Ramda JS 根據索引將數組划分為多個子數組

Question

我想獲取一個數組並將其拆分為基於另一個索引數組的子數組字典：

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 中有一種優雅的方法可以做到這一點嗎？

Answer 1

使用R.zip將 arrays 組合成值/索引對數組。 按索引分組，然后僅從對中取值：

 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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