Sheffield | 25-ITP-SEP | Jak Rhodes-Smith | Sprint 2 | coursework/sprint-2

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

@@ -1,13 +1,18 @@
 // Predict and explain first...
-//  =============> write your prediction here
+// The function is supposed to convert the first character of a string to uppercase
+// There will be a syntax error due to the redeclaration of the variable 'str'
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
+capitalise("hello");
+
+// function capitalise(str) {
+//   let str = `${str[0].toUpperCase()}${str.slice(1)}`;
+//   return str;
+// }
+
+// The error occurred because 'str' was declared again with 'let', which is not allowed.
 
 function capitalise(str) {
-  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
-  return str;
+  return `${str[0].toUpperCase()}${str.slice(1)}`;
 }
-
-// =============> write your explanation here
-// =============> write your new code here

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

@@ -1,20 +1,26 @@
 // Predict and explain first...
+// The function is intended to take a decimal number and convert it to a percentage (e.g. 1.5 => 150%)
 
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// There will be a syntax error due to the redeclaration of the variable 'decimalNumber'
 
 // 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
+// Redeclaring the variable decimalNumber causes a syntax error
+// The parameter decimalNumber cannot be logged to the console as it is a parameter and holds no value until the function is called
 
 // Finally, correct the code to fix the problem
-// =============> write your new code here
+function convertToPercentage(decimalNumber) {
+  return `${decimalNumber * 100}%`;
+}
+
+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...
 
 // this function should square any number but instead we're going to get an error
 
-// =============> write your prediction of the error here
+// A number is not a valid parameter (Syntax Error)
 
-function square(3) {
-    return num * num;
-}
+// function square(3) {
+//     return num * num;
+// }
 
-// =============> write the error message here
+// Failed to instrument Sprint-2/1-key-errors/2.js
+//    7 |
+// >  8 | function square(3) {
+//      |                 ^ SyntaxError: Unexpected token (8:16)
+//    9 |     return num * num;
+//   10 | }
+//   11 |
+//     at <rootDir>/Sprint-2/1-key-errors/2.js:8:16
 
-// =============> explain this error message here
+// parameter names cannot start with a digit
 
 // 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 +1,19 @@
 // Predict and explain first...
 
-// =============> write your prediction here
+// The result of a * b will be printed to the console
+// Since the function does not return any value, it will return undefined
 
-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
+// Because the function is evaluated before the string is printed to the console, it will log the result of a * b to the console first, but because it does not return a value, the next console.log of the string will print 'The result of multiplying 10 and 32 is undefined'
 
 // 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 +1,18 @@
 // Predict and explain first...
-//  =============> write your prediction here
+// The function is intended to take 2 arguments and return the sum
+// it will return undefined
 
+// function sum(a, b) {
+//   return;
+//   a + b;
+// }
+
+// console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
+
+// it currently has a return statement that ends the function prematurely, causing it to return undefined
+// Finally, correct the code to fix the problem
 function sum(a, b) {
-  return;
-  a + b;
+  return a + b;
 }
 
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
-
-// =============> write your explanation here
-// Finally, correct the code to fix the problem
-//  =============> write your new code here

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

@@ -1,24 +1,35 @@
 // Predict and explain first...
+// The function intends to take a number and return it's last digit
+// Each call of the function will return the same result
 
 // Predict the output of the following code:
-// =============> Write your prediction here
+// 'The last digit of 42 is 3'
+// 'The last digit of 105 is 3'
+// 'The last digit of 806 is 3'
 
-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
+// '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
+// Because the function was not correctly defined to accept an argument, It was using a fixed variable instead
+
 // Finally, correct the code to fix the problem
-// =============> 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
+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)}`);

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
-}
+  const bmi = weight / height ** 2;
+  return Number(bmi.toFixed(1));
+}
+
+console.log(calculateBMI(70, 1.73));

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

@@ -14,3 +14,10 @@
 // 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.replace(/\s+/g, "_").toUpperCase();
+}
+
+console.log(toUpperSnakeCase("hello there"));
+console.log(toUpperSnakeCase("lord of the rings"));

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) {
+  penceString = penceString.endsWith("p")
+    ? penceString.slice(0, -1)
+    : penceString;
+
+  const paddedString = penceString.padStart(3, "0");
+
+  const pounds = paddedString.slice(0, -2);
+
+  const pence = paddedString.slice(paddedString.length - 2);
+
+  return `£${pounds}.${pence}`;
+}
+
+// Example calls
+console.log(toPounds("399p"));
+console.log(toPounds("5p"));
+console.log(toPounds("123"));
+console.log(toPounds("4567"));

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

@@ -17,18 +17,21 @@ 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:
+console.log(formatTimeDisplay(61));
 
 // 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 call to pad is for remaining seconds, which is 1 (since 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) returns "01" because padStart(2, "0") adds a leading zero

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

@@ -4,8 +4,18 @@
 
 function formatAs12HourClock(time) {
   const hours = Number(time.slice(0, 2));
+  const minutes = time.slice(3, 5);
+
+  if (hours === 0) {
+    return `12:${minutes} am`;
+  }
+
+  if (hours === 12) {
+    return `${hours}:${minutes} pm`;
+  }
+
   if (hours > 12) {
-    return `${hours - 12}:00 pm`;
+    return `${hours !== 12 ? hours - 12 : hours}:${minutes} pm`;
   }
   return `${time} am`;
 }
@@ -23,3 +33,75 @@ console.assert(
   currentOutput2 === targetOutput2,
   `current output: ${currentOutput2}, target output: ${targetOutput2}`
 );
+
+// Midnight
+const outMidnight = formatAs12HourClock("00:00");
+const targetMidnight = "12:00 am";
+console.assert(
+  outMidnight === targetMidnight,
+  `current output: ${outMidnight}, target output: ${targetMidnight}`
+);
+
+// Noon
+const outNoon = formatAs12HourClock("12:00");
+const targetNoon = "12:00 pm";
+console.assert(
+  outNoon === targetNoon,
+  `current output: ${outNoon}, target output: ${targetNoon}`
+);
+
+// 1 PM
+const out13 = formatAs12HourClock("13:00");
+const target13 = "1:00 pm";
+console.assert(
+  out13 === target13,
+  `current output: ${out13}, target output: ${target13}`
+);
+
+// 12:59 PM
+const out1259 = formatAs12HourClock("12:59");
+const target1259 = "12:59 pm";
+console.assert(
+  out1259 === target1259,
+  `current output: ${out1259}, target output: ${target1259}`
+);
+
+// 11:59 PM
+const out2359 = formatAs12HourClock("23:59");
+const target2359 = "11:59 pm";
+console.assert(
+  out2359 === target2359,
+  `current output: ${out2359}, target output: ${target2359}`
+);
+
+// 01:00 AM
+const out1 = formatAs12HourClock("01:00");
+const target1 = "01:00 am";
+console.assert(
+  out1 === target1,
+  `current output: ${out1}, target output: ${target1}`
+);
+
+// 10:30 AM
+const out1030 = formatAs12HourClock("10:30");
+const target1030 = "10:30 am";
+console.assert(
+  out1030 === target1030,
+  `current output: ${out1030}, target output: ${target1030}`
+);
+
+// 15:45 PM
+const out1545 = formatAs12HourClock("15:45");
+const target1545 = "3:45 pm";
+console.assert(
+  out1545 === target1545,
+  `current output: ${out1545}, target output: ${target1545}`
+);
+
+// Edge: single digit hour
+const outSingle = formatAs12HourClock("7:45");
+const targetSingle = "7:45 am";
+console.assert(
+  outSingle === targetSingle,
+  `current output: ${outSingle}, target output: ${targetSingle}`
+);