London | 26-ITP-Jan | Divine Mankrado | Sprint 2 | Sprint-2

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

@@ -1,13 +1,18 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> The error will be that the variable str is being redefined within the function. It was already defined when it was passed as an arguement.
 
 // call the function capitalise with a string input
+capitalise("hello world");
 // interpret the error message and figure out why an error is occurring
+// Error message: SyntaxError: Identifier 'str' has already been declared. The error is because the variable str has already been declared.
 
 function capitalise(str) {
   let str = `${str[0].toUpperCase()}${str.slice(1)}`;
   return str;
 }
 
-// =============> write your explanation here
-// =============> write your new code here
+// =============> I've given the variable a new name, newStr, to avoid redclaring the variable.
+// =============> function capitalise(str) {
+//  let newStr = `${str[0].toUpperCase()}${str.slice(1)}`;
+//  return newStr;
+//}

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

@@ -1,7 +1,6 @@
 // Predict and explain first...
-
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// =============> The error will be a syntax error because the variable decimalNumber has already been declared as a parameter. The console log is trying to access decimalNumber which is not within its scope.
 
 // Try playing computer with the example to work out what is going on
 
@@ -14,7 +13,13 @@ function convertToPercentage(decimalNumber) {
 
 console.log(decimalNumber);
 
-// =============> write your explanation here
+// =============> I got a syntax error that the variable is already declared.
 
 // 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 +1,19 @@
 
 // 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
+// =============> The error will be a syntax error. A number is not a valid variable name - variable names cannot start with a number.
 
 function square(3) {
     return num * num;
 }
 
-// =============> write the error message here
+// =============> write the error message here: SyntaxError: Unexpected number. The error is because the variable name cannot start with a number.
 
-// =============> explain this error message here
+// =============> explain this error message here: You cannot begin a variable name with a number
 
 // 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 +1,17 @@
 // Predict and explain first...
 
-// =============> write your prediction here
+// =============> write your prediction here: The function does not return any value so instead of 320 being printed, undefined will be printed instead.
 
 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: It is a logic error as it prints out an unexpected value, undefined.
 
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+//function multiply(a, b) {
+//   return a * b;
+//}

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 does not return any value. The a + b should be before the semi-colon and after the return. It will print undefined instead of 42.
 
 function sum(a, b) {
   return;
@@ -8,6 +8,9 @@ function sum(a, b) {
 
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
-// =============> write your explanation here
+// =============> write your explanation here: It is a logic error as it prints out an unexpected answer, undefined.
 // Finally, correct the code to fix the problem
 //  =============> 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 function getLastDigit doesn't take any parameters, so it will always return the last digit of the number 103, 3.
 
 const num = 103;
 
@@ -14,11 +14,19 @@ 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: 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
+// =============> write your explanation here: The function getLastDigit doesn't take any parameters, so it always returns the last digit of the variable num, which is 103.
 // 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);
+// }
+
+// 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 does not take any parameters, so it always returns the last digit of the variable num, which is 103.

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

@@ -16,4 +16,5 @@
 
 function calculateBMI(weight, height) {
     // return the BMI of someone based off their weight and height
+    return (weight/(height**2)).toFixed(1);
 }

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

@@ -14,3 +14,7 @@
 // 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(str){
+    return str.toUpperCase().split(" ").join("_");
+}

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

@@ -4,3 +4,14 @@
 // 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("100p"));
+console.log(toPounds("30000p"));

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

@@ -17,18 +17,18 @@ function formatTimeDisplay(seconds) {
 // 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
+// =============> 0
 
 // 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 pad call is pad(remainingSeconds), and with 61 seconds input, remainingSeconds = 61 % 60 = 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
+// =============> "01". pad(1) calls toString() to get "1", then padStart(2, "0") pads it to "01"