London|May-2025|Alexandru Pocovnicu|Structuring and testing data/Coursework/sprint 2

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

@@ -1,13 +1,19 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> write your prediction here: "str" is already used as a parameter , i don't know if we gonna get an error or undefined
 
 // 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)}`;
+   str = `${str[0].toUpperCase()}${str.slice(1)}`;
   return str;
 }
+capitalise("hello");
+// =============> write your explanation here: the error occurs because "str" has already been declared when was used as a parameter
 
-// =============> write your explanation here
-// =============> write your new code here
+/* =============> write your new code here:
+function capitalise(str) {
+   str = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return str;
+}
+capitalise("hello");*/

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

@@ -1,20 +1,28 @@
 // Predict and explain first...
 
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+/* =============> write your prediction here: because on line 11 
+decimalNumber is already used as parameter so it can't be declared again inside the function*/
 
 // Try playing computer with the example to work out what is going on
 
-function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
+/*function convertToPercentage(decimalNumber) {
+  //decimalNumber = 0.5;
   const percentage = `${decimalNumber * 100}%`;
 
   return percentage;
 }
 
-console.log(decimalNumber);
-
+console.log(convertToPercentage(7));//ReferenceError: decimalNumber is not defined
+console.log(convertToPercentage(0.5));
 // =============> write your explanation here
 
 // Finally, correct the code to fix the problem
-// =============> write your new code here
+ =============> write your new code here:*/
+function convertToPercentage(decimalNumber) {
+
+  const percentage = `${decimalNumber * 100}%`;
+
+  return percentage;
+}
+console.log(convertToPercentage(0.5));

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

@@ -3,18 +3,20 @@
 
 // this function should square any number but instead we're going to get an error
 
-// =============> write your prediction of the error here
+// =============> write your prediction of the error here: num is undefined
 
-function square(3) {
+/*function square(3) {
     return num * num;
-}
+}*/
 
-// =============> write the error message here
+// =============> write the error message here SyntaxError: Unexpected number
 
 // =============> explain this error message here
 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
 
-
+function square(num) {
+    return num * num;
+}

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

@@ -1,14 +1,18 @@
 // Predict and explain first...
 
-// =============> write your prediction here
-
-function multiply(a, b) {
+// =============> write your prediction here: instead of "console.log(a * b);" should be "return..", might get undefined
+/*function multiply(a, b) {
   console.log(a * b);
 }
 
-console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
+console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);*/
 
-// =============> write your explanation here
+// =============> write your explanation here:instead of "console.log(a * b);" should be "return.."
 
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+function multiply(a, b) {
+  return (a * b);
+}
+
+console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);

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

@@ -1,13 +1,19 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> write your prediction here: Syntax error: The sum of 10 and 32 is undefined
 
-function sum(a, b) {
-  return;
-  a + b;
-}
+// function sum(a, b) {
+//   return;
+//    a + b;
+
+// }
 
-console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
+// console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
-// =============> write your explanation here
-// Finally, correct the code to fix the problem
+// =============> write your explanation here: the function will return 'undefined' because there is nothing coming after 'return'
 //  =============> 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

@@ -1,24 +1,34 @@
 // Predict and explain first...
 
 // Predict the output of the following code:
-// =============> Write your prediction here
+// =============> Write your prediction here:3,3,3
 
-const num = 103;
+//const num = 103;
 
-function getLastDigit() {
+/*function getLastDigit(num) {
   return num.toString().slice(-1);
 }
 
 console.log(`The last digit of 42 is ${getLastDigit(42)}`);
 console.log(`The last digit of 105 is ${getLastDigit(105)}`);
-console.log(`The last digit of 806 is ${getLastDigit(806)}`);
+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
-// Explain why the output is the way it is
-// =============> write your explanation here
+// =============> 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: because the const num has been assigned the value 103 and that's the value the fuction always uses
 // Finally, correct the code to fix the problem
-// =============> write your new code here
+// =============> write your new code here:
+function getLastDigit(num) {
+  return num.toString().slice(-1);
+}
+
+console.log(`The last digit of 42 is ${getLastDigit(42)}`);
+console.log(`The last digit of 105 is ${getLastDigit(105)}`);
+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
+// Explain why getLastDigit is not working properly - correct the problem: see above-line 22

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

@@ -15,5 +15,8 @@
 // It should return their Body Mass Index to 1 decimal place
 
 function calculateBMI(weight, height) {
-    // return the BMI of someone based off their weight and height
-}
+    const Bmi=weight/(height * height);
+    const roundedBmi = Math.round(Bmi * 10) / 10; 
+    return roundedBmi;
+}
+console.log(calculateBMI(90, 1.79)); 

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

@@ -14,3 +14,9 @@
 // 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
+function UpperSnakeCase(abc){
+    const convertToUpperCase=abc.toUpperCase();
+    const replaceSpace=convertToUpperCase.replaceAll(" ","_");
+    return replaceSpace
+}
+console.log(UpperSnakeCase("hello, how are you?"))

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

@@ -4,3 +4,26 @@
 // 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){
+     penceString = String(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}`;
+
+}
+console.log(toPounds("900p"));
+console.log(toPounds("90p"));
+console.log(toPounds("1209m"));

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

@@ -10,25 +10,26 @@ function formatTimeDisplay(seconds) {
 
   return `${pad(totalHours)}:${pad(remainingMinutes)}:${pad(remainingSeconds)}`;
 }
+console.log(formatTimeDisplay(61))
 
 // You will need to play computer with this example - use the Python Visualiser https://pythontutor.com/visualize.html#mode=edit
 // to help you answer these questions
 
 // Questions
 
 // a) When formatTimeDisplay is called how many times will pad be called?
-// =============> write your answer here
+// =============> write your answer here: 3
 
 // 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
+// =============> write your answer here: 0
 
 // c) What is the return value of pad is called for the first time?
-// =============> write your answer here
+// =============> write your answer here:00
 
 // 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
+// =============> write your answer here:1 because the remaining seconds is "1"
 
 // e) What is the return value assigned to num when pad is called for the last time in this program?  Explain your answer
-// =============> write your answer here
+// =============> write your answer here:01 because .padStart(2,"0") adds a "0"

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

@@ -4,8 +4,16 @@
 
 function formatAs12HourClock(time) {
   const hours = Number(time.slice(0, 2));
-  if (hours > 12) {
-    return `${hours - 12}:00 pm`;
+  const minutes=(time.slice(3,5));
+  if(hours===0)return `12:${minutes} am`
+  if(hours===24){
+    return `00:${minutes} am`
+  }
+  else if(hours===12){
+    return `12:${minutes} pm`
+  }
+  else if (hours > 12) {
+    return `${hours - 12}:${minutes} pm`;
   }
   return `${time} am`;
 }
@@ -23,3 +31,45 @@ console.assert(
   currentOutput2 === targetOutput2,
   `current output: ${currentOutput2}, target output: ${targetOutput2}`
 );
+const currentOutput3 = formatAs12HourClock("23:59");
+const targetOutput3 = "11:59 pm";
+console.assert(
+  currentOutput3 === targetOutput3,
+  `current output: ${currentOutput3}, target output: ${targetOutput3}`
+);
+const currentOutput4 = formatAs12HourClock("24:00");
+const targetOutput4 = "00:00 am";
+console.assert(
+  currentOutput4 === targetOutput4,
+  `current output: ${currentOutput4}, target output: ${targetOutput4}`
+);
+const currentOutput5 = formatAs12HourClock("12:01");
+const targetOutput5 = "12:01 pm";
+console.assert(
+  currentOutput5 === targetOutput5,
+  `current output: ${currentOutput5}, target output: ${targetOutput5}`
+);
+const currentOutput6 = formatAs12HourClock("11:59");
+const targetOutput6 = "11:59 am";
+console.assert(
+  currentOutput6 === targetOutput6,
+  `current output: ${currentOutput6}, target output: ${targetOutput6}`
+);
+const currentOutput7 = formatAs12HourClock("23:45");
+const targetOutput7 = "11:45 pm";
+console.assert(
+  currentOutput7 === targetOutput7,
+  `current output: ${currentOutput7}, target output: ${targetOutput7}`
+);
+const currentOutput8 = formatAs12HourClock("13:30");
+const targetOutput8= "1:30 pm";
+console.assert(
+  currentOutput8 === targetOutput8,
+  `current output: ${currentOutput8}, target output: ${targetOutput8}`
+);
+const currentOutput9 = formatAs12HourClock("00:00");
+const targetOutput9= "12:00 am";
+console.assert(
+  currentOutput9 === targetOutput9,
+  `current output: ${currentOutput9}, target output: ${targetOutput9}`
+);