javascriptAsync race conditionMedium

Total calculation logs object instead of value

Time: 0:00

What it should do

sumDelayed(nums) should add up numbers that each arrive asynchronously, resolving to the total.

What goes wrong

sumDelayed([1, 2, 3]) resolves to "0[object Promise][object Promise][object Promise]" instead of 6.

Hints

This is an async and race conditions bug

A missing await, results in the wrong order, and updates that overwrite each other under load.