疑问

FP如何解决 并发问题的?
FP如何处理不同类型之间的关系(继承)

基本模型

代换模型 环境模型 元循环模型

Building Abstraction

with Procedures

The ability to visualize the consequences of the actions under consideration is crucial to becoming an expert pro- grammer, just as it is in any synthetic, creative activity.

Modularity, Objects and State

##Assignment , local state

Programming without any use of assignments, as we did throughout the first two chapters of this book, is accordingly known as functional programming.

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