throttle.js

const throttle = (fn, threshold) => {

	let last
	let timeout

	return (...args) => {

		const now = Date.now()
		const shouldDelay = last && now < last + threshold
		const delay = shouldDelay === true ? threshold - (now - last) : 0

		const execute = () => {
			last = now
			fn(...args)
		}

		clearTimeout(timeout)

		timeout = setTimeout(execute, delay)

	}

}

Example:

const fn = (text) => console.log(text)
const tfn = throttle(fn, 200)

tfn('hello') // hello
setTimeout(() => tfn('hello'), 100)
setTimeout(() => tfn('hello'), 110) // hello (after 200ms)