The code uses the Math.min() function to find the smallest of two numbers. The function first divides the numbers by 2 to get the front and back flips. It then calculates the minimum of these two flips.
function pageCount(n, p) {
var frontFlip = Math.floor(p/2);
var backFlip = Math.floor((n/2)-frontFlip);
var result = Math.min(frontFlip, backFlip);
return result;
}