Ramda JS 根据索引将数组划分为多个子数组

Question

我想获取一个数组并将其拆分为基于另一个索引数组的子数组字典：

const arr = ["A", "B", "C", "D", "E"];
const indices = [0, 0, 1, 0, 3];
    
// Would like to do something like this:
R.split(indices, array) // { "0": ["A", "B", "D"], "1": ["C"], "3": ["E"] }

在 Ramda 中有一种优雅的方法可以做到这一点吗？

Answer 1

使用R.zip将 arrays 组合成值/索引对数组。 按索引分组，然后仅从对中取值：

 const { pipe, zip, groupBy, last, map, head } = R const fn = pipe( zip, // combine the arrays to an array of value/indice pairs groupBy(last), // group by the indices map(map(head)) // take only the values from the pairs ) const arr = ["A", "B", "C", "D", "E"] const indices = [0, 0, 1, 0, 3] const result = fn(arr, indices) console.log(result)

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