Function debounce

src/scripts/main.js:13–25

(fn, duration)

 * @returns {Function}
 */
const debounce = function(fn, duration) {

	let timeout = null

	return (...args) => {

		clearTimeout(timeout)

		timeout = setTimeout(() => fn(...args), duration)

	}

}

/**
 * Returns all active instances from an array.