async-gotcha.js

async function a(){
  console.log("a");
  b();
  console.log("b done");
}

async function b(){
  console.log("starting b");
  await Promise.resolve(res => setTimeout(() => res()), 1000);
  console.log("finishing b");
}

a();

/*

logs:

a
starting b
b done
finishing b

since the call to b() above should be `await b();`, even though b awaits the promise inside of it, a will not 
await b's completion unless you tell it to.  It's crucial to understand that b is literally returning a promise, and that

await b();

is the equivalent of 

Promise.resolve(b()).then(result => { 
  //rest of your function
})

while b() is just, well, b(), where the promise created in `b` is fired but never waited on.

*/