Currying in ML, Python, Javascript

ML

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以SMLNJ为例.

- fun sum x y = x + y;
val sum = fn : int -> int -> int
- val sum2 = sum 2;
val sum2 = fn : int -> int
- sum2 10;
val it = 12 : int

Python

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可以使用functools来实现curry

>>>from functools import partial
>>>def sum(x,y): return x + y
>>>sum2 = partial(sum, 2)
>>>sum2
<functools.partial object at 0x1f2de0>
>>>sum2(10)
12

JavaScript

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http://www.svendtofte.com/code/curried_javascript/