2.js

// Predict and explain first...

// Predict the output of the following code:
// =============> Write your prediction here
// Since getLastDigit() does not declare any parameters, the arguments passed when calling it are going to be ignored
const num = 103;

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)}`);

// 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
// The function getLastDigit() does not have any parameters, but it is being called with arguments:
// getLastDigit(42), getLastDigit(105), and getLastDigit(806). Inside the function, it always uses the global const num, which is set to 103.
// The means every call ignores the last digit of 103. Which the '3'


// Finally, correct the code to fix the problem
// =============> 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