nomanalikhan

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

nomanalikhan

async function asyncFlatMap (arr, asyncFn) {
    return Promise.all(flatten(await asyncMap(arr, asyncFn)))
}

function asyncMap (arr, asyncFn) {
    return Promise.all(arr.map(asyncFn))
}

function flatMap (arr, fn) {
    return flatten(arr.map(fn))