers // When passed to the max function // Then it should return the largest decimal number - +it("given an array with decimal numbers, returns the largest decimal", () => { + expect(findMax([1.1, 2.5, 2.49])).toBe(2.5); +}); // 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("given an array with non-number values, returns the max and ignores non-numeric values", () => { + expect(findMax(["hey", 10, "hi", 60, 10])).toBe(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 +it("given an array with only non-number values, returns -Infinity", () => { + expect(findMax(["apple", "banana", null, undefined])).toBe(-Infinity); +}); diff --git a/Sprint-1/implement/sum.js b/Sprint-1/implement/sum.js index 9062aafe3..b2e295c82 100644 --- a/Sprint-1/implement/sum.js +++ b/Sprint-1/implement/sum.js @@ -1,4 +1,9 @@ function sum(elements) { + if (!Array.isArray(elements)) return 0; + + return elements + .filter((val) => typeof val === "number" && !isNaN(val)) + .reduce((acc, val) => acc + val, 0); } module.exports = sum; diff --git a/Sprint-1/implement/sum.test.js b/Sprint-1/implement/sum.test.js index dd0a090ca..aba0996d4 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") +it("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 - +it("given an array with one number, returns that number", () => { + expect(sum([42])).toBe(42); +}); // Given an array containing negative numbers // When passed to the sum function // Then it should still return the correct total sum - +it("given an array with negative numbers, returns the correct sum", () => { + expect(sum([-10, 5, -3, 8])).toBe(0); +}); // Given an array with decimal/float numbers // When passed to the sum function // Then it should return the correct total sum - +it("given an array with decimal numbers, returns the correct sum", () => { + expect(sum([1.1, 2.5, 3.4])).toBeCloseTo(7.0); // use toBeCloseTo for floating point +}); // 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("given an array with non-number values, sums only the numbers", () => { + expect(sum(["hey", 10, "hi", 60, 10])).toBe(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 +it("given an array with only non-number values, returns 0", () => { + expect(sum(["apple", "banana", null, undefined])).toBe(0); +}); diff --git a/Sprint-1/package-lock.json b/Sprint-1/package-lock.json index 83e427d0b..c6a2eb5d1 100644 --- a/Sprint-1/package-lock.json +++ b/Sprint-1/package-lock.json @@ -27,14 +27,15 @@ } }, "node_modules/@babel/code-frame": { - 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"version": "1.1.0", - "resolved": "https://registry.npmjs.org/picocolors/-/picocolors-1.1.0.tgz", - "integrity": "sha512-TQ92mBOW0l3LeMeyLV6mzy/kWr8lkd/hp3mTg7wYK7zJhuBStmGMBG0BdeDZS/dZx1IukaX6Bk11zcln25o1Aw==", + "version": "1.1.1", + "resolved": "https://registry.npmjs.org/picocolors/-/picocolors-1.1.1.tgz", + "integrity": "sha512-xceH2snhtb5M9liqDsmEw56le376mTZkEX/jEb/RxNFyegNul7eNslCXP9FDj/Lcu0X8KEyMceP2ntpaHrDEVA==", "dev": true, "license": "ISC" }, @@ -3543,16 +3451,6 @@ "dev": true, "license": "BSD-3-Clause" }, - "node_modules/to-fast-properties": { - "version": "2.0.0", - "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz", - "integrity": "sha512-/OaKK0xYrs3DmxRYqL/yDc+FxFUVYhDlXMhRmv3z915w2HF1tnN1omB354j8VUGO/hbRzyD6Y3sA7v7GS/ceog==", - "dev": true, - "license": "MIT", - "engines": { - "node": ">=4" - } - }, "node_modules/to-regex-range": { "version": "5.0.1", "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz", 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; }