London | 26-ITP-Jan | Boualem Larbi Djebbour | sprint 2 | Coursework

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

@@ -1,5 +1,5 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> the function is not going to work because a variable is declared twice (str)
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
@@ -9,5 +9,10 @@ function capitalise(str) {
   return str;
 }
 
-// =============> write your explanation here
-// =============> write your new code here
+// =============> the error message 'Identifier 'str' has already been declared', diplays because the toUpperCase function does not change the value of the varible declared
+// but it creates a new one.
+// =============> my new code:
+function capitalise(str) {
+  let result = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return resault;
+}

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

@@ -1,7 +1,8 @@
 // Predict and explain first...
 
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// =============> because first: the variable decimalNumber is declared twice
+// second: the parameter decimalNumber is assigned to a value inside the function
 
 // Try playing computer with the example to work out what is going on
 
@@ -14,7 +15,13 @@ function convertToPercentage(decimalNumber) {
 
 console.log(decimalNumber);
 
-// =============> write your explanation here
+// =============> Identifier 'decimalNumber' has already been declared is the error msg thrown by the code
 
 // Finally, correct the code to fix the problem
-// =============> write your new code here
+// =============>
+function convertToPercentage(decimalNumber) {
+  //  const decimalNumber = 0.5; this line must be deleted
+  const percentage = `${decimalNumber * 100}%`;
+
+  return percentage;
+}

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
+// =============> identifier not declared (unknown)
 
 function square(3) {
     return num * num;
 }
 
-// =============> write the error message here
+// =============> Unexpected number
 
-// =============> explain this error message here
+// =============> the parameter shouldn't be given an argument in the function definition
 
 // Finally, correct the code to fix the problem
 
-// =============> write your new code here
-
-
+// =============> my new code
+function square(num) {
+    return num * num;
+}
+console.log(square(3));

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

@@ -1,14 +1,28 @@
 // Predict and explain first...
 
-// =============> write your prediction here
+// =============> the function when called will throw an error
 
 function multiply(a, b) {
   console.log(a * b);
 }
 
 console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
-// =============> write your explanation here
+// =============> the function multiply has no return statement
 
 // Finally, correct the code to fix the problem
-//  =============> write your new code here
+//  =============>
+function multiply(a, b) {
+  return a * b; // we change the console.log statement with the return statement
+}
+
+console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
+
+// an extra notice: the purpose of creating a function is to reuse it when needed
+// I've noticed that the parameters are already assigned to values 10 and 32, so I changed the code to the following:
+function multiply(a, b) {
+  return console.log(
+    `The result of multiplying ` + a + ` and ` + b + ` is ` + a * b
+  );
+}
+multiply(10, 32);

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

@@ -1,5 +1,5 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> The sum of 10 and 32 is undefined
 
 function sum(a, b) {
   return;
@@ -8,6 +8,12 @@ function sum(a, b) {
 
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
-// =============> write your explanation here
+// =============> the function sum returns Nul because it's straight followed by semicolon thate ends the statement
+// also the statement a + b is in new line
 // Finally, correct the code to fix the problem
-//  =============> write your new code here
+//  =============> my new code
+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 +1,10 @@
 // Predict and explain first...
 
 // Predict the output of the following code:
-// =============> Write your prediction here
+// =============>
+// The last digit of 42 is 3
+// The last digit of 105 is 3
+// The last digit of 806 is 3
 
 const num = 103;
 
@@ -14,11 +17,21 @@ 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
+// =============> the variable num is assigned to the value 103 in the global scope and not assigned to any value in the function scope
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+function getLastDigit(num) {
+  // we add the identifier num as parameter to the 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)}`);
 
 // 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

@@ -3,7 +3,7 @@
 // The BMI calculation divides an adult's weight in kilograms (kg) by their height in metres (m) squared.
 
 // For example, if you weigh 70kg (around 11 stone) and are 1.73m (around 5 feet 8 inches) tall, you work out your BMI by:
-
+//
 // squaring your height: 1.73 x 1.73 = 2.99
 // dividing 70 by 2.99 = 23.41
 // Your result will be displayed to 1 decimal place, for example 23.4.
@@ -15,5 +15,6 @@
 // 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
-}
+  return (BMI = (weight / (height * height)).toFixed(1)); // return the BMI of someone based off their weight and height
+}
+console.log(calculateBMI(90, 1.77)); // when calling this function with given someone's weight and height

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(wordsSet) {
+  let wsSnakeCase = wordsSet.replaceAll(" ", "_");
+  let wsupperSnakeCase = wsSnakeCase.toUpperCase();
+  return console.log(wsupperSnakeCase);
+}
+upperSnakeCase("i do not know"); // evaluates to: "I_DO_NOT_KNOW"

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 console.log(`£${pounds}.${pence}`);
+}
+toPounds("399p"); // £3.99
+toPounds("1095p"); // £10.95

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

@@ -18,17 +18,27 @@ 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
 
 // 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 is 0
 
 // c) What is the return value of pad is called for the first time?
-// =============> write your answer here
+// =============> the return value of pad is called for the first time 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
+// =============> the value assigned to num is 1
+// because the last time pad is called for the remainingSeconds holding the value 1
+// return pad(remainingSeconds)
+// function pad(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
+// =============> the return value of pad is called for the last time is "01"
+// because the argument passed to the pad parameter is the value of the remainingSeconds wich is 1
+// function pad(1){
+// return 1.toString().padStart(2, "0");
+// return "1".pad(2,"0");
+// return "01"
+//}