West Midlands | ITP-Sept-25 | Mustaf Asani | Sprint 3 | Coursework/sprint 3 implement and rewrite

Sprint-2/1-key-errors/0.js

@@ -1,13 +1,23 @@
 // Predict and explain first...
 //  =============> write your prediction here
+//we should have an error showing that str already exists so we cannot declare it again inside the function.
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
 
-function capitalise(str) {
-  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
-  return str;
-}
+//function capitalise(str) {
+//  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
+//  return str;
+//}
+
+//console.log(capitalise("cat"));
 
 // =============> write your explanation here
+//str has been passed down as a parameter so we cannot declare it again. we would need to declare a different variable name.
 // =============> write your new code here
+function capitalise(str) {
+  let capitalisedStr = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return capitalisedStr;
+}
+
+console.log(capitalise("cat"));

Sprint-2/1-key-errors/1.js

@@ -2,19 +2,21 @@
 
 // Why will an error occur when this program runs?
 // =============> write your prediction here
+//decimalNumber does not exist outside the scope of the convertToPercentage funtion so the log will throw an error saying it has not been declared.
 
 // Try playing computer with the example to work out what is going on
 
 function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
+  //const decimalNumber = 0.5;
   const percentage = `${decimalNumber * 100}%`;
 
   return percentage;
 }
 
-console.log(decimalNumber);
+console.log(convertToPercentage(0.5));
 
 // =============> write your explanation here
-
+//decimalNumber is passed as a parameter when the function is called, line 10 tries to declare it again and assign it a new fixed value. we would need to remove that line so we can use the value passed in with the function call.
+//decimalNumber only exists inside the function scope so console.log cannot access it an error will be thrown. we need to instead pass the function to console.log.
 // Finally, correct the code to fix the problem
 // =============> write your new code here

Sprint-2/1-key-errors/2.js

@@ -1,20 +1,23 @@
-
 // Predict and explain first BEFORE you run any code...
 
 // this function should square any number but instead we're going to get an error
 
 // =============> write your prediction of the error here
+//it will throw an error for use of a primitive value instead of a variable.
 
-function square(3) {
-    return num * num;
-}
+//function square(3) {
+//    return num * num;
+//}
 
-// =============> write the error message here
+// =============> write the error message here, SyntaxError: Unexpected number
 
 // =============> explain this error message here
-
+//this error message is becasue we cannot pass a direct value to a function when creating it but rather when we call it. Instead we need to give it a parameter that can then hold the value that we want to pass to the function.
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
+function square(num) {
+  return num * num;
+}
 
-
+console.log(square(3));

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

@@ -10,9 +10,17 @@
 function getAngleType(angle) {
   if (angle === 90) {
     return "Right angle";
+  } else if (angle < 90) {
+    return "Acute angle";
+  } else if (angle > 90 && angle < 180) {
+    return "Obtuse angle";
+  } else if (angle === 180) {
+    return "Straight angle";
+  } else if (angle > 180 && angle < 360) {
+    return "Reflex angle";
   }
-   // Run the tests, work out what Case 2 is testing, and implement the required code here.
-   // Then keep going for the other cases, one at a time.
+  // Run the tests, work out what Case 2 is testing, and implement the required code here.
+  // Then keep going for the other cases, one at a time.
 }
 
 // The line below allows us to load the getAngleType function into tests in other files.
@@ -51,13 +59,16 @@ assertEquals(acute, "Acute angle");
 // Then the function should return "Obtuse angle"
 const obtuse = getAngleType(120);
 // ====> write your test here, and then add a line to pass the test in the function above
-
+assertEquals(obtuse, "Obtuse angle");
 // Case 4: Identify Straight Angles:
 // When the angle is exactly 180 degrees,
 // Then the function should return "Straight angle"
 // ====> write your test here, and then add a line to pass the test in the function above
-
+const straight = getAngleType(180);
+assertEquals(straight, "Straight angle");
 // Case 5: Identify Reflex Angles:
 // When the angle is greater than 180 degrees and less than 360 degrees,
 // Then the function should return "Reflex angle"
-// ====> write your test here, and then add a line to pass the test in the function above
+// ====> write your test here, and then add a line to pass the test in the function above
+const reflex = getAngleType(270);
+assertEquals(reflex, "Reflex angle");

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

@@ -8,9 +8,18 @@
 // write one test at a time, and make it pass, build your solution up methodically
 
 function isProperFraction(numerator, denominator) {
-  if (numerator < denominator) {
+  const absNumerator = Math.abs(numerator);
+  const absDenominator = Math.abs(denominator);
+
+  if (absDenominator === 0) {
+    return `you cannot have zero as a denominator`;
+  }
+
+  if (absNumerator < absDenominator) {
     return true;
   }
+
+  return false;
 }
 
 // The line below allows us to load the isProperFraction function into tests in other files.
@@ -45,15 +54,24 @@ assertEquals(improperFraction, false);
 // Input: numerator = -4, denominator = 7
 // target output: true
 // Explanation: The fraction -4/7 is a proper fraction because the absolute value of the numerator (4) is less than the denominator (7). The function should return true.
-const negativeFraction = isProperFraction(-4, 7);
+const negativeFraction = isProperFraction(-4, -7);
 // ====> complete with your assertion
+assertEquals(negativeFraction, true);
 
 // Equal Numerator and Denominator check:
 // Input: numerator = 3, denominator = 3
 // target output: false
 // Explanation: The fraction 3/3 is not a proper fraction because the numerator is equal to the denominator. The function should return false.
 const equalFraction = isProperFraction(3, 3);
 // ====> complete with your assertion
+assertEquals(equalFraction, false);
 
 // Stretch:
 // What other scenarios could you test for?
+//we can test if the numerator is 0
+const zeroFraction = isProperFraction(0, 4);
+assertEquals(zeroFraction, true);
+
+//we can test if the denominator is 0
+const indefiniteFraction = isProperFraction(3, 0);
+assertEquals(indefiniteFraction, `you cannot have zero as a denominator`);

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

@@ -8,8 +8,31 @@
 // write one test at a time, and make it pass, build your solution up methodically
 // just make one change at a time -- don't rush -- programmers are deep and careful thinkers
 function getCardValue(card) {
-  if (rank === "A") {
+  function strictNumber(rank) {
+    if (/^(0|[1-9][0-9]*)$/.test(rank)) {
+      return true;
+    }
+    return false;
+  }
+
+  let rank = card.slice(0, card.length - 1);
+
+  if (strictNumber(rank)) {
+    if (
+      Number.isInteger(Number(rank)) &&
+      Number(rank) > 1 &&
+      Number(rank) <= 10
+    ) {
+      return Number(rank);
+    }
+  }
+
+  if (rank.includes("J") || rank.includes("Q") || rank.includes("K")) {
+    return 10;
+  } else if (rank.includes("A")) {
     return 11;
+  } else {
+    return "Invalid card rank.";
   }
 }
 
@@ -38,20 +61,25 @@ assertEquals(aceofSpades, 11);
 // Given a card with a rank between "2" and "9",
 // When the function is called with such a card,
 // Then it should return the numeric value corresponding to the rank (e.g., "5" should return 5).
-const fiveofHearts = getCardValue("5♥");
+const fiveofHearts = getCardValue("9♥");
 // ====> write your test here, and then add a line to pass the test in the function above
-
+assertEquals(fiveofHearts, 9);
 // Handle Face Cards (J, Q, K):
 // Given a card with a rank of "10," "J," "Q," or "K",
 // When the function is called with such a card,
 // Then it should return the value 10, as these cards are worth 10 points each in blackjack.
-
+const faceCards = getCardValue("J♥");
+assertEquals(faceCards, 10);
 // Handle Ace (A):
 // Given a card with a rank of "A",
 // When the function is called with an Ace,
 // Then it should, by default, assume the Ace is worth 11 points, which is a common rule in blackjack.
+const ace = getCardValue("A♥");
+assertEquals(ace, 11);
 
 // Handle Invalid Cards:
 // Given a card with an invalid rank (neither a number nor a recognized face card),
 // When the function is called with such a card,
 // Then it should throw an error indicating "Invalid card rank."
+const invalidCard = getCardValue("100♠");
+assertEquals(invalidCard, "Invalid card rank.");

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

@@ -12,15 +12,27 @@ test("should identify right angle (90°)", () => {
 // Case 2: Identify Acute Angles:
 // When the angle is less than 90 degrees,
 // Then the function should return "Acute angle"
+test("should identify acute angle (90°<)", () => {
+  expect(getAngleType(45)).toEqual("Acute angle");
+});
 
 // Case 3: Identify Obtuse Angles:
 // When the angle is greater than 90 degrees and less than 180 degrees,
 // Then the function should return "Obtuse angle"
+test("should identify obtuse angle (>90° && 180°<)", () => {
+  expect(getAngleType(120)).toEqual("Obtuse angle");
+});
 
 // Case 4: Identify Straight Angles:
 // When the angle is exactly 180 degrees,
 // Then the function should return "Straight angle"
+test("should identify straight angle (180°)", () => {
+  expect(getAngleType(180)).toEqual("Straight angle");
+});
 
 // Case 5: Identify Reflex Angles:
 // When the angle is greater than 180 degrees and less than 360 degrees,
 // Then the function should return "Reflex angle"
+test("should identify reflex angle (> 180° && < 360°)", () => {
+  expect(getAngleType(270)).toEqual("Reflex angle");
+});

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

@@ -7,7 +7,23 @@ test("should return true for a proper fraction", () => {
 });
 
 // Case 2: Identify Improper Fractions:
+test("should return false for an improper fraction", () => {
+  expect(isProperFraction(7, 4)).toEqual(false);
+  expect(isProperFraction(35, 8)).toEqual(false);
+  expect(isProperFraction(-5, 3)).toEqual(false);
+  expect(isProperFraction(8, -7)).toEqual(false);
+});
 
 // Case 3: Identify Negative Fractions:
+test("should return true for a proper fraction based on the absolute values of the numerator and denominator", () => {
+  expect(isProperFraction(-3, 8)).toEqual(true);
+  expect(isProperFraction(-3, -8)).toEqual(true);
+  expect(isProperFraction(3, -8)).toEqual(true);
+  expect(isProperFraction(3, 8)).toEqual(true);
+});
 
 // Case 4: Identify Equal Numerator and Denominator:
+test("should return false for an equal fraction", () => {
+  expect(isProperFraction(4, 4)).toEqual(false);
+  expect(isProperFraction(-7, -7)).toEqual(false);
+});

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

@@ -2,12 +2,30 @@
 // We will use the same function, but write tests for it using Jest in this file.
 const getCardValue = require("../implement/3-get-card-value");
 
-test("should return 11 for Ace of Spades", () => {
-  const aceofSpades = getCardValue("A♠");
-  expect(aceofSpades).toEqual(11);
-});
-
 // Case 2: Handle Number Cards (2-10):
+test("should return a number matching the rank value for number cards", () => {
+  expect(getCardValue("2♠")).toEqual(2);
+  expect(getCardValue("3◆")).toEqual(3);
+  expect(getCardValue("10♥")).toEqual(10);
+  expect(getCardValue("9♠")).toEqual(9);
+  expect(getCardValue("7♥")).toEqual(7);
+});
 // Case 3: Handle Face Cards (J, Q, K):
+test("should return 10 for Face Cards", () => {
+  expect(getCardValue("J♠")).toEqual(10);
+  expect(getCardValue("Q◆")).toEqual(10);
+  expect(getCardValue("K♥")).toEqual(10);
+});
 // Case 4: Handle Ace (A):
+test("should return 11 for Ace", () => {
+  const aceCard = getCardValue("A◆");
+  expect(aceCard).toEqual(11);
+});
 // Case 5: Handle Invalid Cards:
+test("should return invalid card rank for cards that are not in the suite", () => {
+  expect(getCardValue("100♠")).toEqual("Invalid card rank.");
+  expect(getCardValue("3.1416◆")).toEqual("Invalid card rank.");
+  expect(getCardValue("10.9♥")).toEqual("Invalid card rank.");
+  expect(getCardValue("09♠")).toEqual("Invalid card rank.");
+  expect(getCardValue("7+♥")).toEqual("Invalid card rank.");
+});