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Complete task for the Sprint-2
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‎Sprint-2/1-key-errors/0.js‎

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// Predict and explain first...
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// =============> write your prediction here
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// call the function capitalise with a string input
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// interpret the error message and figure out why an error is occurring
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// Predict: SyntaxError or ReferenceError because `str` is re-declared with `let` inside the function
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// where it already exists as a parameter.
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// Explanation: You cannot use `let` to re-declare a variable that already exists in the same scope.
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// Fix: remove the `let` keyword — just reassign str.
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function capitalise(str) {
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let str = `${str[0].toUpperCase()}${str.slice(1)}`;
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str = `${str[0].toUpperCase()}${str.slice(1)}`;
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return str;
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}
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// =============> write your explanation here
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// =============> write your new code here

‎Sprint-2/1-key-errors/1.js‎

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// Predict and explain first...
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// Why will an error occur when this program runs?
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// =============> write your prediction here
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// Try playing computer with the example to work out what is going on
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// Prediction: Two errors — (1) re-declaring decimalNumber with const inside the function
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// when it is already a parameter shadows and causes a SyntaxError.
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// (2) console.log(decimalNumber) outside the function will throw ReferenceError because
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// decimalNumber is not defined in the outer scope.
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// Explanation: The parameter decimalNumber already exists; const re-declaration is illegal.
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// Also, decimalNumber is not accessible outside the function.
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// Fix: remove the const re-declaration inside the function, and pass a value to the function.
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function convertToPercentage(decimalNumber) {
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const decimalNumber = 0.5;
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const percentage = `${decimalNumber * 100}%`;
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return percentage;
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}
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console.log(decimalNumber);
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// =============> write your explanation here
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// Finally, correct the code to fix the problem
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// =============> write your new code here
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console.log(convertToPercentage(0.5));

‎Sprint-2/1-key-errors/2.js‎

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// Predict and explain first BEFORE you run any code...
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// Prediction: SyntaxError — a function parameter must be a valid identifier, not a literal number.
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// Error: SyntaxError: Unexpected number
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// Explanation: `3` is a number literal and cannot be used as a parameter name.
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// Fix: use a named parameter like `num`.
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// this function should square any number but instead we're going to get an error
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// =============> write your prediction of the error here
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function square(3) {
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return num * num;
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function square(num) {
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return num * num;
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}
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// =============> write the error message here
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// =============> explain this error message here
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// Finally, correct the code to fix the problem
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// =============> write your new code here
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‎Sprint-2/2-mandatory-debug/0.js‎

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// Predict and explain first...
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// =============> write your prediction here
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// Prediction: The template literal will print "undefined" for the function result because
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// multiply uses console.log internally but does not return a value (returns undefined).
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// Explanation: Functions without a return statement return undefined.
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// The outer console.log then interpolates undefined into the string.
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// Fix: replace console.log inside multiply with a return statement.
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function multiply(a, b) {
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console.log(a * b);
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return a * b;
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}
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console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
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// =============> write your explanation here
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// Finally, correct the code to fix the problem
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// =============> write your new code here

‎Sprint-2/2-mandatory-debug/1.js‎

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// Predict and explain first...
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// =============> write your prediction here
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// Prediction: The sum will print "undefined" because return; exits the function
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// immediately without a value, so a + b is never evaluated.
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// Explanation: return; with no expression returns undefined. The a + b on the next
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// line is unreachable dead code.
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// Fix: put a + b on the same line as return.
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function sum(a, b) {
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return;
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a + b;
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return a + b;
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}
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console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
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// =============> write your explanation here
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// Finally, correct the code to fix the problem
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// =============> write your new code here

‎Sprint-2/2-mandatory-debug/2.js‎

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// Predict and explain first...
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// Prediction: All three logs will print "3" (the last digit of the module-level const num = 103)
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// because getLastDigit ignores its parameter and always uses the outer num.
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// Output:
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// The last digit of 42 is 3
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// The last digit of 105 is 3
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// The last digit of 806 is 3
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// Explanation: The function has no parameter, so any argument passed in is discarded.
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// It always reads the outer `num` variable which is 103.
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// Fix: add a parameter to getLastDigit and use it.
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// Predict the output of the following code:
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// =============> Write your prediction here
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const num = 103;
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function getLastDigit() {
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function getLastDigit(num) {
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return num.toString().slice(-1);
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}
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console.log(`The last digit of 42 is ${getLastDigit(42)}`);
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console.log(`The last digit of 105 is ${getLastDigit(105)}`);
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console.log(`The last digit of 806 is ${getLastDigit(806)}`);
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// Now run the code and compare the output to your prediction
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// =============> write the output here
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// Explain why the output is the way it is
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// =============> write your explanation here
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// Finally, correct the code to fix the problem
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// =============> write your new code here
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// This program should tell the user the last digit of each number.
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// Explain why getLastDigit is not working properly - correct the problem

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

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// It should return their Body Mass Index to 1 decimal place
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function calculateBMI(weight, height) {
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// return the BMI of someone based off their weight and height
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return Number((weight / (height * height)).toFixed(1));
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}

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

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// A set of words can be grouped together in different cases.
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function toUpperSnakeCase(str) {
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return str.replaceAll(" ", "_").toUpperCase();
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}
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// For example, "hello there" in snake case would be written "hello_there"
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// UPPER_SNAKE_CASE means taking a string and writing it in all caps with underscores instead of spaces.
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// Implement a function that:
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// Given a string input like "hello there"
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// When we call this function with the input string
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// it returns the string in UPPER_SNAKE_CASE, so "HELLO_THERE"
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// Another example: "lord of the rings" should be "LORD_OF_THE_RINGS"
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// You will need to come up with an appropriate name for the function
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// Use the MDN string documentation to help you find a solution
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// This might help https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/toUpperCase
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console.log(toUpperSnakeCase("hello there")); // "HELLO_THERE"
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console.log(toUpperSnakeCase("lord of the rings")); // "LORD_OF_THE_RINGS"

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

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// In Sprint-1, there is a program written in interpret/to-pounds.js
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function toPounds(penceString) {
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const withoutP = penceString.substring(0, penceString.length - 1);
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const padded = withoutP.padStart(3, "0");
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const pounds = padded.substring(0, padded.length - 2);
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const pence = padded.substring(padded.length - 2).padEnd(2, "0");
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return `£${pounds}.${pence}`;
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}
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// You will need to take this code and turn it into a reusable block of code.
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// You will need to declare a function called toPounds with an appropriately named parameter.
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// You should call this function a number of times to check it works for different inputs
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console.log(toPounds("399p")); // £3.99
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console.log(toPounds("9p")); // £0.09
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console.log(toPounds("50p")); // £0.50
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console.log(toPounds("1000p")); // £10.00

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

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return `${pad(totalHours)}:${pad(remainingMinutes)}:${pad(remainingSeconds)}`;
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}
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// You will need to play computer with this example - use the Python Visualiser https://pythontutor.com/visualize.html#mode=edit
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// to help you answer these questions
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// a) pad is called 3 times per call to formatTimeDisplay (once for hours, minutes, seconds).
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// Questions
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// Call formatTimeDisplay(61):
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// remainingSeconds = 61 % 60 = 1
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// totalMinutes = (61 - 1) / 60 = 1
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// remainingMinutes = 1 % 60 = 1
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// totalHours = (1 - 1) / 60 = 0
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// pad is called with: totalHours=0, remainingMinutes=1, remainingSeconds=1
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// a) When formatTimeDisplay is called how many times will pad be called?
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// =============> write your answer here
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// b) num = 0 (totalHours) when pad is called for the first time.
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// Call formatTimeDisplay with an input of 61, now answer the following:
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// c) pad(0): "0".length < 2, so prepend "0" -> "00". Return value: "00"
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// b) What is the value assigned to num when pad is called for the first time?
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// =============> write your answer here
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// d) num = 1 (remainingSeconds) when pad is called for the last time.
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// It is the last argument passed in the template literal.
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// c) What is the return value of pad is called for the first time?
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// =============> write your answer here
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// d) What is the value assigned to num when pad is called for the last time in this program? Explain your answer
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// =============> write your answer here
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// e) What is the return value of pad when it is called for the last time in this program? Explain your answer
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// =============> write your answer here
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// e) pad(1): "1".length < 2, so prepend "0" -> "01". Return value: "01"

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