listen for an event once

JavaScript
// adds an event listener to ab element that will ibly run the callback the first time the event is triggered.

// - use EventTarget.addEventListener() to add an event listener to an element.
// - use {once:true} as options to only run the given callback once.

const listenOnce = (el, e, fn) => {
el.addEventListener(e, fn, { once: true });
};
listenOnce(document.getElementById("test"), "click", () =>
console.log("Hello world")
); // 'Hello world' will only be logged on the first click