Birmingham| 26-ITP-May | Gabriel Pawuoi| Sprint 3 | coursework

Sprint-3/1-implement-and-rewrite-tests/implement/1-get-angle-type.js

@@ -15,7 +15,12 @@
 // execute the code to ensure all tests pass.
 
 function getAngleType(angle) {
-  // TODO: Implement this function
+  if (angle <= 0 || angle >= 360) return "Invalid angle";
+  if (angle === 90) return "Right angle";
+  if (angle === 180) return "Straight angle";
+  if (angle < 90) return "Acute angle";
+  if (angle < 180) return "Obtuse angle";
+  return "Reflex angle";
 }
 
 // The line below allows us to load the getAngleType function into tests in other files.
@@ -31,7 +36,25 @@ function assertEquals(actualOutput, targetOutput) {
   );
 }
 
-// TODO: Write tests to cover all cases, including boundary and invalid cases.
-// Example: Identify Right Angles
+// Tests covering all cases
 const right = getAngleType(90);
 assertEquals(right, "Right angle");
+
+assertEquals(getAngleType(45), "Acute angle");
+assertEquals(getAngleType(1), "Acute angle");
+assertEquals(getAngleType(89), "Acute angle");
+
+assertEquals(getAngleType(91), "Obtuse angle");
+assertEquals(getAngleType(135), "Obtuse angle");
+assertEquals(getAngleType(179), "Obtuse angle");
+
+assertEquals(getAngleType(180), "Straight angle");
+
+assertEquals(getAngleType(181), "Reflex angle");
+assertEquals(getAngleType(270), "Reflex angle");
+assertEquals(getAngleType(359), "Reflex angle");
+
+assertEquals(getAngleType(0), "Invalid angle");
+assertEquals(getAngleType(360), "Invalid angle");
+assertEquals(getAngleType(-10), "Invalid angle");
+assertEquals(getAngleType(400), "Invalid angle");

Sprint-3/1-implement-and-rewrite-tests/implement/2-is-proper-fraction.js

@@ -4,30 +4,27 @@
 
 // Assumption: The parameters are valid numbers (not NaN or Infinity).
 
-// Note: If you are unfamiliar with proper fractions, please look up its mathematical definition.
-
-// Acceptance criteria:
-// After you have implemented the function, write tests to cover all the cases, and
-// execute the code to ensure all tests pass.
+// Note: A proper fraction is one where the absolute value of the numerator
+// is strictly less than the absolute value of the denominator.
 
 function isProperFraction(numerator, denominator) {
-  // TODO: Implement this function
+  if (denominator === 0) return false;
+  return Math.abs(numerator) < Math.abs(denominator);
 }
 
-// The line below allows us to load the isProperFraction function into tests in other files.
-// This will be useful in the "rewrite tests with jest" step.
 module.exports = isProperFraction;
 
-// Here's our helper again
 function assertEquals(actualOutput, targetOutput) {
   console.assert(
     actualOutput === targetOutput,
     `Expected ${actualOutput} to equal ${targetOutput}`
   );
 }
 
-// TODO: Write tests to cover all cases.
-// What combinations of numerators and denominators should you test?
-
-// Example: 1/2 is a proper fraction
+// Tests covering all cases
 assertEquals(isProperFraction(1, 2), true);
+assertEquals(isProperFraction(2, 1), false);   // numerator > denominator
+assertEquals(isProperFraction(3, 3), false);   // equal -> not proper
+assertEquals(isProperFraction(-1, 2), true);   // negative numerator
+assertEquals(isProperFraction(1, -2), true);   // negative denominator
+assertEquals(isProperFraction(1, 0), false);   // zero denominator

Sprint-3/1-implement-and-rewrite-tests/implement/3-get-card-value.js

@@ -22,7 +22,17 @@
 // execute the code to ensure all tests pass.
 
 function getCardValue(card) {
-  // TODO: Implement this function
+  const suit = card.slice(-1);
+  const rank = card.slice(0, -1);
+  const validSuits = ["\u2660", "\u2665", "\u2666", "\u2663"];
+  const validRanks = ["A", "2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K"];
+
+  if (!validSuits.includes(suit) || !validRanks.includes(rank)) {
+    throw new Error(`Invalid card: ${card}`);
+  }
+  if (rank === "A") return 11;
+  if (["J", "Q", "K"].includes(rank)) return 10;
+  return Number(rank);
 }
 
 // The line below allows us to load the getCardValue function into tests in other files.
@@ -40,6 +50,13 @@ function assertEquals(actualOutput, targetOutput) {
 // TODO: Write tests to cover all outcomes, including throwing errors for invalid cards.
 // Examples:
 assertEquals(getCardValue("9♠"), 9);
+assertEquals(getCardValue("A♠"), 11);
+assertEquals(getCardValue("A♥"), 11);
+assertEquals(getCardValue("2♦"), 2);
+assertEquals(getCardValue("10♥"), 10);
+assertEquals(getCardValue("J♣"), 10);
+assertEquals(getCardValue("Q♦"), 10);
+assertEquals(getCardValue("K♦"), 10);
 
 // Handling invalid cards
 try {

Sprint-3/1-implement-and-rewrite-tests/rewrite-tests-with-jest/1-get-angle-type.test.js

@@ -1,20 +1,34 @@
-// This statement loads the getAngleType function you wrote in the implement directory.
-// We will use the same function, but write tests for it using Jest in this file.
 const getAngleType = require("../implement/1-get-angle-type");
 
-// TODO: Write tests in Jest syntax to cover all cases/outcomes,
-// including boundary and invalid cases.
-
-// Case 1: Acute angles
 test(`should return "Acute angle" when (0 < angle < 90)`, () => {
-  // Test various acute angles, including boundary cases
   expect(getAngleType(1)).toEqual("Acute angle");
   expect(getAngleType(45)).toEqual("Acute angle");
   expect(getAngleType(89)).toEqual("Acute angle");
 });
 
-// Case 2: Right angle
-// Case 3: Obtuse angles
-// Case 4: Straight angle
-// Case 5: Reflex angles
-// Case 6: Invalid angles
+test(`should return "Right angle" for exactly 90`, () => {
+  expect(getAngleType(90)).toEqual("Right angle");
+});
+
+test(`should return "Obtuse angle" when (90 < angle < 180)`, () => {
+  expect(getAngleType(91)).toEqual("Obtuse angle");
+  expect(getAngleType(135)).toEqual("Obtuse angle");
+  expect(getAngleType(179)).toEqual("Obtuse angle");
+});
+
+test(`should return "Straight angle" for exactly 180`, () => {
+  expect(getAngleType(180)).toEqual("Straight angle");
+});
+
+test(`should return "Reflex angle" when (180 < angle < 360)`, () => {
+  expect(getAngleType(181)).toEqual("Reflex angle");
+  expect(getAngleType(270)).toEqual("Reflex angle");
+  expect(getAngleType(359)).toEqual("Reflex angle");
+});
+
+test(`should return "Invalid angle" for angles outside 0-360`, () => {
+  expect(getAngleType(0)).toEqual("Invalid angle");
+  expect(getAngleType(360)).toEqual("Invalid angle");
+  expect(getAngleType(-10)).toEqual("Invalid angle");
+  expect(getAngleType(400)).toEqual("Invalid angle");
+});

Sprint-3/1-implement-and-rewrite-tests/rewrite-tests-with-jest/2-is-proper-fraction.test.js

@@ -1,10 +1,25 @@
-// This statement loads the isProperFraction function you wrote in the implement directory.
-// We will use the same function, but write tests for it using Jest in this file.
 const isProperFraction = require("../implement/2-is-proper-fraction");
 
-// TODO: Write tests in Jest syntax to cover all combinations of positives, negatives, zeros, and other categories.
-
-// Special case: numerator is zero
 test(`should return false when denominator is zero`, () => {
   expect(isProperFraction(1, 0)).toEqual(false);
 });
+
+test(`should return true when numerator < denominator (positive)`, () => {
+  expect(isProperFraction(1, 2)).toEqual(true);
+  expect(isProperFraction(3, 7)).toEqual(true);
+});
+
+test(`should return false when numerator >= denominator (positive)`, () => {
+  expect(isProperFraction(2, 1)).toEqual(false);
+  expect(isProperFraction(3, 3)).toEqual(false);
+});
+
+test(`should handle negative numerator`, () => {
+  expect(isProperFraction(-1, 2)).toEqual(true);
+  expect(isProperFraction(-3, 2)).toEqual(false);
+});
+
+test(`should handle negative denominator`, () => {
+  expect(isProperFraction(1, -2)).toEqual(true);
+  expect(isProperFraction(3, -2)).toEqual(false);
+});

Sprint-3/1-implement-and-rewrite-tests/rewrite-tests-with-jest/3-get-card-value.test.js

@@ -1,20 +1,24 @@
-// This statement loads the getCardValue function you wrote in the implement directory.
-// We will use the same function, but write tests for it using Jest in this file.
 const getCardValue = require("../implement/3-get-card-value");
 
-// TODO: Write tests in Jest syntax to cover all possible outcomes.
-
-// Case 1: Ace (A)
 test(`Should return 11 when given an ace card`, () => {
   expect(getCardValue("A♠")).toEqual(11);
+  expect(getCardValue("A♥")).toEqual(11);
 });
 
-// Suggestion: Group the remaining test data into these categories:
-//   Number Cards (2-10)
-//   Face Cards (J, Q, K)
-//   Invalid Cards
+test(`Should return numeric value for number cards 2-10`, () => {
+  expect(getCardValue("2♥")).toEqual(2);
+  expect(getCardValue("5♦")).toEqual(5);
+  expect(getCardValue("10♥")).toEqual(10);
+});
 
-// To learn how to test whether a function throws an error as expected in Jest,
-// please refer to the Jest documentation:
-// https://jestjs.io/docs/expect#tothrowerror
+test(`Should return 10 for face cards J, Q, K`, () => {
+  expect(getCardValue("J♣")).toEqual(10);
+  expect(getCardValue("Q♦")).toEqual(10);
+  expect(getCardValue("K♠")).toEqual(10);
+});
 
+test(`Should throw an error for invalid cards`, () => {
+  expect(() => getCardValue("invalid")).toThrow();
+  expect(() => getCardValue("1♠")).toThrow();
+  expect(() => getCardValue("")).toThrow();
+});

Sprint-3/2-practice-tdd/count.js

@@ -1,5 +1,9 @@
 function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  let count = 0;
+  for (const char of stringOfCharacters) {
+    if (char === findCharacter) count++;
+  }
+  return count;
 }
 
 module.exports = countChar;

Sprint-3/2-practice-tdd/count.test.js

@@ -17,8 +17,6 @@ test("should count multiple occurrences of a character", () => {
   expect(count).toEqual(5);
 });
 
-// Scenario: No Occurrences
-// Given the input string `str`,
-// And a character `char` that does not exist within `str`.
-// When the function is called with these inputs,
-// Then it should return 0, indicating that no occurrences of `char` were found.
+test("should return 0 when character does not occur", () => {
+  expect(countChar("hello", "z")).toEqual(0);
+});

Sprint-3/2-practice-tdd/get-ordinal-number.js

@@ -1,5 +1,11 @@
 function getOrdinalNumber(num) {
-  return "1st";
+  const lastTwo = num % 100;
+  const lastOne = num % 10;
+  if (lastTwo >= 11 && lastTwo <= 13) return `${num}th`;
+  if (lastOne === 1) return `${num}st`;
+  if (lastOne === 2) return `${num}nd`;
+  if (lastOne === 3) return `${num}rd`;
+  return `${num}th`;
 }
 
 module.exports = getOrdinalNumber;

Sprint-3/2-practice-tdd/get-ordinal-number.test.js

@@ -18,3 +18,22 @@ test("should append 'st' for numbers ending with 1, except those ending with 11"
   expect(getOrdinalNumber(21)).toEqual("21st");
   expect(getOrdinalNumber(131)).toEqual("131st");
 });
+
+test("should append 'nd' for numbers ending with 2, except those ending with 12", () => {
+  expect(getOrdinalNumber(2)).toEqual("2nd");
+  expect(getOrdinalNumber(22)).toEqual("22nd");
+  expect(getOrdinalNumber(12)).toEqual("12th");
+});
+
+test("should append 'rd' for numbers ending with 3, except those ending with 13", () => {
+  expect(getOrdinalNumber(3)).toEqual("3rd");
+  expect(getOrdinalNumber(23)).toEqual("23rd");
+  expect(getOrdinalNumber(13)).toEqual("13th");
+});
+
+test("should append 'th' for all other numbers including 11, 12, 13", () => {
+  expect(getOrdinalNumber(4)).toEqual("4th");
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(112)).toEqual("112th");
+  expect(getOrdinalNumber(20)).toEqual("20th");
+});

Sprint-3/2-practice-tdd/repeat-str.js

@@ -1,7 +1,8 @@
-function repeatStr() {
-  // Your implementation of this function must *not* call String.prototype.repeat (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/repeat).
-  // The goal is to re-implement that function, not to use it.
-  return "hellohellohello";
+function repeatStr(str, count) {
+  if (count < 0) throw new Error("count must be non-negative");
+  let result = "";
+  for (let i = 0; i < count; i++) result += str;
+  return result;
 }
 
 module.exports = repeatStr;

Sprint-3/2-practice-tdd/repeat-str.test.js

@@ -16,17 +16,14 @@ test("should repeat the string count times", () => {
   expect(repeatedStr).toEqual("hellohellohello");
 });
 
-// Case: handle count of 1:
-// Given a target string `str` and a `count` equal to 1,
-// When the repeatStr function is called with these inputs,
-// Then it should return the original `str` without repetition.
+test("should return the original string when count is 1", () => {
+  expect(repeatStr("hello", 1)).toEqual("hello");
+});
 
-// Case: Handle count of 0:
-// Given a target string `str` and a `count` equal to 0,
-// When the repeatStr function is called with these inputs,
-// Then it should return an empty string.
+test("should return empty string when count is 0", () => {
+  expect(repeatStr("hello", 0)).toEqual("");
+});
 
-// Case: Handle negative count:
-// Given a target string `str` and a negative integer `count`,
-// When the repeatStr function is called with these inputs,
-// Then it should throw an error, as negative counts are not valid.
+test("should throw an error when count is negative", () => {
+  expect(() => repeatStr("hello", -1)).toThrow();
+});

Sprint-3/3-dead-code/exercise-1.js

@@ -1,13 +1,8 @@
-// Find the instances of unreachable and redundant code - remove them!
-// The sayHello function should continue to work for any reasonable input it's given.
-
 let testName = "Jerry";
 const greeting = "hello";
 
 function sayHello(greeting, name) {
-  const greetingStr = greeting + ", " + name + "!";
   return `${greeting}, ${name}!`;
-  console.log(greetingStr);
 }
 
 testName = "Aman";

Sprint-3/3-dead-code/exercise-2.js

@@ -2,12 +2,6 @@
 // The countAndCapitalisePets function should continue to work for any reasonable input it's given, and you shouldn't modify the pets variable.
 
 const pets = ["parrot", "hamster", "horse", "dog", "hamster", "cat", "hamster"];
-const capitalisedPets = pets.map((pet) => pet.toUpperCase());
-const petsStartingWithH = pets.filter((pet) => pet[0] === "h");
-
-function logPets(petsArr) {
-  petsArr.forEach((pet) => console.log(pet));
-}
 
 function countAndCapitalisePets(petsArr) {
   const petCount = {};
@@ -23,6 +17,7 @@ function countAndCapitalisePets(petsArr) {
   return petCount;
 }
 
+const petsStartingWithH = pets.filter((pet) => pet[0] === "h");
 const countedPetsStartingWithH = countAndCapitalisePets(petsStartingWithH);
 
 console.log(countedPetsStartingWithH); // { 'HAMSTER': 3, 'HORSE': 1 } <- Final console log

Sprint-3/4-stretch/card-validator.js

@@ -0,0 +1,26 @@
+// Validates a credit card number string against the following rules:
+// - Must be exactly 16 digits (no letters or other characters)
+// - Must contain at least two different digits
+// - The final digit must be even
+// - The sum of all digits must be greater than 16
+
+function isValidCardNumber(cardNumber) {
+  // Rule 1: must be exactly 16 digit characters
+  if (!/^\d{16}$/.test(cardNumber)) return false;
+
+  const digits = cardNumber.split("").map(Number);
+
+  // Rule 2: at least two different digits must be present
+  if (new Set(digits).size < 2) return false;
+
+  // Rule 3: final digit must be even
+  if (digits[15] % 2 !== 0) return false;
+
+  // Rule 4: sum of all digits must be greater than 16
+  const sum = digits.reduce((acc, d) => acc + d, 0);
+  if (sum <= 16) return false;
+
+  return true;
+}
+
+module.exports = isValidCardNumber;