I worked on interpreting code,fixing error, implementing of code, debugging of code

Author: Abduhasen

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

@@ -1,6 +1,6 @@
 // Predict and explain first...
 //  =============> write your prediction here
-
+// My prediction is that the function will throw an error because the variable which also the parameter is redeclared again inside the function.
 // 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
+// =============> write your explanation here: to explain, The parameter str already exists in that function's scope,
+// so trying to `let str = ...` again is redeclaring the same name in the same scope, and JS won't allow it.
+// =============> write your new code here: function capitalise(str) {
+//                                       let capitaliseFristLatter = `${str[0].toUpperCase()}${str.slice(1)}`;
+
+//                                       return capitaliseFristLatter;
+//                                         }

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

@@ -2,7 +2,7 @@
 
 // Why will an error occur when this program runs?
 // =============> write your prediction here
-
+// My prediction is that the variable `decimalNumber` is already declared and also the console.log can only log the variable decimalNumber.
 // Try playing computer with the example to work out what is going on
 
 function convertToPercentage(decimalNumber) {
@@ -14,7 +14,15 @@ function convertToPercentage(decimalNumber) {
 
 console.log(decimalNumber);
 
-// =============> write your explanation here
+// =============> write your explanation here: the variable was already declared in the parameter scope and it won't redeclare inside the function again
+//                                              and also the console.log was only working for the logging of the variable `decimalNumber` not the function.
 
 // Finally, correct the code to fix the problem
-// =============> write your new code here
+// =============> 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 +1,22 @@
-
 // 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
+// =============> write your prediction of the error here: it will throw an error because in the parameter(placeholder)
+//                                                                  there is constant value which js does not recognize.
 
 function square(3) {
-    return num * num;
+  return num * num;
 }
 
-// =============> write the error message here
+// =============> write the error message here: the error message SyntaxError: Unexpected number
 
-// =============> explain this error message here
+// =============> explain this error message here: syntax error, meaning it fails before the function even gets defined.
+//                                                 JS expects a parameter slot to contain a name (identifier) and gets confused
+//                                                 when it sees a raw number sitting there instead.
 
 // Finally, correct the code to fix the problem
 
-// =============> write your new code here
-
-
+// =============> write your new code here: function square(num) {
+//                                                return num * num;
+//                                           }

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

@@ -1,14 +1,22 @@
 // Predict and explain first...
 
-// =============> write your prediction here
+// =============> write your prediction here: My prediction is that in this function there is two console.log
+//                                            the result of this two log will print one with the value only 320 and
+//                                            the other one with the sentences of the log not the value.
 
 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
+// =============> write your explanation here: because of the log inside the function the outside function can't access the result so the log will print
+//                                             one  with the value only and second console.log will print the sentences with explanation of the result and
+//                                             undefined value because the the function doesn't access the operation.
 
 // Finally, correct the code to fix the problem
-//  =============> write your new code here
+//  =============> 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 +1,5 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> write your prediction here: the function have nothing to return so it will log the sentences with undefined value.
 
 function sum(a, b) {
   return;
@@ -8,6 +8,11 @@ function sum(a, b) {
 
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
-// =============> write your explanation here
+// =============> write your explanation here: firstly the process start accepting that it is a function and takes
+//                                             the parameter to hold the place then it go through the function but by the 5th line
+//                                             the function return and the value will come out undefined
 // Finally, correct the code to fix the problem
-//  =============> write your new code here
+//  =============> write your new code here: function sum(a, b) {
+//                                              return a + b;
+//
+//                                             }

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

@@ -1,7 +1,7 @@
 // Predict and explain first...
 
 // Predict the output of the following code:
-// =============> Write your prediction here
+// =============> Write your prediction here: the code is already declared a variable that can not be changed so the consol.log always be the same 3.
 
 const num = 103;
 
@@ -14,11 +14,15 @@ 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
+// =============> write the output here: 3
 // Explain why the output is the way it is
-// =============> write your explanation here
+// =============> write your explanation here: the code is already declared a variable that can not be changed in the
+//                                             first place so when ever the process try to access another console.log it will take the same value as before
+//                                             so the consol.log always be the same.
 // Finally, correct the code to fix the problem
-// =============> write your new code here
+// =============> write your new code here: function getLastDigit(num) {
+//                                             return num.toString().slice(-1);
+//                                           }
 
 // 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 +15,10 @@
 // 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
-}
+  const squaredHeight = height * height;
+  const originalBMI = (weight / squaredHeight).toString();
+  let dotIndex = originalBMI.indexOf(".");
+  let bmiWithOneDecimal = originalBMI.slice(0, dotIndex + 2);
+  return bmiWithOneDecimal;
+}
+console.log(`The calculated BMI is ${calculateBMI(78.4, 1.71)}`);

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 toCapitalizedSnakeCase(str) {
+  const toCapitalized = str.toUpperCase().replace(/ /g, "_");
+  return toCapitalized;
+}

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

@@ -4,3 +4,22 @@
 // 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}`;
+}

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

@@ -14,25 +14,26 @@ 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
+// =============> 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
+// =============> write your answer here:it is 0, because totalHours is 0.
 
 // c) What is the return value of pad is called for the first time?
-// =============> write your answer here
+// =============> write your answer here:it is 00, because the function pad will add another 0 if it is less than 2 index.
 
 // 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
+// =============> write your answer here:it is 1, because the remainingSeconds value will become 1 after it get the remainder of the seconds.
 
 // 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
+// =============> write your answer here:it will be 01,because after going through the function pad it will gain 0 from the front because it is less
+//                                       than 2 index so the return will be 01.