changes to Sprint2 key errors and debug updated

Author: DamianDL

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

@@ -1,13 +1,19 @@
 // Predict and explain first...
 //  =============> write your prediction here
-
+//Will error because we are trying to declare a variable with the same name as the parameter of the function. The error message will likely indicate that there is a syntax error or that the variable 'str' has already been declared.
 // 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;
-}
+//function capitalise(str) {
+  //let str = `${str[0].toUpperCase()}${str.slice(1)}`;
+  //return str;
+//}
 
 // =============> write your explanation here
+// The error is occurring because we are trying to declare a variable 'str' inside the function that has the same name as the parameter 'str'.To fix this problem,  create an variable with a new name Newstr . So we would change the line to: Newstr = `${str[0].toUpperCase()}${str.slice(1)}`; 
 // =============> write your new code here
+ function capitalise(str) {
+  let Newstr = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return Newstr;
+} 
+console.log(capitalise("hello world")); 

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

@@ -2,19 +2,27 @@
 
 // Why will an error occur when this program runs?
 // =============> write your prediction here
-
+// The error will occur because we are trying to declare a variable with the same name as the parameter of the function. The error message will likely indicate that there is a syntax error or that the variable 'str' 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
-
+// The error is occurring because we are trying to declare a variable 'decimalNumber' inside the function that has the same name as the parameter 'decimalNumber'. To fix this problem, we can different variable name for the parameter or the variable inside the function. For example, we could change the line to: const decimalNum = 0.5; and then use 'decimalNum' instead of 'decimalNumber' in the rest of the function.
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+function convertToPercentage(decimalNumber) {
+  const decimalNum = 0.5;
+  const percentage = `${decimalNum * 100}%`;  
+
+  return percentage;
+}
+
+console.log(convertToPercentage(0.5));

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

@@ -4,17 +4,20 @@
 // this function should square any number but instead we're going to get an error
 
 // =============> write your prediction of the error here
-
-function square(3) {
-    return num * num;
-}
+//function square(3) {
+  //  return num * num;
+//}
 
 // =============> write the error message here
-
+// SyntaxError: Unexpected number '3'
 // =============> explain this error message here
+// The error message is indicating that there is a syntax error in the code because we are trying to use a number '3' as a parameter name in the function declaration, which is not allowed in JavaScript. Parameter names must be valid identifiers, which cannot start with a number. To fix this error, we need to change the parameter name to a valid identifier, such as 'num' or 'x'. So we would change the line to: function square(num) { return num * num; }    
 
 // 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

@@ -1,14 +1,18 @@
 // Predict and explain first...
 
 // =============> write your prediction here
+// The error will occur because the function 'sum' is not returning the result of multiplying 'a' and 'b'. Instead, it is returning 'undefined' due to the function being incomplete. The error message will likely indicate that the result of the sum is 'undefined' when we try to log it to the console.
+//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 error is occurring because the function 'multiply' is not returning any value. In JavaScript, if a function does not explicitly return a value, it returns 'undefined' by default. To fix this problem, we need to add a return statement to the function that returns the result of multiplying 'a' and 'b'. For example, we could change the line to: return a * b; so that the function will return the correct result when called.
 // 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
+//The error will occur because the function 'sum' is not returning the result of summing 'a' and 'b'. Instead, it is returning 'undefined' due to the function being incomplete. The error message will likely indicate that the result of the sum is 'undefined' when we try to log it to the console.
+//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
+// The error is occurring because the function 'sum' is not returning any value. In JavaScript, if a function does not explicitly return a value, it returns 'undefined' by default. To fix this problem, we need to add a return statement to the function that returns the result of summing 'a' and 'b'. For example, we could change the line to: return a + b; so that the function will return the correct result when called.
 // 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 +2,37 @@
 
 // Predict the output of the following code:
 // =============> Write your prediction here
+//the output will be: an error because the function getLastDigit is not defined to take any parameters, but we are trying to pass a number as an argument when we call the function. The error message will likely indicate that getLastDigit is not a function or that it cannot be called with arguments.
+//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
+//it does run but returns the last digit of the number 103 for all three calls to getLastDigit, which is not the expected behavior. The output will be:
+// 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 parameters, so it always returns the last digit of the global variable 'num', which is 103. The function should take a number as a parameter and return the last digit of that number.
+
 // 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