我决定重写命令式程序，以将RaspberryPi gpio输出引脚从命令式转换为功能式。 逻辑包括从传感器获取当前温度并将1/0写入另一个gpio引脚。我可以使用lib来获取温度并控制gpio引脚，因此这是为该过程本身编写功能性逻辑外壳的尝试。 这是我想出的： const {create, env} = require('sanctuary'); const {fork, node, chain, after, value, resolve, map, Future, both} = require('fl...

考虑以下数据帧： set.seed(123) dat1 <- data.frame(Region = rep(c("r1","r2"), each = 100), State = rep(c("NY","MA","FL","GA"), each = 10), Loc = rep(c("a","b","c","d","e","f","g","h"),each = 5), ID = rep(c(1:...

I know I can initialize a Map, and then fill it using a stream. For example, here I use an IntStream of random numbers to populate the key of the predefined map. int initialCapacity = 3; Map < Integer, UUID > map = new HashMap <>( initialCapacity ); IntSt...

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Swift has several high-order functions like map which encourage functional programming paradigms (e.g. chaining functions together). 例如： users // e.g. [User] .map(Person(from:)) // e.g. pro...

我正在尝试使用C ++进行函数式编程，对于初学者来说，一个不错的练习是编写一个计算一组集合的交集的函数。 据我所知，至少可以通过两种方式在功能上解决此任务： 一个递归函数，它与第i个集合和第i + 1 ... n个集合的交点相交； “信号处理”功能，用于过滤出现在所有其他（第2个……第n个）集合中的第一个集合的元素。 也可以以传统方式轻松解决此任务，依次遍历第一个集合的元素，然后遍历所有其他集合，以检查第一个集合的元素是否出现在其余集合中。 我编写了以下代码，以比较两种功能方法和程序方法。 #incl...

I was trying to filter dataframe based on the list of named arguments, thanks to @MkWTF on this post. However, I want to use *args as an argument to loop through then use the filtering function, which means I am going to have a list of filtered dataframe b...