本文不关心特定的实现细节；相反，它是讨论设计备选方案的意见书。
This article is not concerned with specific implementation details; rather it is a position paper dealing with design alternatives.
如果内置基本函数在任何时间都可用，则与创建自定义代码相比，它是较好的设计备选方案。
Any time a built-in primitive function is available, that will be a better design alternative than creating custom code.
您会发现设计阶段是一个迭代式的循环过程，包括设计、构建原型和评估设计备选方案。
You'll explore the design phase as an iterative, cyclical process of designing, prototyping, and evaluating design alternatives.
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