有个推友发起了一个挑战：JS challenge
- you have a list of 1000 items
- you have an async function
process(item) - you need to process all items
- it needs to be done concurrently, but not more than 25 at a time
- collect items with errors
what's the cleanest way to do this? libraries allowed
我试了下，用 7 行代码搞定了：
rxjs 用来处理复杂数据流很方便。tweet