FP方式的数组嵌套映射

Question

给定以下数组:

const array1 = ["a1", "b1", "c1", "d1"],
      array2 = ["a2", "b2"],
      array3 = ["a3", "b3", "c3"]

是否有任何ramda函数来简化我可以给出一个或多个数组的以下场景？

const nestedMap = map => {
    const result = []

    for(let item1 of array1) 
        for(let item2 of array2)
            for(let item3 of array3)
                    result.push(map(item1, item2, item3))
    return result
}

整个功能如下:

// Sample usage
nestedMap((item1, item2, item3) => `${item1} ${item2} ${item3}`, array1, array2, array3)

我希望避免重新发明轮子.

^{注意:Vanilla javascript或任何其他库都可以接受.我最初谈到ramda,因为它有很多功能,也许我错过了哪些可以帮助解决这个问题}

Answer 1

您可以在此处使用数组的applicative instance来简化R.lift您的函数:

const array1 = ["a1", "b1", "c1", "d1"],
      array2 = ["a2", "b2"],
      array3 = ["a3", "b3", "c3"]

const nestedMap = R.lift((item1, item2, item3) => `${item1} ${item2} ${item3}`)

console.log(nestedMap(array1, array2, array3))

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