JavaScript Question of the Day March 26, 2025

Consider the following code:

let x = 1;
let y = 2;

function main() {
    // call swap function here

    console.log("value of x: " + x);
    console.log("value of y: " + y);
}

main();

Which of the following swap functions can we call so that the values of x and y are successfully swapped?

1. Correct Answer
   Incorrect Answer
   a

   function swap() {
       y = x;
       x = y;
       return x, y;
   }

   JavaScript
2. Correct Answer
   Incorrect Answer
   b

   Pass in the variables x and y to the function:

   function swap(first, second) {
       let temp = first;
       first = second;
       second = temp;
   }

   JavaScript
3. Correct Answer
   Incorrect Answer
   c

   function swap() {
       let temp = x;
       x = y;
       y = temp;
   }

   JavaScript
4. Correct Answer
   Incorrect Answer
   d

   Pass in the variables x and y to the function:

   function swap(first, second) {
       first, second = second, first;
   }

   JavaScript