2.js

// Predict and explain first...

// Predict the output of the following code:
// =============> Write your prediction here
// the output is always going to be '3'

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
// when the function is declared there is no parameters so in the body of function, num refers to global variable which has always the same value, so when we call the function arguments are ignored.  
// 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