console.clear()
async function main() {

    const delay = time=>new Promise(resolve => setTimeout(()=>resolve(), time))
    const functionInvocationsObservable = new Rx.Subject()
        .bufferTime(/* buffer time*/ 500, /* restart buffer, -1 means never */ -1,  /* maxBufferSize*/ 3)
        .filter(x => x.length > 0)
//         .subscribe(console.log)

    const batchify = func => {
        functionInvocationsObservable.subscribe(x => {
            console.log(x)
            func(x)
         })

        return function() {
            functionInvocationsObservable.next(...arguments)
        }
    }

    const foo = batchify(x=>x * 2)

    for (let i = 0; i <= 10; i++) {
        await delay(100)
        console.info(`invoked with: ${i}`)
        foo(i)
    }

    await delay(100)
    console.info(`invoked with: ${28}`)
    foo(28)
    foo(30)
    foo(42)

}

main()