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b/package.json index 355f4cf8..e80bac2a 100644 --- a/package.json +++ b/package.json @@ -19,7 +19,8 @@ "@testing-library/jest-dom": "^5.16.5", "@testing-library/user-event": "^13.5.0", "jest": "^29.2.2", - "jest-environment-jsdom": "^29.2.2" + "jest-environment-jsdom": "^29.2.2", + "test": "^3.3.0" }, "jest": { "setupFilesAfterEnv": [ diff --git a/week-2/debug/address.js b/week-2/debug/address.js index 940a6af8..508b9e07 100644 --- a/week-2/debug/address.js +++ b/week-2/debug/address.js @@ -1,4 +1,6 @@ // Predict and explain first... +//Answer:We can not access object with index instead we access them with the key, that is why we mutilate it by using the ".", +//and then the key to get access to the house number. // This code should log out the houseNumber from the address object // but it isn't working... @@ -12,4 +14,4 @@ const address = { postcode: "XYZ 123", }; -console.log(`My house number is ${address[0]}`); +console.log(`My house number is ${address.houseNumber}`); diff --git a/week-2/debug/author.js b/week-2/debug/author.js index 8c212597..025e7b48 100644 --- a/week-2/debug/author.js +++ b/week-2/debug/author.js @@ -1,5 +1,8 @@ // Predict and explain first... - +/**Answer: + * Javascript doesn't allow you to iterate over object value, + * objects don't have the natural sequence that arrays do + */ // This program attempts to log out all the property values in the object. // But it isn't working. Explain why first and then fix the problem @@ -11,6 +14,6 @@ const author = { alive: true, }; -for (const value of author) { +for (const value of Object.values(author)) { console.log(value); } diff --git a/week-2/debug/recipe.js b/week-2/debug/recipe.js index 6cbdd22c..58232eb2 100644 --- a/week-2/debug/recipe.js +++ b/week-2/debug/recipe.js @@ -11,5 +11,5 @@ const recipe = { }; console.log(`${recipe.title} serves ${recipe.serves} - ingredients: + ingredients:\n${recipe.ingredients.join("\n")} ${recipe}`); diff --git a/week-2/implement/contains.js b/week-2/implement/contains.js index cd779308..ea8fe59b 100644 --- a/week-2/implement/contains.js +++ b/week-2/implement/contains.js @@ -1,3 +1,11 @@ -function contains() {} +function contains(object, key) { + if (typeof object !== "object" || object === null) { + throw new TypeError("Invalid input: object must be a non-null object."); + } + return object.hasOwnProperty(key); +} +console.log(contains({ a: 1, b: 2 }, "a")); +console.log(contains({ a: 1, b: 2 }, "c")); +console.log(contains({}, "a")); module.exports = contains; diff --git a/week-2/implement/contains.test.js b/week-2/implement/contains.test.js index e75984b8..38957c17 100644 --- a/week-2/implement/contains.test.js +++ b/week-2/implement/contains.test.js @@ -32,3 +32,29 @@ as the object doesn't contains a key of 'c' // Given invalid parameters like arrays // When passed to contains // Then it should return false or throw an error + +describe("contains()", () => { + test("Given an object with the property, it should return true", () => { + expect(contains({ a: 1, b: 2 }, "a")).toBe(true); + }); + + test("Given an object without the property, it should return false", () => { + expect(contains({ a: 1, b: 2 }, "c")).toBe(false); + }); + + test("Given an empty object, it should return false", () => { + expect(contains({}, "a")).toBe(false); + }); + + test("Given null, it should throw an error", () => { + expect(() => contains(null, "a")).toThrow( + "Invalid input: object must be a non-null object." + ); + }); + + test("Given a non-object input, it should throw an error", () => { + expect(() => contains(42, "a")).toThrow( + "Invalid input: object must be a non-null object." + ); + }); +}); diff --git a/week-2/implement/lookup.js b/week-2/implement/lookup.js index 7a239939..e2721ba2 100644 --- a/week-2/implement/lookup.js +++ b/week-2/implement/lookup.js @@ -1,3 +1,16 @@ -function createLookup() { +function createLookup(countryCurrencyPairs) { // implementation here + const lookup = {}; + for (const pair of countryCurrencyPairs) { + const [countryCodes, currencyCodes] = pair; + lookup[countryCodes] = currencyCodes; + } + return lookup; } +const countryCurrencyPairs = [ + ["US", "USD"], + ["CA", "CAD"], +]; +console.log(createLookup(countryCurrencyPairs)); + +module.exports = createLookup; diff --git a/week-2/implement/lookup.test.js b/week-2/implement/lookup.test.js index 5f64d569..6b70eee6 100644 --- a/week-2/implement/lookup.test.js +++ b/week-2/implement/lookup.test.js @@ -1,4 +1,5 @@ // ======= Test suite is provided below... ======= +const createLookup = require("./lookup"); test("converts a single pair of currency codes", () => { expect(createLookup([["GB", "GBP"]])).toEqual({ diff --git a/week-2/implement/tally.js b/week-2/implement/tally.js index e69de29b..348f964e 100644 --- a/week-2/implement/tally.js +++ b/week-2/implement/tally.js @@ -0,0 +1,20 @@ +function tally(items) { + if (!Array.isArray(items)) { + throw new Error("Invalid input,input must be an array"); + } + const result = {}; + for (const item of items) { + if (result[item]) { + result[item]++; + } else { + result[item] = 1; + } + } + return result; +} +console.log(tally(["a"])); +console.log(tally(["a", "a", "a"])); +console.log(tally(["a", "a", "b", "c"])); +console.log(tally([])); + +module.exports = tally; diff --git a/week-2/implement/tally.test.js b/week-2/implement/tally.test.js index b473b750..9f186bc9 100644 --- a/week-2/implement/tally.test.js +++ b/week-2/implement/tally.test.js @@ -29,3 +29,22 @@ // Given an invalid input like a string // When passed to tally // Then it should throw an error + +const tally = require("./tally"); + +test("tallies a single item in an array", () => { + expect(tally(["a"])).toEqual({ a: 1 }); +}); +test("tallies an array with duplicate items", () => { + expect(tally(["a", "a", "a"])).toEqual({ a: 3 }); +}); +test("Given an empty array,it should return an empty object", () => { + expect(tally([])).toEqual({}); +}); +test("Given an invalid input,it should throw an error", () => { + expect(() => tally("invalid")).toThrow( + "Invalid input,input must be an array" + ); + expect(() => tally(123)).toThrow("Invalid input,input must be an array"); + expect(() => tally(null)).toThrow("Invalid input,input must be an array"); +}); diff --git a/week-2/interpret/invert.js b/week-2/interpret/invert.js index 00d27025..fa6b04f3 100644 --- a/week-2/interpret/invert.js +++ b/week-2/interpret/invert.js @@ -10,18 +10,31 @@ function invert(obj) { const invertedObj = {}; for (const [key, value] of Object.entries(obj)) { - invertedObj.key = value; + invertedObj[value] = key; } return invertedObj; } +const obj = { a: 1, b: 2 }; +const entries = Object.entries(obj); +console.log(invert({ a: 1 })); + +console.log(invert({ a: 1, b: 2 })); + +console.log(invert({ x: 10, y: 20 })); +console.log(entries); // a) What is the current return value when invert is called with { a : 1 } +//Answer :key:1 // b) What is the current return value when invert is called with { a: 1, b: 2 } +//Answer : key:2 // c) What is the target return value when invert is called with {a : 1, b: 2} +//Answer :{ '1': 'a' } // c) What does Object.entries return? Why is it needed in this program? +//Answer:It returns an array of the keys and values, when it is needed // d) Explain why the current return value is different from the target output +//Answer:It is different because invertedObj.key = value; this doesn't create a property with the actual value of key from the object. Instead, it literally sets a property named "key" in invertedObj. diff --git a/week-2/stretch/count-words.js b/week-2/stretch/count-words.js index 43c04c4e..4e4f2505 100644 --- a/week-2/stretch/count-words.js +++ b/week-2/stretch/count-words.js @@ -1,3 +1,18 @@ +function countWords(str) { + const wordCount = {}; + const words = str.split(""); + + for (const word of words) { + if (wordCount[word]) { + wordCount[word]++; + } else { + wordCount[word] = 1; + } + } + return wordCount; +} +console.log(countWords("you and me and you")); + /* Count the number of times a word appears in a given string. diff --git a/week-2/stretch/mode.js b/week-2/stretch/mode.js index a3e2e2e0..1d76fde3 100644 --- a/week-2/stretch/mode.js +++ b/week-2/stretch/mode.js @@ -8,7 +8,7 @@ // refactor calculateMode by splitting up the code // into smaller functions using the stages above -function calculateMode(list) { +function trackFrequency(list) { // track frequency of each value let freqs = new Map(); @@ -17,8 +17,10 @@ function calculateMode(list) { freqs.set(num, (freqs.get(num) || 0) + 1); } - - // Find the value with the highest frequency + return freqs; +} +// Find the value with the highest frequency +function findMode(freqs) { let maxFreq = 0; let mode; for (let [num, freq] of freqs) { @@ -27,8 +29,10 @@ function calculateMode(list) { maxFreq = freq; } } - return maxFreq === 0 ? NaN : mode; } - +function calculateMode(list) { + const freqs = trackFrequency(list); + return findMode(freqs); +} module.exports = calculateMode; diff --git a/week-2/stretch/till.js b/week-2/stretch/till.js index e3207f94..a8f87fb8 100644 --- a/week-2/stretch/till.js +++ b/week-2/stretch/till.js @@ -8,25 +8,33 @@ function totalTill(till) { let total = 0; for (const [coin, quantity] of Object.entries(till)) { - console.log(coin * quantity); - total += coin * quantity; + const coinValue = parseInt(coin.replace("p", ""), 10); + + if (isNaN(coinValue)) { + continue; + } + total += coinValue * quantity; } - return `£${total / 100}`; + return `£${(total / 100).toFixed(2)}`; } - const till = { "1p": 10, "5p": 6, "50p": 4, "20p": 10, }; + const totalAmount = totalTill(till); +module.exports = totalTill; // a) What is the target output when totalTill is called with the till object +//Answer:NaN // b) Why do we need to use Object.entries inside the for...of loop in this function? +//Answer:it allows us to iterate over the key and value pairs of an object in a structured way. // c) What does coin * quantity evaluate to inside the for...of loop? +//Answer: its evaluating the product of two value coin and quantity. // d) Write a test for this function to check it works and then fix the implementation of totalTill diff --git a/week-2/stretch/till.test.js b/week-2/stretch/till.test.js new file mode 100644 index 00000000..0367fe79 --- /dev/null +++ b/week-2/stretch/till.test.js @@ -0,0 +1,39 @@ +const totalTill = require("./till"); + +describe("totalTill function", () => { + test("should correctly calculate the total value of coins", () => { + const till = { + "1p": 10, + "5p": 6, + "50p": 4, + "20p": 10, + }; + + // Expected total to be: 10 * 1p + 6 * 5p + 4 * 50p + 10 * 20p = 10 + 30 + 200 + 200 = 440p = £4.40 + const result = totalTill(till); + expect(result).toBe("£4.40"); + }); + + test("should return £0.00 when no coins are present", () => { + const till = {}; + const result = totalTill(till); + expect(result).toBe("£0.00"); + }); + + test("should correctly calculate when only one coin type is present", () => { + const till = { + "2p": 5, // Expected to be:5 * 2p = 10p = £0.10 + }; + const result = totalTill(till); + expect(result).toBe("£0.10"); + }); + + test("should handle coins with higher denominations correctly", () => { + const till = { + "1p": 100, // Expected to be:100 * 1p = 100p = £1.00 + "50p": 2, // Expected to be:2 * 50p = 100p = £1.00 + }; + const result = totalTill(till); + expect(result).toBe("£2.00"); + }); +});