Barcelona | OCT-25 | Tatiana Kuzmina | Sprint 3 | Module-Structuring-and-Testing-Data

Sprint-1/1-key-exercises/1-count.js

@@ -4,3 +4,6 @@ count = count + 1;
 
 // Line 1 is a variable declaration, creating the count variable with an initial value of 0
 // Describe what line 3 is doing, in particular focus on what = is doing
+//Answer:
+// Line 3 takes the current value of `count`, adds 1, and assigns the result back to `count`.
+// The = operator is the assignment operator.

Sprint-1/1-key-exercises/2-initials.js

@@ -5,7 +5,9 @@ let lastName = "Johnson";
 // Declare a variable called initials that stores the first character of each string.
 // This should produce the string "CKJ", but you must not write the characters C, K, or J in the code of your solution.
 
-let initials = ``;
-
+let initials = firstName[0] + middleName[0] + lastName[0];
+console.log(initials)
 // https://www.google.com/search?q=get+first+character+of+string+mdn
 
+// The variable 'initials' takes the first character of firstName, middleName, and lastName, 
+// and combines them to form a new string.

Sprint-1/1-key-exercises/3-paths.js

@@ -17,7 +17,8 @@ console.log(`The base part of ${filePath} is ${base}`);
 // Create a variable to store the dir part of the filePath variable
 // Create a variable to store the ext part of the variable
 
-const dir = ;
-const ext = ;
+const dir = filePath.slice(0, lastSlashIndex);
+const lastDotIndex = base.lastIndexOf(".");
+const ext = base.slice(lastDotIndex);
 
 // https://www.google.com/search?q=slice+mdn

Sprint-1/1-key-exercises/4-random.js

@@ -7,3 +7,9 @@ const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
 // Try breaking down the expression and using documentation to explain what it means
 // It will help to think about the order in which expressions are evaluated
 // Try logging the value of num and running the program several times to build an idea of what the program is doing
+//Answer:
+// The variable 'num' stores a random integer between 'minimum' (1) and 'maximum' (100), inclusive.
+// Math.random() generates a random number from 0 up to (but not including) 1.
+// Multiplying by (maximum - minimum + 1) scales it to the desired range.
+// Math.floor() rounds down to the nearest whole number.
+// Adding 'minimum' shifts the range so it starts at 1 instead of 0.

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

@@ -1,2 +1,2 @@
-This is just an instruction for the first activity - but it is just for human consumption
-We don't want the computer to run these 2 lines - how can we solve this problem?
+//This is just an instruction for the first activity - but it is just for human consumption
+//We don't want the computer to run these 2 lines - how can we solve this problem?

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

@@ -1,4 +1,9 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
+let age = 33;
 age = age + 1;
+console.log(age); 
+
+// We use 'let' to create a variable that can be reassigned.
+// 'age' starts at 33, then we add 1 to it and store the result back in 'age'.
+// console.log(age) outputs 34.

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

@@ -1,5 +1,9 @@
 // Currently trying to print the string "I was born in Bolton" but it isn't working...
 // what's the error ?
 
-console.log(`I was born in ${cityOfBirth}`);
 const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);
+
+// The error was that the variable 'cityOfBirth' was used before it was declared.
+// Using 'const', a variable must be declared before it can be accessed.
+// Correct order: first declare the variable, then use it in console.log.

Sprint-1/2-mandatory-errors/3.js

@@ -1,5 +1,6 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+const last4Digits = cardNumber.toString().slice(-4);
+console.log(last4Digits);
 
 // The last4Digits variable should store the last 4 digits of cardNumber
 // However, the code isn't working

Sprint-1/2-mandatory-errors/4.js

@@ -1,2 +1,8 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const hour12ClockTime = "20:53";
+const hour24ClockTime = "08:53";
+
+console.log(hour12ClockTime);
+console.log(hour24ClockTime);
+
+// Variable names cannot start with a number, so I use hour12ClockTime and hour24ClockTime.
+// This way the code works and prints the correct times.

Sprint-1/3-mandatory-interpret/1-percentage-change.js

@@ -2,7 +2,7 @@ let carPrice = "10,000";
 let priceAfterOneYear = "8,543";
 
 carPrice = Number(carPrice.replaceAll(",", ""));
-priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
+priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",", ""));
 
 const priceDifference = carPrice - priceAfterOneYear;
 const percentageChange = (priceDifference / carPrice) * 100;
@@ -20,3 +20,26 @@ console.log(`The percentage change is ${percentageChange}`);
 // d) Identify all the lines that are variable declarations
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+
+
+//Answer:
+// a) Function calls are on these lines:
+// carPrice = Number(carPrice.replaceAll(",", ""));
+// priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",", ""));
+// console.log(`The percentage change is ${percentageChange}`);
+
+// b) Error occurs on the line:
+// priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
+// Reason: missing comma between arguments of replaceAll. Fix: replaceAll(",", "")
+
+// c) Variable reassignment lines:
+// carPrice = Number(carPrice.replaceAll(",", ""));
+// priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",", ""));
+
+// d) Variable declaration lines:
+// let carPrice = "10,000";
+// let priceAfterOneYear = "8,543";
+// const priceDifference = carPrice - priceAfterOneYear;
+// const percentageChange = (priceDifference / carPrice) * 100;
+
+// e) Number(carPrice.replaceAll(",", "")) removes all commas from the string and converts it to a number so calculations can be done.

Sprint-1/3-mandatory-interpret/2-time-format.js

@@ -23,3 +23,18 @@ console.log(result);
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+
+//Answer:
+// a) Variable declarations:
+// movieLength, remainingSeconds, totalMinutes, remainingMinutes, totalHours, result (6 in total)
+
+// b) Function calls:
+// console.log(result) (1 function call)
+
+// c) movieLength % 60 gives the remainder when movieLength is divided by 60, representing the remaining seconds after full minutes are counted
+
+// d) totalMinutes = (movieLength - remainingSeconds) / 60 calculates the total number of full minutes by removing leftover seconds and dividing by 60
+
+// e) result represents the movie duration in hours:minutes:seconds format. A better name could be formattedMovieLength or movieTimeString
+
+// f) The code works for any positive number of seconds, but single-digit minutes or seconds will not have leading zeros. To fix this, use padStart to format as hh:mm:ss

Sprint-1/3-mandatory-interpret/3-to-pounds.js

@@ -1,21 +1,27 @@
 const penceString = "399p";
+//    Initialize a string variable with the value "399p"
 
 const penceStringWithoutTrailingP = penceString.substring(
   0,
   penceString.length - 1
 );
-
+//Remove the trailing "p" from the string to get just the number part, e.g. "399"
 const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+//    Ensure the string has at least 3 characters by adding leading zeros if needed, e.g. "399" stays "399", "5" becomes "005"
+
 const pounds = paddedPenceNumberString.substring(
   0,
   paddedPenceNumberString.length - 2
 );
+//    Take all but the last two characters to get the pounds part, e.g. "3" from "399"
 
 const pence = paddedPenceNumberString
   .substring(paddedPenceNumberString.length - 2)
   .padEnd(2, "0");
+//    Take the last two characters for the pence part. If less than 2 characters, add a zero at the end, e.g. "99" from "399"
 
 console.log(`£${pounds}.${pence}`);
+//    Combine pounds and pence into a formatted string and print, e.g. "£3.99"
 
 // This program takes a string representing a price in pence
 // The program then builds up a string representing the price in pounds

Sprint-1/4-stretch-explore/chrome.md

@@ -16,3 +16,12 @@ Now try invoking the function `prompt` with a string input of `"What is your nam
 
 What effect does calling the `prompt` function have?
 What is the return value of `prompt`?
+
+Answer:
+Calling alert("Hello world!") shows a popup with the message "Hello world!" to the user.
+The alert function does not return any value (returns undefined).
+Calling prompt("What is your name?") shows a popup with a text input field asking the user for their name.
+The return value of prompt is the text entered by the user, or null if the user presses Cancel.
+Example:
+const myName = prompt("What is your name?");
+console.log(myName); // will display the name entered or null

Sprint-1/4-stretch-explore/objects.md

@@ -14,3 +14,13 @@ Answer the following questions:
 
 What does `console` store?
 What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+
+
+Answer:
+1. console stores an object that contains methods for logging and debugging, such as log, warn, error, assert, etc.
+2. typeof console returns "object", confirming that console is an object.
+3. console.log or console.assert uses the dot (.) syntax to access a method (function) of the console object.
+The dot means "this method belongs to this object".
+4. Example:
+console.log("Hello"); // calls the log method of the console object
+console.assert(1 === 2, "Not equal!"); // calls the assert method of the console object

Sprint-3/1-key-implement/1-get-angle-type.js

@@ -8,8 +8,11 @@
 // Then, write the next test! :) Go through this process until all the cases are implemented
 
 function getAngleType(angle) {
-   if (angle === 90) return "Right angle";
-   // read to the end, complete line 36, then pass your test here
+  if (angle === 90) return "Right angle"; // Case 1
+  if (angle < 90) return "Acute angle"; // Case 2
+  if (angle > 90 && angle < 180) return "Obtuse angle"; // Case 3
+  if (angle === 180) return "Straight angle"; // Case 4
+  if (angle > 180 && angle < 360) return "Reflex angle"; // Case 5
 }
 
 // we're going to use this helper function to make our assertions easier to read
@@ -43,14 +46,16 @@ assertEquals(acute, "Acute angle");
 // When the angle is greater than 90 degrees and less than 180 degrees,
 // 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
+const reflex = getAngleType(270);
+assertEquals(reflex, "Reflex angle");

Sprint-3/1-key-implement/2-is-proper-fraction.js

@@ -8,7 +8,8 @@
 // write one test at a time, and make it pass, build your solution up methodically
 
 function isProperFraction(numerator, denominator) {
-    if (numerator < denominator) return true;
+  // A proper fraction is when absolute value of numerator < denominator
+  return Math.abs(numerator) < denominator;
 }
 
 // here's our helper again
@@ -40,14 +41,24 @@ assertEquals(improperFraction, false);
 // 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);
-// ====> 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?
+// Test zero numerator
+const zeroNumerator = isProperFraction(0, 5); // 0/5 is proper
+assertEquals(zeroNumerator, true);
+
+// Test negative denominator
+const negativeDenominator = isProperFraction(2, -5); // numerator 2, denominator -5 => proper
+assertEquals(negativeDenominator, true);
+
+// Test numerator larger negative than denominator
+const largeNegativeNumerator = isProperFraction(-6, 5); // -6/5 is improper
+assertEquals(largeNegativeNumerator, false);

Sprint-3/1-key-implement/3-get-card-value.js

@@ -7,45 +7,73 @@
 // complete the rest of the tests and cases
 // 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") return 11;
+  // Extract rank by removing the last character (suit)
+  const rank = card.slice(0, -1);
+
+  // Ace
+  if (rank === "A") return 11;
+
+  // Face cards
+  if (rank === "J" || rank === "Q" || rank === "K" || rank === "10") return 10;
+
+  // Number cards
+  const numericRank = Number(rank);
+  if (numericRank >= 2 && numericRank <= 9) return numericRank;
+
+  // Invalid card
+  throw new Error("Invalid card rank.");
 }
 
-// You need to write assertions for your function to check it works in different cases
-// we're going to use this helper function to make our assertions easier to read
-// if the actual output matches the target output, the test will pass
+// Helper function for assertions
 function assertEquals(actualOutput, targetOutput) {
   console.assert(
     actualOutput === targetOutput,
     `Expected ${actualOutput} to equal ${targetOutput}`
   );
 }
+
 // Acceptance criteria:
 
-// Given a card string in the format "A♠" (representing a card in blackjack - the last character will always be an emoji for a suit, and all characters before will be a number 2-10, or one letter of J, Q, K, A),
-// When the function getCardValue is called with this card string as input,
-// Then it should return the numerical card value
+// Ace of Spades
 const aceofSpades = getCardValue("A♠");
 assertEquals(aceofSpades, 11);
 
-// Handle Number Cards (2-10):
-// 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).
+// Number Card: 5 of Hearts
 const fiveofHearts = getCardValue("5♥");
-// ====> write your test here, and then add a line to pass the test in the function above
-
-// 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.
-
-// 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.
-
-// 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."
+assertEquals(fiveofHearts, 5);
+
+// Face Card: King of Diamonds
+const kingOfDiamonds = getCardValue("K♦");
+assertEquals(kingOfDiamonds, 10);
+
+// Face Card: Queen of Clubs
+const queenOfClubs = getCardValue("Q♣");
+assertEquals(queenOfClubs, 10);
+
+// Number Card: 10 of Hearts
+const tenOfHearts = getCardValue("10♥");
+assertEquals(tenOfHearts, 10);
+
+// Invalid Card: "1♠"
+try {
+  getCardValue("1♠");
+  console.assert(false, "Expected an error for invalid card");
+} catch (e) {
+  console.assert(
+    e.message === "Invalid card rank.",
+    `Unexpected error: ${e.message}`
+  );
+}
+
+// Invalid Card: "Z♣"
+try {
+  getCardValue("Z♣");
+  console.assert(false, "Expected an error for invalid card");
+} catch (e) {
+  console.assert(
+    e.message === "Invalid card rank.",
+    `Unexpected error: ${e.message}`
+  );
+}