javascriptAsync race conditionHard

Sequential data arriving out of order

Time: 0:00

What it should do

labelAll(items) should return the names in the same order they were passed in, regardless of how long each one takes.

What goes wrong

labelAll([{name:"a",ms:20},{name:"b",ms:1}]) returns ["b","a"] — the order is wrong whenever a later item finishes first.

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.