Fire JS Event Listener Once

Manuel Matuzović recently tweeted about a little-known parameter that will fire JS event listener once.
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Check out this little-known parameter for the click addEventListener that makes it possible to only allow it to fire once.

document.querySelector('.once').addEventListener('click', () => {
  alert('once')
}, {
  once: true
});

For more details, check out the EventTarget.addEventListener() documentation on MDN web docs.

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