react-reveal/src/lib/throttle.js

Really simple way to add reveal on scroll animation to your React app.

export default function throttle(callback, wait, context = this) {
  let timeout = null
  let callbackArgs = null

  const later = () => {
    callback.apply(context, callbackArgs)
    timeout = null
  }

  return function() {
    if (!timeout) {
      callbackArgs = arguments
      timeout = setTimeout(later, wait)
    }
  }
}