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Slightly faster compute with immediate #1

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Slightly faster compute with immediate #1

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25 changes: 25 additions & 0 deletions index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -74,6 +74,31 @@ app.get('/compute-with-set-immediate', async function computeWSetImmediate(req,
res.send(hash.digest('hex') + '\n');
});

app.get('/compute-with-set-immediate-closure', function computeWSetImmediate(req, res) {
function asyncUpdateHash(n, doneCB) {
const hash = crypto.createHash('sha256');
// Update ongoing hash in JS closure.
function updateHash(i, cb) {
hash.update(randomString());
if (i == n) {
cb(hash);
return;
}

// "Asynchronous recursion".
// Schedule next operation asynchronously.
setImmediate(updateHash.bind(null, i+1, cb));
}

// Start the helper, with CB to call doneCB.
updateHash(1, doneCB);
}

asyncUpdateHash(10e6, function(hash){
res.send(hash.digest('hex') + '\n');
});
});

app.get('/compute-with-next-tick', async function computeWNextTick (req, res) {
log('computing async with nextTick!');

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