更新时间:2023-02-13 22:31:37
虽然它看起来是一个过程程序,但上面的语法被翻译成一个函数式程序,如下所示:
While it appears to be a procedural program, the above syntax is translated into a functional program, like so:
do { putStrLn "ABCDE" ; putStrLn "12345" }
=>
IO ( s -> case (putStrLn "ABCDE" s) of
( new_s, _ ) -> case (putStrLn "12345" new_s) of
( new_new_s, _) -> ((), new_new_s))
也就是说,一系列嵌套函数有一个独特的世界参数贯穿它们,程序性地"对原始函数的调用进行排序.此设计支持将命令式编程编码为函数式语言.
That is, a series of nested functions that have a unique world parameter threaded through them, sequencing calls to primitive functions "procedurally". This design supports an encoding of imperative programming into a functional language.
对基于此设计的语义决策的***介绍是 "The Awkward Squad" 论文,
The best introduction to the semantic decisions underlying this design is "The Awkward Squad" paper,