London | 25-ITP-September | Ammad Ur Rehman | Sprint 2 | 03 Complete Sprint 2 Coursework

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

@@ -1,6 +1,10 @@
 // Predict and explain first...
 //  =============> write your prediction here
 
+// I predict that the function will capitalise the first character of the string
+// And then return a string using string interpolation using the first character of the string
+// and a slice of the remaining characters of the string excluding the first character.
+
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
 
@@ -10,4 +14,13 @@ function capitalise(str) {
 }
 
 // =============> write your explanation here
+
+// An error is thrown because of the variable name collision. The function has a parameter called `str`
+// but in the body of the function, a variable `str` is declared and that conflicts with the parameter.
+
 // =============> write your new code here
+
+function upperCased(string) {
+  const capitalised = `${string[0].toUpperCase()}${string.slice(1)}`;
+  return capitalised;
+}

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

@@ -3,6 +3,9 @@
 // Why will an error occur when this program runs?
 // =============> write your prediction here
 
+// Because of the variable name collision. The function parameter is called decimalNumber
+// but another decimalNumber is declared inside the body of the function.
+
 // Try playing computer with the example to work out what is going on
 
 function convertToPercentage(decimalNumber) {
@@ -16,5 +19,11 @@ console.log(decimalNumber);
 
 // =============> write your explanation here
 
+// The console prints: SyntaxError: Identifier 'decimalNumber' has already been declared
+
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+
+function percentaged(decimalNumber) {
+  return `${decimalNumber * 100}%`;
+}

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

@@ -5,16 +5,26 @@
 
 // =============> write your prediction of the error here
 
+// The function will not execute because of the undefined variable `num` and the parameter `3`,
+// which is not allowed to be defined with just numbers. There must be letters to define a variable
+// but can begins with numbers.
+
 function square(3) {
     return num * num;
 }
 
 // =============> write the error message here
 
+// SyntaxError: Unexpected number
+
 // =============> explain this error message here
 
+// It's referring to the function parameter `3`
+
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
 
-
+function squared(value) {
+    return value * value;
+}

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

@@ -2,6 +2,8 @@
 
 // =============> write your prediction here
 
+// The function prints to the console by multiplying the parameter `a` and `b`
+
 function multiply(a, b) {
   console.log(a * b);
 }
@@ -10,5 +12,12 @@ console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
 // =============> write your explanation here
 
+// I missed line 11, the function does indeed prints to the console but returns nothing
+// which explains `undefined` in the string interpolation of the function
+
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+
+function product(a, b) {
+  return a * b;
+}

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

@@ -1,6 +1,8 @@
 // Predict and explain first...
 //  =============> write your prediction here
 
+// It will not say `undefined` but will not add parameter `a` and `b`
+
 function sum(a, b) {
   return;
   a + b;
@@ -9,5 +11,12 @@ function sum(a, b) {
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
 // =============> write your explanation here
+
+// The console prints: The sum of 10 and 32 is undefined
+
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+
+function add(a, b) {
+  return a + b;
+}

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

@@ -3,10 +3,12 @@
 // Predict the output of the following code:
 // =============> Write your prediction here
 
+// It will convert 103 number into a String representation and then will either do no manipulations or invert the string
+
 const num = 103;
 
-function getLastDigit() {
-  return num.toString().slice(-1);
+function getLastDigit(digit) {
+  return digit.toString().slice(-1);
 }
 
 console.log(`The last digit of 42 is ${getLastDigit(42)}`);
@@ -22,3 +24,7 @@ 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() has no parameters and referenced a globally scoped constant `num`.
+// In order for it to `work properly`, a parameter is required and referencing it in order to
+// return an expected value

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

@@ -15,5 +15,8 @@
 // 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
+  const result = weight / Math.pow(height, 2);
+  const bmiString = result.toFixed(1);
+  return Number(bmiString);
+}

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 toUpperSnakeCase(string) {
+  return String(string).toUpperCase().replaceAll(" ", "_");
+}

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

@@ -4,3 +4,23 @@
 // 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

@@ -11,6 +11,9 @@ function formatTimeDisplay(seconds) {
   return `${pad(totalHours)}:${pad(remainingMinutes)}:${pad(remainingSeconds)}`;
 }
 
+const number = 61;
+console.log(formatTimeDisplay(number));
+
 // 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
 
@@ -19,16 +22,26 @@ function formatTimeDisplay(seconds) {
 // 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"
+
 // 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"

Sprint-2/5-stretch-extend/format-time.js

@@ -3,11 +3,18 @@
 // Your task is to write tests for as many different groups of input data or edge cases as you can, and fix any bugs you find.
 
 function formatAs12HourClock(time) {
-  const hours = Number(time.slice(0, 2));
-  if (hours > 12) {
-    return `${hours - 12}:00 pm`;
+  let hours = Number(time.slice(0, 2));
+  const minutes = time.slice(-2);
+
+  if (hours === 24) {
+    hours = 0;
   }
-  return `${time} am`;
+
+  const period = hours < 12 ? "am" : "pm";
+  hours = hours % 12 || 12;
+  const paddedHours = String(hours).padStart(2, "0");
+
+  return `${paddedHours}:${minutes} ${period}`;
 }
 
 const currentOutput = formatAs12HourClock("08:00");
@@ -23,3 +30,31 @@ console.assert(
   currentOutput2 === targetOutput2,
   `current output: ${currentOutput2}, target output: ${targetOutput2}`
 );
+
+const currentOutput3 = formatAs12HourClock("00:00");
+const targetOutput3 = "12:00 am";
+console.assert(
+  currentOutput3 === targetOutput3,
+  `current output: ${currentOutput3}, target output: ${targetOutput3}`
+);
+
+const currentOutput4 = formatAs12HourClock("24:00");
+const targetOutput4 = "12:00 am";
+console.assert(
+  currentOutput4 === targetOutput4,
+  `current output: ${currentOutput4}, target output: ${targetOutput4}`
+);
+
+const currentOutput5 = formatAs12HourClock("12:00");
+const targetOutput5 = "12:00 pm";
+console.assert(
+  currentOutput5 === targetOutput5,
+  `current output: ${currentOutput5}, target output: ${targetOutput5}`
+);
+
+const currentOutput6 = formatAs12HourClock("09:41");
+const targetOutput6 = "09:41 am";
+console.assert(
+  currentOutput6 === targetOutput6,
+  `current output: ${currentOutput6}, target output: ${targetOutput6}`
+);