##### ###### ##### ### # # ### # # ###### ## ## ## ## ## ## ## # # # # # ## ##### #### ##### # # # # # # # #### ## # ## ## ## ## # # # # # ## ## # ###### ## ### # ### # ######
##### ###### ##### ### # # ### # # ###### ## ## ## ## ## ## ## # # # # # ## ##### #### ##### # # # # # # # #### ## # ## ## ## ## # # # # # ## ## # ###### ## ### # ### # ######
Most common async mistake
This bug is so common it deserves its own unit:
const data = fetchData() // Missing await! console.log(data.length) // TypeError: undefined
fetchData returns a Promise, not the data. Without await, data is the Promise object. Adding await fixes it:
const data = await fetchData()
When you see unexpected undefined values, check for missing awaits first.
