Question

What does the mystery function do?

function mystery() {
while (noBallsPresent()) {
move();
}
}
JavaScript


Karel moves until it is on a ball


Karel moves once if there is no ball present


Karel moves until it puts down a ball


Karel checks if there is no ball on the current spot and then moves once

Answer 1

The `mystery` function in your provided JavaScript code is designed such that Karel continues to move while there are no balls present.

Here's a breakdown of the function:

- `while (noBallsPresent())`: This line creates a loop that continues to run as long as the condition `noBallsPresent()` returns true (i.e., there are no balls present).
- Inside the loop, the command `move();` instructs Karel to move forward.

Based on this logic, the function effectively makes Karel move in its environment until it encounters a ball, at which point the loop will terminate because `noBallsPresent()` will no longer be true.

Given the options provided, the correct interpretation of what the `mystery` function does is:

**Karel moves until it is on a ball.**