There is a repository on GitHub that you can clone, run and debug if you want to see the code I'm talking about in this article. I've basically taken the code from the previous article and added some extra features. It's those additions are what I'll be explaining in the article.
for i, color in colors {，更多细节参见新收录的资料
Credits and Blame。新收录的资料对此有专业解读
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