Cape Town |ITP-MAY-26|Enice Mutanda|Sprint 2| Coursework

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

@@ -1,13 +1,23 @@
 // Predict and explain first...
 //  =============> write your prediction here
+//  when running the code there will be a syntax error because the `str` being a function name has already been declared 
+// so it cant be returned .so the return variable should have another name
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
+//Uncaught SyntaxError: Identifier 'str' has already been declared
+
 
 function capitalise(str) {
   let str = `${str[0].toUpperCase()}${str.slice(1)}`;
   return str;
 }
 
 // =============> write your explanation here
+// there is an error in the code because the `str` is declared twice and there are unexpected token '}'.
+
 // =============> write your new code here
+function capitalise (str) {
+  return `${str[0].toUpperCase()}${str.slice(1)}`;
+}
+

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

@@ -1,7 +1,9 @@
 // Predict and explain first...
+// the will be answer of the percentage printed on the console.log.because the function has been declared.
 
 // Why will an error occur when this program runs?
 // =============> write your prediction here
+//there will be a code error because of the function has been declared twice.
 
 // Try playing computer with the example to work out what is going on
 
@@ -15,6 +17,13 @@ function convertToPercentage(decimalNumber) {
 console.log(decimalNumber);
 
 // =============> write your explanation here
-
+//when a function is called a value it given to the parameter.
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+
+function convertToPercentage(decimalNumber){
+  const percentage = `${decimalNumber * 100 }%`;
+  return percentage;
+}
+console.log (convertToPercentage(0.5)) //50 
+console.log (convertToPercentage(0.25)) //25%

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

@@ -1,20 +1,26 @@
 
 // Predict and explain first BEFORE you run any code...
-
+// the will be an error when this code runs because the retrun  varaible has not been assigined by a value and there function has not declared a variable.
 // this function should square any number but instead we're going to get an error
-
 // =============> write your prediction of the error here
+// synch equation 
 
 function square(3) {
     return num * num;
 }
 
 // =============> write the error message here
+// Uncaught SyntaxError: Unexpected number
+// >     return num * num;
+   //  return num * num;
 
-// =============> explain this error message here
+//Uncaught SyntaxError: Illegal return statement
 
+// =============> explain this error message here
+// the error is simply saying that the return variable has not been assigned by a value.`illegal statement`.
 // Finally, correct the code to fix the problem
-
 // =============> write your new code here
-
-
+function square (num){
+    return num * num;
+}
+console.log (square(3)) // 9

Sprint-2/2-mandatory-debug/0.js

@@ -1,14 +1,20 @@
 // Predict and explain first...
-
 // =============> write your prediction here
 
-function multiply(a, b) {
-  console.log(a * b);
-}
+// I predict that the code would fail because "console.log" was misplaced and
+// also because console.log doesnt return an value to use elsewhere.
 
-console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
 // =============> write your explanation here
 
-// Finally, correct the code to fix the problem
+// console.log only prints to the console — it returns undefined.
+// Since the template literal needs an actual value, the function
+// must use "return" instead of relying on console.log.
+
 //  =============> write your new code here
+function multiply(a, b) {
+  let result = a * b;
+  return result;
+}
+
+console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);

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

@@ -1,5 +1,6 @@
 // Predict and explain first...
 //  =============> write your prediction here
+//Js doesnt understand this code so it will read as an error because the return varable has not been aissinged any variable.
 
 function sum(a, b) {
   return;
@@ -9,5 +10,10 @@ function sum(a, b) {
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
 // =============> write your explanation here
+// js does not read values not assigned to any variable so the will be a syntax error not allowing the code to read .
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+function sum (a ,b){
+  return a + b ;
+}
+console.log(`The sum of 10 and 32 is ${sum(10.32)}`);

Sprint-2/2-mandatory-debug/2.js

@@ -1,7 +1,8 @@
-// Predict and explain first...
-
+// Predict and explain first..
 // Predict the output of the following code:
 // =============> Write your prediction here
+// i predict that the output will be 3 for all the numbers passed to the function because the function is not using the parameter
+// passed to it instead it is using the variable num which is 103  so it will always return 3 as the last digit of any number passed to it.
 
 const num = 103;
 
@@ -15,10 +16,19 @@ console.log(`The last digit of 806 is ${getLastDigit(806)}`);
 
 // Now run the code and compare the output to your prediction
 // =============> write the output here
+// The last digit of 42 is 3
+// The last digit of 105 is 3 
+// the last digit of 806 is 3
+
 // Explain why the output is the way it is
 // =============> write your explanation here
+// The output is the way it is because the function getlastDigit is not using the parameter passed to it.instead it is using the variable num which is 103.
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+// the function getLastDigit(num){
+// return num.string().slice(-1);}
 
 // This program should tell the user the last digit of each number.
 // Explain why getLastDigit is not working properly - correct the problem
+// this is because the function getLastDigit is not using the parameter passed to it.
+// instead it is using the variable num which is 103. so it will always return 3 as the last digit of any number passed to it.s

Sprint-2/3-mandatory-implement/1-bmi.js

@@ -16,4 +16,8 @@
 
 function calculateBMI(weight, height) {
     // return the BMI of someone based off their weight and height
-}
+    return Number((weight/(height *height)).toFixed(1));
+}
+
+
+

Sprint-2/3-mandatory-implement/2-cases.js

@@ -5,12 +5,55 @@
 
 // Implement a function that:
 
+function toUpperSnakeCase(input) {
+  return input.toUpperCase().split(" ").join("_");
+}
+
+
 // Given a string input like "hello there"
 // When we call this function with the input string
 // it returns the string in UPPER_SNAKE_CASE, so "HELLO_THERE"
+console.assert(
+  toUpperSnakeCase("hello there") === "HELLO_THERE",
+  '"hello there" should be "HELLO_THERE"'
+);
 
 // Another example: "lord of the rings" should be "LORD_OF_THE_RINGS"
 
+console.assert(
+  toUpperSnakeCase("lord of the rings") === "LORD_OF_THE_RINGS",
+  '"lord of the rings" should be "LORD_OF_THE_RINGS"'
+);
+
 // You will need to come up with an appropriate name for the function
 // Use the MDN string documentation to help you find a solution
 // This might help https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/toUpperCase
+
+console.assert(
+  toUpperSnakeCase("good morning") === "GOOD_MORNING",
+  '"good morning" should be "GOOD_MORNING"'
+);
+
+// Single word, no spaces at all
+console.assert(
+  toUpperSnakeCase("single") === "SINGLE",
+  '"single" should be "SINGLE"'
+);
+
+// Empty string
+console.assert(
+  toUpperSnakeCase("") === "",
+  "empty string should stay empty"
+);
+
+// Already-uppercase input
+console.assert(
+  toUpperSnakeCase("already UPPER case") === "ALREADY_UPPER_CASE",
+  '"already UPPER case" should be "ALREADY_UPPER_CASE"'
+);
+
+// Multiple consecutive spaces (each becomes its own underscore)
+console.assert(
+  toUpperSnakeCase("multiple   spaces") === "MULTIPLE___SPACES",
+  '"multiple   spaces" should be "MULTIPLE___SPACES"'
+);

Sprint-2/3-mandatory-implement/3-to-pounds.js

@@ -4,3 +4,21 @@
 // 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
+
+
+
+function toPounds(penceString) {
+  const penceStringWithoutTrailingP = penceString.substring(0, penceString.length - 1);
+  const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+  const pounds = paddedPenceNumberString.substring(0, paddedPenceNumberString.length - 2);
+  const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2)
+    .padEnd(2, "0");
+  return `£${pounds}.${pence}`;
+}
+// test the function with different inputs
+console.log(toPounds("399p")); // £3.99  
+console.log(toPounds("9p"));    // £0.09
+console.log(toPounds("99p"));   // £0.99
+console.log(toPounds("1234p")); // £12.34   
+
+

Sprint-2/4-mandatory-interpret/time-format.js

@@ -22,17 +22,24 @@ function formatTimeDisplay(seconds) {
 
 // a) When formatTimeDisplay is called how many times will pad be called?
 // =============> write your answer here
+// pad will be called 3 times, once for totalHours, once for remainingMinutes, and once for 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?
 // =============> write your answer here
+// The value assigned to num when pad is called for the first time is 0, which is the value of totalHours when the input is 61 seconds. 
 
 // c) What is the return value of pad is called for the first time?
 // =============> write your answer here
+// The return value of pad when it is called for the first time is "00", which is the padded string representation of totalHours (0) when the input is 61 seconds.  
 
 // d) What is the value assigned to num when pad is called for the last time in this program?  Explain your answer
 // =============> write your answer here
+// The value assigned to num when pad is called for the last time in this program is 1, which is the value of remainingSeconds when the input is 61 seconds. 
+// This is because 61 seconds is equal to 1 minute and 1 second, so the remaining seconds after calculating total minutes and hours is 1. 
 
 // e) What is the return value of pad when it is called for the last time in this program?  Explain your answer
 // =============> write your answer here
+// The return value of pad when it is called for the last time in this program is "01", which is the padded string representation of remainingSeconds (1) 
+// when the input is 61 seconds.

Sprint-2/5-stretch-extend/format-time.js

@@ -1,25 +1,88 @@
 // This is the latest solution to the problem from the prep.
 // Make sure to do the prep before you do the coursework
 // Your task is to write tests for as many different groups of input data or edge cases as you can, and fix any bugs you find.
-
 function formatAs12HourClock(time) {
-  const hours = Number(time.slice(0, 2));
-  if (hours > 12) {
-    return `${hours - 12}:00 pm`;
+  const [hourString, minutes] = time.split(":");
+  const hours = Number(hourString);
+
+  const pad = (h) => String(h).padStart(2, "0");
+
+  if (hours === 0) {
+    return `12:${minutes} am`;
+  }
+
+  if (hours === 12) {
+    return `12:${minutes} pm`;
   }
-  return `${time} am`;
+
+  if (hours < 12) {
+    return `${pad(hours)}:${minutes} am`;
+  }
+
+  return `${pad(hours - 12)}:${minutes} pm`;
 }
 
-const currentOutput = formatAs12HourClock("08:00");
-const targetOutput = "08:00 am";
+// Existing tests (updated to expect zero-padded hours)
+console.assert(
+  formatAs12HourClock("08:00") === "08:00 am",
+  "08:00 should be 08:00 am"
+);
+
+console.assert(
+  formatAs12HourClock("23:00") === "11:00 pm",
+  "23:00 should be 11:00 pm"
+);
+
+// Midnight
+console.assert(
+  formatAs12HourClock("00:00") === "12:00 am",
+  "00:00 should be 12:00 am"
+);
+
+// Noon
 console.assert(
-  currentOutput === targetOutput,
-  `current output: ${currentOutput}, target output: ${targetOutput}`
+  formatAs12HourClock("12:00") === "12:00 pm",
+  "12:00 should be 12:00 pm"
 );
 
-const currentOutput2 = formatAs12HourClock("23:00");
-const targetOutput2 = "11:00 pm";
+// PM with minutes, hour needs padding
 console.assert(
-  currentOutput2 === targetOutput2,
-  `current output: ${currentOutput2}, target output: ${targetOutput2}`
+  formatAs12HourClock("13:30") === "01:30 pm",
+  "13:30 should be 01:30 pm"
 );
+
+// AM with minutes, hour needs padding
+console.assert(
+  formatAs12HourClock("09:45") === "09:45 am",
+  "09:45 should be 09:45 am"
+);
+
+// Last minute of the day
+console.assert(
+  formatAs12HourClock("23:59") === "11:59 pm",
+  "23:59 should be 11:59 pm"
+);
+
+// One minute after midnight
+console.assert(
+  formatAs12HourClock("00:01") === "12:01 am",
+  "00:01 should be 12:01 am"
+);
+
+// One minute after noon
+console.assert(
+  formatAs12HourClock("12:01") === "12:01 pm",
+  "12:01 should be 12:01 pm"
+);
+
+// 1 PM, hour needs padding
+console.assert(
+  formatAs12HourClock("13:00") === "01:00 pm",
+  "13:00 should be 01:00 pm"
+);
+
+// 1 AM, hour needs padding
+console.assert(
+  formatAs12HourClock("01:00") === "01:00 am",
+  "01:00 should be 01:00 am"
+);