Birmingham | 26-ITP-JAN | Merve Reis | Sprint 2 | Module Structuring and Testing Data

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

@@ -1,5 +1,5 @@
 // Predict and explain first...
-//  =============> write your prediction here
+// //My prediction` => The capitalise function tries to capitalize the first character of the string and concat it with the rest. This function may not run as it has error.
 
 // 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
+// call the function with a string argument
+capitalise("hello world");
+// the error is occurring because we are trying to declare a variable with the same name as the function parameter
+
+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...
 
+
+
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// The error will occur because the variable 'decimalNumber' is being redeclared.
 
 // Try playing computer with the example to work out what is going on
 
@@ -14,7 +16,14 @@ function convertToPercentage(decimalNumber) {
 
 console.log(decimalNumber);
 
-// =============> write your explanation here
+// the error is occurring because we are trying to declare a variable with the same name as the function parameter, which is not allowed in JavaScript.
 
 // 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...
+//It will throw a syntax error because 3 is not a valid.
 
 // this function should square any number but instead we're going to get an error
 
 // =============> write your prediction of the error here
+// this function should square any number but instead we're going to get an error
 
 function square(3) {
     return num * num;
 }
 
 // =============> write the error message here
+// SyntaxError: Unexpected number
 
 // =============> explain this error message here
+//The error occurs because function parameters must be valid identifiers (i.e., variable names), not literal numbers.
 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
+function square(num) {
+    return num * num;
+}
+console.log(square(3));
 
 

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

@@ -1,6 +1,7 @@
 // Predict and explain first...
 
 // =============> write your prediction here
+// The error will occur because the function 'multiply' does not return a value, so when we try to use it will return 'undefined'.
 
 function multiply(a, b) {
   console.log(a * b);
@@ -9,6 +10,12 @@ function multiply(a, b) {
 console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
 // =============> write your explanation here
+// The error occurs because the 'multiply' function does not have a return statement, so it returns 'undefined' by default.
 
 // 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

@@ -1,5 +1,6 @@
 // Predict and explain first...
 //  =============> write your prediction here
+// It will return 'undefined'.
 
 function sum(a, b) {
   return;
@@ -9,5 +10,11 @@ function sum(a, b) {
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
 // =============> write your explanation here
+// The error occurs because the 'sum' function has a return statement without a value, so it returns 'undefined' by default.
 // 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

@@ -2,6 +2,7 @@
 
 // Predict the output of the following code:
 // =============> Write your prediction here
+//The output will be 3 in each expression.
 
 const num = 103;
 
@@ -15,10 +16,28 @@ 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 output is:
+// 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 function `getLastDigit` is not taking any arguments, so it always returns the last digit of 103 which is '3'.
+
 // 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 function `getLastDigit` is not working properly because it was using `num`,
+// instead of the parameter passed to the function. By changing the function to accept a parameter `num`,
+// it now correctly returns the last digit of the number passed to it..

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

@@ -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 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

@@ -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 toUpperSnakeCase(string) {
+  return string.toUpperCase().replaceAll(" ", "_");
+}
+
+console.log(toUpperSnakeCase("hello there")); // should return "HELLO_THERE"

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

@@ -4,3 +4,11 @@
 // 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(penceAmount) {
+  const padded = penceAmount.padStart(3, "0");
+  const pounds = padded.substring(0, padded.length - 2);
+  const pence = padded.substring(padded.length - 2);
+  return `£${pounds}.${pence}p`;
+}
+
+console.log(toPounds("399"));

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

@@ -19,16 +19,31 @@ function formatTimeDisplay(seconds) {
 // a) When formatTimeDisplay is called how many times will pad be called?
 // =============> write your answer here
 
+// Answer: 3 times
+// pad(totalHours)
+// pad(remainingMinutes)
+// pad(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
+pad(num) = pad(0) = 0
 
 // c) What is the return value of pad is called for the first time?
 // =============> write your answer here
+pad(num) = pad(0) = "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
+// pad(num) = pad(1) = 1
+
+//Explanation 
+// Last call: pad(remainingSeconds)
+// remainingSeconds = 1
+// pad(1) → num = 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
+// pad(num) = pad(1) = "01" because the pad function converts the number to a string and pads it with a leading zero if it's only one digit long.