London | 26-ITP-May | Ebrahim Moqbel | Sprint 2 | course work

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

@@ -1,13 +1,32 @@
 // Predict and explain first...
 //  =============> write your prediction here
+/*
+I predict the function will throw a SyntaxError as the variable str has already been declared in the function parameter  
+function capitalise will capitalise the first letter with index 0 
+and will append the sliced string from index 1 which is the second letter
+*/
 
-// call the function capitalise with a string input
-// interpret the error message and figure out why an error is occurring
+//call the function capitalise with a string input
+
+// interpret the error message and figure out why an error is occurring :
+
+/* syntax Error :identifier the variabel has already been declared. 
+As we can see the str variable has already been declared in the prameter of the function instead we just return the value */
+
+// function capitalise(str) {
+//   let str = `${str[0].toUpperCase()}${str.slice(1)}`;
+//   console.log(str);
+//   return str;
+// }
+
+
+// =============> write your explanation here 
+/* syntax Error :identifier the variabel has already been declared. 
+As we can see the str variable has already been declared in the prameter of the function instead we just return the value */
 
 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("ebrahim"));
+console.log(capitalise('salomi'));

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

@@ -3,18 +3,29 @@
 // Why will an error occur when this program runs?
 // =============> write your prediction here
 
-// Try playing computer with the example to work out what is going on
+//1- The function is trying to declare the decimalNumber twice in the perameter and later as a new variable
+//2-console.log() is printing a variable in the local scope where it can't be accessed as it is inside the function
 
-function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
-  const percentage = `${decimalNumber * 100}%`;
+// Try playing computer with the example to work out what is going on
 
-  return percentage;
-}
+// function convertToPercentage(decimalNumber) {
+//   const decimalNumber = 0.5;
+//   const percentage = `${decimalNumber * 100}%`;
 
-console.log(decimalNumber);
+//   return percentage;
+// }
 
 // =============> write your explanation here
+/* The variable decimal Number has already been declared in the parameter 
+ and already is a local variable which can't be declared again causing a SyntaxError  
+As the decimalNumber inside the function we can't print it using the console.log() as it has no power to the local scope
+instead we can delete the second declaration and just leave the parameter as an input for the user 
+ Finally, correct the code to fix the problem */
 
-// 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));

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

@@ -1,20 +1,28 @@
-
 // Predict and explain first BEFORE you run any code...
 
 // this function should square any number but instead we're going to get an error
 
 // =============> write your prediction of the error here
+//I predict the funciton will throw a SyntaxEror as the perametters sould be valid variables like names or identifiers with upholding to the variable naming convention and in this case a number found
 
-function square(3) {
-    return num * num;
-}
+// function square(3) {
+//     return num * num;
+// }
 
 // =============> write the error message here
+//the Error is a syntax error: Unexpected number
 
 // =============> explain this error message here
+/* The function was givin a number as its perameter where in JS only allows varaible names and usnig a number causes a SyntaxError
+ Also, the function was returning num*num where num is undefined causing a syntax error 
+ */
 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
 
+function square(num) {
+  return num * num;
+}
 
+console.log(square(25));

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

@@ -1,14 +1,23 @@
 // Predict and explain first...
 
 // =============> write your prediction here
+// This function would multiply the two arguments a and b whatever that is
+// when we log the output we will get the string and the output of the function but because we are not returning an output we might run into an error 
 
-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
+//The console.log() inside the funtion will print a*b but when we call the function will return 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 +1,23 @@
 // Predict and explain first...
 //  =============> write your prediction here
+// The function suppose to return the sum of the two variables but we will encounter an error as the code after return is unreachable.
 
-function sum(a, b) {
-  return;
-  a + b;
-}
 
-console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
+// function sum(a, b) {
+//   return;
+//   a + b;
+// }
+// console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
 // =============> write your explanation here
+
+// As we return nothing by closing the line with a semicolon hence a + b is not returned where we tell the computer to exit and go back to global scope and the computer will not be able to read the lines after that
+
 // 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

@@ -2,23 +2,44 @@
 
 // Predict the output of the following code:
 // =============> Write your prediction here
+//getLastDigit will convert a number to a string
+// However, since there is no parameter or local variable to the function  we might run into an Error
 
-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
+// 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
+// As expected, the function has no parameters, so it relies on the global variable "num" as its only variable.
+// Since there are no parameters defined, the function permanently uses the global variable instead.
+// This means even if we pass arguments when calling the function, they will be ignored because there are no parameters to receive them.
+
 // Finally, correct the code to fix the problem
 // =============> 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
+/* the reason why getLastDigit isn't working properly is that it doesn't accept any arrguments where there isn't any perameters in its difination.
+where it uses the golabal varaible 'num' decalred outside the funtion and already set to 103
+
+The correct code includes a parameter 'num' in the difination this allows the function to accept the number passed to it when called*/

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 result = (weight/(height*height));
+    return Number(result.toFixed(1));
+
+
+}
+
+console.log(calculateBMI(70,1.7))
+console.log(calculateBMI(72,1.7))

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

@@ -14,3 +14,8 @@
 // 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 toUpperSnakeCase(string) {
+  return string.toUpperCase().replaceAll(" ", "_");
+}
+console.log(toUpperSnakeCase("hello there"));
+console.log(toUpperSnakeCase("lord of the rings"));

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

@@ -4,3 +4,24 @@
 // 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}`
+ }
+
+
+console.log(toPounds('987p'));
+console.log(toPounds('909p'));
+console.log(toPounds('345p'));

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

@@ -15,24 +15,27 @@ 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
+// =============> the first time pad was called with 61 the value is 00:01:01
 
 // c) What is the return value of pad is called for the first time?
-// =============> 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
+// =============> 1
+// the last time, pad() is called with the remaining seconds which is value 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
+// =============> 1
+// the return value is "1" but as we are using pad would be adding a leading of "0" to become "01"