高阶函数可将多个函数应用于一个参数 [英] Higher order function to apply many functions to one argument

问题描述

我想要一个高阶函数的通用名称，该函数将函数列表应用于单个参数.

I want the common name of a higher order function that applies a list of functions onto a single argument.

从这个意义上讲，它是map的反面. map接受一个函数和一个参数列表，并将该函数应用于整个列表.在Python中，可能看起来像这样

In this sense it is a converse of map. map takes a function and a list of arguments and applies that function to the entire list. In Python it might look like this

map = lambda fn, args: [fn(arg) for arg in args]

我正在考虑的功能相同，但具有替代参数作为列表类型

I'm thinking of the function that does the same but has the alternate argument as a list type

??? = lambda fns, arg: [fn(arg) for fn in fns]

我怀疑此功能存在并且具有通用名称.什么事?

I suspect that this function exists and has a common name. What is it?

推荐答案

实际上，您所描述的不是map的反义词，而只是以另一种方式应用的map.考虑例如

Actually, what you describe is not the converse of map, but just map applied in another way. Consider, e.g.,

map(lambda f: f(2), [lambda x: x + 1, lambda x: x, lambda x: x * x])

实际上将三个函数(加1，标识和平方)应用于参数2.所以你想要的只是

which in effect applies three functions (plus 1, identity, and squaring) to the argument 2. So what you wanted is just

alt_map = lambda x, fns: map(lambda f: f(x), fns)

仍然是普通地图.

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