const a = 20;
const b = 40;

function diff (title, handler)
{
    console.time(title);

    for (let offset = 0; offset <= 100_000_000; ++offset)
    {
        handler();
    }

    console.timeEnd(title);
}

diff('math', () => (Math.abs(a + b) + Math.abs(a - b)) / 2);
diff('func', () => Math.max(a, b));
diff('if',   () => a < b ? a : b);