LONDON | May-2025 | Aida Eslamimoghadam| Module-Structuring-and-Testing-Data | Sprint-2

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

@@ -1,13 +1,24 @@
 // Predict and explain first...
-//  =============> write your prediction here
+// =============>  ANSWER
+// It takes a string and change its first letter to capitial letter aida -----> Aida
 
 // 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;
+// }
+
+// // =============> ANSWER
+// SyntaxError: Identifier 'str' has already been declared
+// It is not allow to  redeclare the parameter str inside the function
+
+// // =============> write your new code here
+let name = "aida";
+
 function capitalise(str) {
-  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
-  return str;
+  return `${str[0].toUpperCase()}${str.slice(1)}`;
 }
 
-// =============> write your explanation here
-// =============> write your new code here
+console.log(capitalise("aida"));

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

@@ -1,20 +1,36 @@
 // Predict and explain first...
+// =============> ANSWER
+// convertToPercentage function takes a number and multiplaited it to 100,to give the percentage and  then return it.
+//  but it doesn't work because we did'nt call it in the main part.
+//  Also  we can not declare a variable which has been declared already
 
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// we can not declare a variable which has been declared already
+// SyntaxError: Identifier 'decimalNumber' has already been declared
 
 // Try playing computer with the example to work out what is going on
 
-function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
-  const percentage = `${decimalNumber * 100}%`;
+// function convertToPercentage(decimalNumber) {
+//   const decimalNumber = 0.5;
+//   const percentage = `${decimalNumber * 100}%`;
 
-  return percentage;
-}
+//   return percentage;
+// }
 
-console.log(decimalNumber);
+// console.log(decimalNumber);
 
-// =============> write your explanation here
+// =============> ANSWER
+// It doesn't work because we did'nt call the function.
 
 // Finally, correct the code to fix the problem
+
 // =============> write your new code here
+
+const decimalNumber = 0.5;
+function convertToPercentage(decimalNumber) {
+  const percentage = `${decimalNumber * 100}%`;
+
+  return percentage;
+}
+
+console.log(convertToPercentage(decimalNumber));

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

@@ -1,20 +1,27 @@
-
-// Predict and explain first BEFORE you run any code...
+// This function does'nt work because we can not set literal value as a parameter.
 
 // this function should square any number but instead we're going to get an error
 
 // =============> write your prediction of the error here
+// An error for number instead of parameter
 
-function square(3) {
-    return num * num;
-}
+// function square(3) {
+//     return num * num;
+// }
 
 // =============> write the error message here
 
+// SyntaxError: Unexpected number
+
 // =============> explain this error message here
+// JavaScript is expecting a variable name (parameter) not a literal value
 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
 
+function square(num) {
+  return num * num;
+}
 
+console.log(square(5));

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

@@ -1,14 +1,23 @@
 // Predict and explain first...
+// function should multiply a by b and print the answer. and it DOESN'T return .
+//  So in the Console.log we don't have the result.
 
 // =============> write your prediction here
 
-function multiply(a, b) {
-  console.log(a * b);
-}
+// 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
+// we don't have result for function because there is no return in function . "The result of multiplying 10 and 32 is undefined"
 
 // 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 +1,22 @@
 // Predict and explain first...
 //  =============> write your prediction here
+// The code doesn't work because the expression a + b comes after the return statement
+// Once the compiler reaches return it exit the function.
+// There is no error. we just don't have answer
+// 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
+// There is no error. we just do not have correct answer.===> The sum of 10 and 32 is undefined
 // 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

@@ -1,24 +1,43 @@
 // Predict and explain first...
 
-// Predict the output of the following code:
 // =============> Write your prediction here
+// This code should return the last digit of each number but again it doesn't return a correct number because it ask to slice(-1) of "num"
+// Predict the output of the following code:
+// 3
+// 3
+// 3
 
-const num = 103;
+// const num = 103;
 
-function getLastDigit() {
-  return num.toString().slice(-1);
-}
+// function getLastDigit() {
+//   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 42 is ${getLastDigit(42)}`);
+// console.log(`The last digit of 105 is ${getLastDigit(105)}`);
+// 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
+// 3 3 3
 // Explain why the output is the way it is
+//
+
 // =============> write your explanation here
+//  because we didn't send our parameter to function.
+
 // Finally, correct the code to fix the problem
 // =============> write your new code here
 
+const num = 103;
+
+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

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

@@ -15,5 +15,11 @@
 // 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
-}
+  let squaredHeight = height * height;
+  let BMI = weight / squaredHeight;
+  BMI = Number(BMI.toFixed(1));
+  return BMI;
+}
+let result = calculateBMI(70, 1.73);
+
+console.log(`The BMI for a person weighing 70kg and 1.73m tall is ${result}`);

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

@@ -14,3 +14,11 @@
 // 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 UPPER_SNAKE_CASE(NewWord) {
+  let UpperWord = NewWord.toUpperCase();
+  let result = UpperWord.replaceAll(" ", "_");
+  return result;
+}
+
+console.log(UPPER_SNAKE_CASE("hello aida hope you are well"));

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

@@ -4,3 +4,36 @@
 // 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
+
+const penceString = 0;
+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 };
+}
+
+for (let i = 0; i < 5; i++) {
+  let randomNumber = Math.floor(Math.random() * 100001);
+
+  PenceRandom = randomNumber + "p";
+
+  let result = toPounds(PenceRandom);
+
+  console.log(
+    `Random: ${randomNumber}p → Pounds: £${result.pounds}.${result.pence}`
+  );
+}

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

@@ -10,25 +10,31 @@ 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
+// =============> 3 times.
 
 // 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
+// =============> It is 0
 
 // c) What is the return value of pad is called for the first time?
-// =============> write your answer here
+// =============> it is 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
+// =============> It is 1
+// The last time pad() is called, it's for the seconds value. Since remainingSeconds = 1, num is assigned 1.
+//  pad(1) returns "01" to format the time as hh:mm:ss
 
 // 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
+// =============> 01
+//The last call to pad() formats the seconds.
+// remainingSeconds is 1, so pad(1) is called.Inside pad, 1 becomes "1" (string), and since it's a single digit, it's padded to "01".
+// So the return value is "01".

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

@@ -3,23 +3,70 @@
 // 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 `${hours - 12}:00 pm`;
+  const [hourStr, minuteStr] = time.split(":");
+  let hours = Number(hourStr);
+  let suffix = "am";
+
+  if (hours === 0) {
+    hours = 12;
+  } else if (hours === 12) {
+    suffix = "pm";
+  } else if (hours > 12) {
+    hours -= 12;
+    suffix = "pm";
   }
-  return `${time} am`;
+
+  const formattedHour = String(hours).padStart(2, "0");
+  return `${formattedHour}:${minuteStr} ${suffix}`;
 }
 
 const currentOutput = formatAs12HourClock("08:00");
 const targetOutput = "08:00 am";
+console.log(
+  `The current time is 08:00 in 24-hour style, and this is ${targetOutput} in 12-hour style.`
+);
+
 console.assert(
   currentOutput === targetOutput,
   `current output: ${currentOutput}, target output: ${targetOutput}`
 );
 
 const currentOutput2 = formatAs12HourClock("23:00");
 const targetOutput2 = "11:00 pm";
+console.log(
+  `The current time is 23:00 in 24-hour style, and this is ${targetOutput2} in 12-hour style.`
+);
 console.assert(
   currentOutput2 === targetOutput2,
   `current output: ${currentOutput2}, target output: ${targetOutput2}`
 );
+
+const currentOutput3 = formatAs12HourClock("00:00");
+const targetOutput3 = "12:00 am";
+console.log(
+  `The current time is 00:00 in 24-hour style, and this is ${targetOutput3} in 12-hour style.`
+);
+console.assert(
+  currentOutput3 === targetOutput3,
+  `current output: ${currentOutput3}, target output: ${targetOutput3}`
+);
+
+const currentOutput4 = formatAs12HourClock("13:40");
+const targetOutput4 = "01:40 pm";
+console.log(
+  `The current time is 13:40 in 24-hour style, and this is ${targetOutput4} in 12-hour style.`
+);
+console.assert(
+  currentOutput4 === targetOutput4,
+  `current output: ${currentOutput4}, target output: ${targetOutput4}`
+);
+
+const currentOutput5 = formatAs12HourClock("22:15");
+const targetOutput5 = "10:15 pm";
+console.log(
+  `The current time is 22:15 in 24-hour style, and this is ${targetOutput5} in 12-hour style.`
+);
+console.assert(
+  currentOutput5 === targetOutput5,
+  `current output: ${currentOutput5}, target output: ${targetOutput5}`
+);