使用java脚本删除2d数组中的列列表

Question

我需要删除2d数组中的一些列。列表名为hiddenCols

​

var array = [
  ["a", "b", "c"],
  ["a", "b", "c"],
  ["a", "b", "c"]
]

hiddenCols = [3, 1] // these are pos and not indexes
for (var j = 0; j < array.length; j++) {
  for (var i = 0; i < hiddenCols.length; i++) {

    array[j].splice(hiddenCols[i], hiddenCols[i])
  }
}
console.log(JSON.stringify(array));

​

预期的结果是var array = ["b"，"b"，"b"]；

Answer 1

你可以用Arrya#reduce

​

const arr = [["a", "b", "c"],["a", "b", "c"],["a", "b", "c"]];
const hiddenCols = [3, 1];

let result = arr.reduce((acc, item) => {
  let res = item.filter((_, ind) => hiddenCols.indexOf(ind + 1) == -1);
  acc.push(res)
  return acc;
}, [])

console.log(result);

​

Answer 2

使用Array.map()迭代行，并通过检查位置是否包含在hiddenCol中来筛选项

​

const arr = [["a", "b", "c"],["a", "b", "c"],["a", "b", "c"]]

const hiddenCols = [3, 1]
const result = arr.map(item =>
  item.filter((_, ind) => !hiddenCols.includes(ind + 1))
)

console.log(result)

​