Curry lodash pick 函数没有按预期工作

Question

我是 Lodash curry 函数的新手，我正在努力弄清楚为什么 currying 某些 Lodash 函数（例如 pick）不起作用？

var object = { 'a': 1, 'b': '2', 'c': 3 };
 
_.pick(object, ['a', 'c']);
// => { 'a': 1, 'c': 3 }
// works fine

_.curry(_.pick)(object)(['a', 'c']);
// => TypeError: _.curry(...)(...) is not a function

为什么第二个示例与第一个示例的输出不同？非常感谢您的帮助！

Answer 1

似乎 _.curry() 无法推断 _.pick() 函数所需的参数数量（参数数量）。手动添加_.pick()函数(2)的arity：

const object = { 'a': 1, 'b': '2', 'c': 3 };

const curriedPick = _.curry(_.pick, 2); // <- add the arity
 
console.log(curriedPick(object)(['a', 'c']));

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Curry lodash pick 函数没有按预期工作

Curry lodash pick function doesn't work as expected

javascript

lodash

currying