javascript - for循环检查三个数组的索引是否匹配，如果匹配则创建不同的对象

Question

我需要检查三个不同的数组以查看它们的索引是否匹配。如果它们匹配，则创建一个对象。第三个数组中的项目可能较少。如果第三个数组的项目较少，则前两个数组应继续检查其索引是否匹配并创建不同的对象。与“seqIds”数组中的索引匹配的数组索引应添加“seqId”作为属性，其他两个数组中与“seqId”索引不匹配的索引不会获得“seqId”属性。

Edit: The invIds and invTypes arrays will always be the same length.

数组示例:

invIds:   [1, 2, 3, 4];
invTypes: ["A", "B", "C", "D"];
seqIds:   [10, 11];

invs 数组应包含以下对象:

invs: [
       {
         "invId": 1,
         "invType": "A",
         "seqId": 10
        },
        {
          "invId": 2,
          "invType": "B",
          "seqId": 11
        },
        {
         "invId": 3,
         "invType": "C"
        },
        {
         "invId": 4,
         "invType": "D"
        }
      ];

我写的for循环:

var invs = [];

for (var invI = 0; invI < this.state.invIds.length; invI++) {
  for (var invT = 0; invT < this.state.invTypes.length; invT++) {
    for (var invS = 0; invS < this.state.invSeqIds.length; invS++) {
      if (invI === invT && invT === invS) {
        invs.push({
          seqId: this.state.invSeqIds[invS],
          userId: this.state.invIds[invI],
          invTypeCd: this.state.invTypes[invT],
          importId: randInt
        });
      }
    }
    if (invI === invT) {
      invs.push({
        userId: this.state.invIds[invI],
        invTypeCd: this.state.invTypes[invT],
        importId: randInt
      });
    }
  }
}

我编写的 for 循环没有正确添加到数组中，它执行以下操作:

{"invId": 1, "invType": "A", "seqId": 10}
{"invId": 1, "invType": "A"}
{"invId": 2, "invType": "B", "seqId": 11}
{"invId": 2, "invType": "B"}
{"invId": 3, "invType": "C"}
{"invId": 4, "invType": "D"}

Answer 1

解决此问题的另一种方法是使用 while-statement与运算符(operator)一起in检查源数组的索引。

let invIds = [1, 2, 3, 4],
  invTypes = ["A", "B", "C", "D"],
  seqIds = [10, 11],
  result = [],
  i = 0;

while (i in invIds && i in invTypes) {
  result[i] = Object.create(null);
  result[i].invId = invIds[i];
  result[i].invType = invTypes[i];
  if (i in seqIds) result[i].seqId = seqIds[i];
  i++;
}

console.log(result);

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