What is the difference between a do-while loop and a while loop?

What is the difference between a do-while loop and a while loop?

A do-while loop executes its block of code at least once before checking the condition, while a while loop checks the condition first.

Can you give me an example of each?

Sure! In a do-while loop, you might write:

let i = 0;
do {
  console.log(i);
  i++;
} while (i < 5);

In a while loop, it would look like this:

let j = 0;
while (j < 5) {
  console.log(j);
  j++;
}

What happens if the condition is false in a do-while loop?

If the condition is false in a do-while loop, the code block will still execute once before exiting the loop.

Are there any performance differences between the two?

Generally, there are no significant performance differences; the choice depends on whether you need the code to run at least once.