什么是“咖喱"? [英] What is 'Currying'?
问题描述
我在几篇文章和博客中看到了对柯里化函数的引用,但我找不到很好的解释(或至少一个有意义的解释!)
I've seen references to curried functions in several articles and blogs but I can't find a good explanation (or at least one that makes sense!)
推荐答案
柯里化是指将带有多个参数的函数分解为一系列函数,而每个函数只采用一个参数.这是 JavaScript 中的示例:
Currying is when you break down a function that takes multiple arguments into a series of functions that each take only one argument. Here's an example in JavaScript:
function add (a, b) {
return a + b;
}
add(3, 4); // returns 7
这是一个函数,它接受两个参数 a 和 b,并返回它们的总和.我们现在将柯里化这个函数:
This is a function that takes two arguments, a and b, and returns their sum. We will now curry this function:
function add (a) {
return function (b) {
return a + b;
}
}
这是一个函数,它接受一个参数 a
,并返回一个接受另一个参数 b
的函数,该函数返回它们的总和.
This is a function that takes one argument, a
, and returns a function that takes another argument, b
, and that function returns their sum.
add(3)(4);
var add3 = add(3);
add3(4);
第一条语句返回 7,就像 add(3, 4)
语句一样.第二个语句定义了一个名为 add3
的新函数,它将把 3 添加到它的参数中.(有些人可能会称之为闭包.)第三条语句使用 add3
操作将 3 与 4 相加,结果再次产生 7.
The first statement returns 7, like the add(3, 4)
statement. The second statement defines a new function called add3
that will add 3 to its argument. (This is what some may call a closure.) The third statement uses the add3
operation to add 3 to 4, again producing 7 as a result.
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