从数组合并到对象后的Javascript

Question

const arrays = [
  [123, "string1"],
  [4564564, "string2"],
  [392341231, "string3"],
  [1665342, "String4", 334934543, "string5"]
];

const s = arrays.reduce((acc, val) => {
  return acc.concat(val);
});

// output: 
// [123, "string1", 4564564, "string2", 392341231, "string3", 1665342, "String4", 334934543, "string5"]

压平数组后，输出是一个数字一个字符串，我试图使用reduce来制作一个像

{
123: "string1",
4564564: "string2",
392341231: "string3",
1665342:  "String4",
334934543: "string5"
}

.reduce(function(acc, cur, i) {
  acc[cur] = cur;
  return acc;
}, {});

输出错误，如何在reduce中分离number和string？谢谢

Answer 1

您需要保留键和值。迭代每个子数组，将第二项(值)分配到第一项(键)处的累加器上:

const arrays = [
  [123, "string1"],
  [4564564, "string2"],
  [392341231, "string3"],
  [1665342, "String4", 334934543, "string5"]
];

const obj = arrays.reduce((a, subarr) => {
  for (let i = 0; i < subarr.length; i += 2) {
    a[subarr[i]] = subarr[i + 1];
  }
  return a;
}, {});
console.log(obj);