"Accumulate" all the calls to a function in a each iteration of the event loop so that they can be treated together ("insert all" instead of "insert one" for every call, or actually applying only the last "update" of a model for example)

event-loop-accumulator.js

function accumulator(callback){
	let acc = []
	let timeout = null
  
  return (val) =>{
    acc.push(val)
    clearTimeout(timeout)
    timeout = setTimeout(() => {
			callback(acc)
      acc = []
		}, 0)
  }
}