A small async-await puzzle

async-puzzle.js

/**
A small puzzle from a stupid bug today - what do you need to fill in at `XXX` to make the second assertion true?


I learn quiet a bit more `async` `await` from this…. before this I intuitively sees it async and await as countering each other:
• `async` wraps a promise layer
• `await` unwraps a promise layer
but this bug certainly expose my misunderstanding….

*/

const assert = require("assert");

const idFunction = async function(x) {
  return x;
};

const arggggg = async function() {
  const foo = 123;
  const foo2 = await idFunction(foo);
  assert(foo === foo2);
  // yay!

  const bar = XXX
  const bar2 = await idFunction(bar);
  assert(bar !== bar2);
  // boo
};

arggggg();