Wait for a certain amount quiet time before calling function execution. It is purposely slow down the response for user's interaction.
It is not necessary to response that fast or this response become costly to do. Say, typeahead call to fetch suggestion only after user stop typing; Mouseover show sub menu only when users's mouse stop on a item...
const waitUI = require('wait-ui');
waitUI(fn, msec, scope);
// set up component
[component].onMouseover(waitUI(this.handleMouseover, 300, this))
// the very last mouseover event happen 300ms ago
handleMouseover(event) {
// this is this
...
}