返回函数，修改输入函数的值 [英] Return function that modifies the value of the input function

问题描述

如何使一个函数具有输入功能并返回一个三倍值的函数.这是我要寻找的一些伪代码. Python或Scala中的具体示例将不胜感激.

How can I make a function that is given a function as input and returns a function with the value tripled. Here is some pseudo code for what I'm looking for. Concrete examples in Python or Scala would be appreciated.

def f(int x):
    return x ** 2

def tipleFunc(Function g)
    return 3 * g

Function newFunc = tripleFunc(f)
print newFunc(5)

推荐答案

def f(x):
    return x ** 2

def tripleFunc(g):
    return lambda *args: 3 * g(*args)

newFunc = tripleFunc(f)
print newFunc(5)

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