And in exchange for writing 67 fewer characters…

Because this…
$('.sandwich').addClass('mustard');
Is a few characters shorter than this…
document.querySelectorAll('.sandwich').forEach((sandwich) => {
        sandwich.classList.add('mustard');
});
And in exchange for writing 67 fewer characters, we sent 87.5 kb of JavaScript to our users.

— The goal isn't to write less code, by Chris Ferdinandi (emphasis mine)