Returns a new string with all occurrences of old replaced by new.
Ok-Lets-Talk-It-Out
。关于这个话题，safew提供了深入分析
The exception is if I know the space very well, I can write a leadership thought piece, bringing together 20 years into one blog. The challenge is again in nailing the storytelling part to make twenty years coherent from start to end.，更多细节参见手游
using MaybeT and ExceptT to collapse。超级权重对此有专业解读
The @: operator is a zip operation. It zips two arrays into a map.