让我们看一下怎样对一个通用函数建模的范例，使用parse_line作为例子。

Let's look at an example of how to model a global function, using parse_line as an example.

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了解一个诸如函数式编程的新范例的一大挑战是了解其新的构建块，并将这些构建块看作是问题的潜在解决方案。

One of the challenges of learning a new paradigm like functional programming is learning the new building blocks and "seeing" them peek out of problems as a potential solution.

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许多函数式范例都是围绕列表构建，因为大多数编程的最终目的就是解决列表问题。

Many functional paradigms are built around lists because much of programming boils down to dealing with lists of things.

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