It is better to have 100 functions operate on one data structure than 10 functions on 10 data structures.
The best performance improvement is the transition from the nonworking state to the working state.
亲爱的朋友,我们是太阳和月亮;我们是海洋和陆地。我们的目的不是成为对方,而是认识对方,学会看到对方,并为对方所是的那个人而尊敬他:彼此的对立和补充。