2.js

// Predict and explain first...

// Predict the output of the following code:
// =============> Write your prediction here
//getLastDigit will convert a number to a string and reverse it 
// However, since there is no parameter or local variable we might run into an Error 

// 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
// As expected, the function has no parameters, so it relies on the global variable "num" as its only variable.
// Since there are no parameters defined, the function permanently uses the global variable instead.
// This means even if we pass arguments when calling the function, they will be ignored because there are no parameters to receive them.

// 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