Millena mesfin/Sprint-2-exercices /structuring and testing data

Sprint-2/debug/0.js

@@ -5,3 +5,14 @@ function multiply(a, b) {
 }
 
 console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
+
+// Line#3: A function named multiply is defined,takes two parameters a and b.
+// Line#4: calling the multiply function.
+// Line#7:The template literal (${multiply(10, 32)}) tries to include the result of multiply(10, 32) in the string.
+// Result: Undefined
+function multiply(a, b) {return a * b;
+}
+console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
+// The multiply function returns the result.
+
+

Sprint-2/debug/1.js

@@ -6,3 +6,9 @@ function sum(a, b) {
 }
 
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
+// Return a + b; // Put return expression on one line, otherwise the value will be undefined.
+
+function sum(a, b) {
+  return a + b;
+}
+// Fixed the code

Sprint-2/debug/2.js

@@ -12,3 +12,11 @@ console.log(`The last digit of 806 is ${getLastDigit(806)}`);
 
 // This program should tell the user the last digit of each number.
 // Explain why getLastDigit is not working properly - correct the problem
+
+// Line#3; it always uses number variable.
+// Line#5; we need to make getLastDigit accept a parameter.
+
+function getLastDigit(number) {
+  return num.toString().slice(-1);
+}
+//Fixed the code

Sprint-2/errors/0.js

@@ -7,3 +7,16 @@ function capitalise(str) {
   let str = `${str[0].toUpperCase()}${str.slice(1)}`;
   return str;
 }
+
+//The function capitalise accepts a parameter named str.
+
+//In JavaScript, we cannot use let to declare a new variable with the same name as an existing parameter within the same scope. 
+//This will throw an error.
+
+function capitalise(str) {
+  str = `${str[0].toUpperCase()}${str.slice(1)}`;
+  // I ommited let
+  return str;
+}
+
+// Fixed the code.

Sprint-2/extend/format-time.js

@@ -3,17 +3,45 @@
 
 function formatAs12HourClock(time) {
   const hours = Number(time.slice(0, 2));
+  const minutes = time.slice(3, 5); // 〰️ Get the minute part of the time
+
+  // 〰️ Validate the input: check if hours and minutes are numbers and within valid ranges
+  if (isNaN(hours) || isNaN(minutes) || hours < 0 || hours > 23 || minutes < 0 || minutes > 59) {
+    return null; // 〰️ Return null for invalid input
+  }
+
+  // 〰️ Handle midnight (00:00)
+  if (hours === 0) {
+    return `12:${minutes} am`;
+  }
+
+  // 〰️ Handle noon (12:00)
+  if (hours === 12) {
+    return `12:${minutes} pm`;
+  }
+
+  // 〰️ Handle PM times (hours greater than 12)
   if (hours > 12) {
     return `${hours - 12}:00 pm`;
+    return `${hours - 12}:${minutes} pm`;
   }
   return `${time} am`;
+  // 〰️ Handle AM times (hours less than 12)
+  return `${hours}:${minutes} am`;
 }
 
 const currentOutput = formatAs12HourClock("08:00");
 const targetOutput = "08:00 am";
+//Test cases
+
+// 〰️ Test a standard morning time (8:00 AM)
+const currentOutput1 = formatAs12HourClock("08:00");
+const targetOutput1 = "08:00 am";
 console.assert(
   currentOutput === targetOutput,
   `current output: ${currentOutput}, target output: ${targetOutput}`
+   currentOutput1 === targetOutput1,
+  `current output: ${currentOutput1}, target output: ${targetOutput1}`
 );
 
 const currentOutput2 = formatAs12HourClock("23:00");
@@ -22,3 +50,77 @@ console.assert(
   currentOutput2 === targetOutput2,
   `current output: ${currentOutput2}, target output: ${targetOutput2}`
 );
+
+// 〰️ Additional test cases
+
+// 〰️ Test midnight (12:00 AM)
+const currentOutput3 = formatAs12HourClock("00:00");
+const targetOutput3 = "12:00 am";
+console.assert(
+  currentOutput3 === targetOutput3,
+  `current output: ${currentOutput3}, target output: ${targetOutput3}`
+);
+
+// 〰️ Test noon (12:00 PM)
+const currentOutput4 = formatAs12HourClock("12:00");
+const targetOutput4 = "12:00 pm";
+console.assert(
+  currentOutput4 === targetOutput4,
+  `current output: ${currentOutput4}, target output: ${targetOutput4}`
+);
+
+// 〰️ Test just after noon (12:30 PM)
+const currentOutput5 = formatAs12HourClock("12:30");
+const targetOutput5 = "12:30 pm";
+console.assert(
+  currentOutput5 === targetOutput5,
+  `current output: ${currentOutput5}, target output: ${targetOutput5}`
+);
+
+// 〰️ Test just after midnight (12:30 AM)
+const currentOutput6 = formatAs12HourClock("00:30");
+const targetOutput6 = "12:30 am";
+console.assert(
+  currentOutput6 === targetOutput6,
+  `current output: ${currentOutput6}, target output: ${targetOutput6}`
+);
+
+// 〰️ Invalid input cases
+
+// 〰️ Test an invalid time (hours out of range)
+const currentOutput7 = formatAs12HourClock("24:00");
+console.assert(
+  currentOutput7 === null,
+  `expected null but got: ${currentOutput7}`
+);
+
+// 〰️ Test an invalid time (minutes out of range)
+const currentOutput8 = formatAs12HourClock("12:60");
+console.assert(
+  currentOutput8 === null,
+  `expected null but got: ${currentOutput8}`
+);
+
+// 〰️ Test completely invalid input (non-numeric string)
+const currentOutput9 = formatAs12HourClock("invalid");
+console.assert(
+  currentOutput9 === null,
+  `expected null but got: ${currentOutput9}`
+);
+
+// 〰️ Test missing hour digit (invalid format)
+const currentOutput10 = formatAs12HourClock("8:00");
+console.assert(
+  currentOutput10 === null,
+  `expected null but got: ${currentOutput10}`
+);
+
+console.log(formatAs12HourClock("07:00"));
+console.log(formatAs12HourClock("19:00"));
+console.log(formatAs12HourClock("00:00"));
+console.log(formatAs12HourClock("12:00"));
+console.log(formatAs12HourClock("24:00"));
+console.log(formatAs12HourClock("23:59"));
+console.log(formatAs12HourClock("invalid"));
+console.log(formatAs12HourClock("22:63"));
+

Sprint-2/implement/bmi.js

@@ -13,3 +13,23 @@
 // Given someone's weight in kg and height in metres
 // Then when we call this function with the weight and height
 // It should return their Body Mass Index to 1 decimal place
+
+
+
+function calculatedBMI(weight, height) {
+    // Square the height
+    const heightSquared = height * height;
+
+    // Divide weight by squared height
+    const bmi = weight / heightSquared;
+
+    // Return the BMI rounded to 1 decimal place
+    return parseFloat(bmi.toFixed(1));
+}
+
+console.log(calculatedBMI(70, 1.73)); // Outputs: 23.4
+
+// First, we’re declaring a function named calculateBMI, which takes two parameters: weight (in kilograms) and height (in meters).
+// Then we create a variable heightSquared and set it equal to the height multiplied by itself. This step squares the height, which is part of the BMI formula.
+//  We calculate the BMI by dividing the weight by heightSquared.
+// The function will return 23.4 as the BMI, which is rounded to one decimal place, as required.

Sprint-2/implement/cases.js

@@ -13,3 +13,20 @@
 
 // You will need to come up with an appropriate name for the function
 // Use the string documentation to help you find a solution
+
+
+
+function toUpperSnakeCase(inputString) {
+    // Convert the string to uppercase and replace spaces with underscores
+    return inputString.toUpperCase().replace(/ /gi, "_");
+}
+
+console.log(toUpperSnakeCase("hello there"));
+console.log(toUpperSnakeCase("lord of the rings"));
+
+
+// inputString.toUpperCase() converts all letters to uppercase.
+// .replace(/ /g, "_") uses a regular expression to replace all spaces in the string with underscores (_), where the /g flag ensures that all spaces are replaced (not just the first one).
+// Using .replace(/ /g, "_") with the g flag tells JavaScript to replace all spaces in the string, not just the first one.
+// /g: Replaces all occurrences of the pattern, but is case-sensitive.
+// /gi: Replaces all occurrences of the pattern and is case-insensitive.

Sprint-2/implement/to-pounds.js

@@ -4,3 +4,29 @@
 // You will need to declare a function called toPounds with an appropriately named parameter.
 
 // You should call this function a number of times to check it works for different inputs
+
+
+// We need to encapsulate this logic into a reusable function called toPounds, which should take a penceString as a parameter and return a formatted pounds-and-pence string. Then, we can test this function with different inputs to ensure it works correctly.
+
+function toPounds(penceString) {
+    // Step 1: Remove the trailing "p" from the string
+    const penceStringWithoutTrailingP = penceString.substring(0, penceString.length - 1);
+
+    // Step 2: Pad the numeric part to ensure at least 3 digits
+    const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+
+    // Step 3: Extract the pounds and pence parts
+    const pounds = paddedPenceNumberString.substring(0, paddedPenceNumberString.length - 2);
+    const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, "0");
+
+    // Step 4: Return the formatted pounds and pence string
+    return `£${pounds}.${pence}`;
+}
+
+
+// Testing the function with different inputs
+console.log(toPounds("399p")); // Expected output: "£3.99"
+console.log(toPounds("50p"));  // Expected output: "£0.50"
+console.log(toPounds("7p"));   // Expected output: "£0.07"
+console.log(toPounds("1000p")); // Expected output: "£10.00"
+console.log(toPounds("12345p")); // Expected output: "£123.45"

Sprint-2/implement/vat.js

@@ -8,3 +8,19 @@
 // Given a number,
 // When I call this function with a number
 // it returns the new price with VAT added on
+
+
+
+// Define a function named addVAT that takes one parameter: price
+function addVAT(price) {
+
+    // Step 1: Calculate the price with VAT by multiplying the price by 1.2
+    // (1.2 represents the original price + 20% VAT)
+    const priceWithVAT = price * 1.2;
+
+    // 〰️ Step 2: Return the new price with VAT included
+    return priceWithVAT;
+} 
+
+console.log(addVAT(50)); // Outputs "60"
+console.log(addVAT(80)); // Outputs "96"

Sprint-2/interpret/time-format.js

@@ -19,13 +19,16 @@ function formatTimeDisplay(seconds) {
 // Questions
 
 // a) When formatTimeDisplay is called how many times will pad be called?
+// pad will be called three times—once for each of totalHours, remainingMinutes, and remainingSeconds.
 
 // Call formatTimeDisplay with an input of 61, now answer the following:
 
 // b) What is the value assigned to num when pad is called for the first time?
-
+// The first call to pad is for totalHours, which is 0. So, num is assigned the value 0 during the first call.
 // c) What is the return value of pad is called for the first time?
+//  When pad(0) is called, it returns "00" because padStart(2, "0") ensures the output has two characters.
 
 // d) What is the value assigned to num when pad is called for the last time in this program?  Explain your answer
-
+// The last call to pad is for remainingSeconds, which is 1. So, num is assigned the value 1 during the last call.
 // e) What is the return value assigned to num when pad is called for the last time in this program?  Explain your answer
+// When pad(1) is called, it returns "01" because padStart(2, "0") pads the single digit 1 to make it two characters ("01").