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Another process.nextTick example that shows callbacks aren't intrinically asynchronous.
function doSomething(i, callback) {
console.log(i, 'doSomething before callback');
// this is in fact synchronous, since don't use nextTick
console.log(i, 'doSomething after callback');
process.nextTick(function() {
// you might think this yeilds to the next "doSomething",
// but in fact it runs after everything else is done
console.log(i, 'nextTick');
function onDone() {
console.log(i, 'done');
for (var i = 0; i < 5; i++) {
doSomething(i, onDone);
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