难道仅仅是避免继承的一种方法吗? [英] Is currying just a way to avoid inheritance?

问题描述

因此，我对curring(基于SO问题)的理解是，它允许您部分设置函数的参数并作为结果返回截断的"函数.

So my understanding of currying (based on SO questions) is that it lets you partially set parameters of a function and return a "truncated" function as a result.

如果您的毛发函数很大，则需要10个参数，看起来像

If you have a big hairy function takes 10 parameters and looks like

function (location, type, gender, jumpShot%, SSN, vegetarian, salary) {
    //weird stuff
}

，并且您想要一个子集"功能，该功能可以让您处理除jumpShot%以外的所有其他内容的预设，您是否不应该打破从原始功能继承的类呢?

and you want a "subset" function that will let you deal with presets for all but the jumpShot%, shouldn't you just break out a class that inherits from the original function?

我想我要寻找的是这种模式的用例.谢谢！

I suppose what I'm looking for is a use case for this pattern. Thanks!

推荐答案

在javascript中，我确实使用了回调函数(因为在调用它们(从调用者那里)后，它们无法传递任何参数

In javascript I do currying on callback functions (because they cannot be passed any parameters after they are called (from the caller)

所以像这样:

...
var test = "something specifically set in this function";
onSuccess: this.returnCallback.curry(test).bind(this),

// This will fail (because this would pass the var and possibly change it should the function be run elsewhere
onSuccess: this.returnCallback.bind(this,test),
...

// this has 2 params, but in the ajax callback, only the 'ajaxResponse' is passed, so I have to use curry
returnCallback: function(thePassedVar, ajaxResponse){
   // now in here i can have 'thePassedVar', if 
}

我不确定它是否足够详细或连贯...但是通过currying基本上可以让您预填充"参数并返回一个已经填充了数据的裸函数调用(而不是要求您在某些地方填充该信息)另一点)

I'm not sure if that was detailed or coherent enough... but currying basically lets you 'prefill' the parameters and return a bare function call that already has data filled (instead of requiring you to fill that info at some other point)

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