Simple code showing Async and Sync features in Node.js

async-node.js

function syncfunc(a, callbackfn){
        callbackfn("this is sync");
}
syncfunc('temp', function(r){ console.log(r) });
console.log("done sync func");

function asyncfunc(a, callbackfn){
        process.nextTick( () => callbackfn("this is async") );
}
asyncfunc('temp', function(r){ console.log(r) });
console.log("done async func");

// code output 
/*
this is sync
done sync func
done async func
this is async
*/