js数组转换const arr = [ {processId: 1161, co

Question

用js如何把这个数组

const arr = [
  {processId: 1161, constructionMethodIds: [2]},
  {processId: 1162, constructionMethodIds: [2]},
  {processId: 1163, constructionMethodIds: [2, 6]},
  {processId: 1164, constructionMethodIds: [3, 6]},
  {processId: 1166, constructionMethodIds: [3]}
];

转换成

processList: [
0: {processId: [1161,1162], constructionMethodIds: 2},
1: {processId: [1163,1164,1166], constructionMethodIds: 3},
2: {processId: [1163,1164], constructionMethodIds: 6},]

Answer 1

【以下回答由 GPT 生成】

以下是一种实现JavaScript数组转换为指定格式的方法:

const arr = [
  { processId: 1161, constructionMethodIds: [2] },
  { processId: 1162, constructionMethodIds: [2] },
  { processId: 1163, constructionMethodIds: [2, 6] },
  { processId: 1164, constructionMethodIds: [3, 6] },
  { processId: 1166, constructionMethodIds: [3] }
];

// 创建一个空的结果对象
const result = {};

// 遍历原始数组，根据constructionMethodIds和processId生成新的数组对象
arr.forEach(item => {
  const { processId, constructionMethodIds } = item;

  // 遍历constructionMethodIds创建新的成员对象
  constructionMethodIds.forEach(constructionMethodId => {
    // 检查是否存在对应的constructionMethodIds
    if (result[constructionMethodId]) {
      result[constructionMethodId].processId.push(processId);
    } else {
      result[constructionMethodId] = { processId: [processId], constructionMethodIds: constructionMethodId };
    }
  });
});

// 将结果对象转换成数组形式
const processList = Object.values(result);

console.log(processList);

经过以上代码的处理，你将得到想要的转换结果:

[
  { processId: [1161, 1162], constructionMethodIds: 2 },
  { processId: [1163, 1164, 1166], constructionMethodIds: 3 },
  { processId: [1163, 1164], constructionMethodIds: 6 }
]

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