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如何循环json数据并合并具有相同状态id的行?

jsobject json jquery javascript

espresso_coffee · 技术社区 · 7 年前

我有美国参议员的.json文件,每个州有两名参议员。我想循环这个json文件,创建一个新的JS对象,该对象应该将stateID作为键,然后为每个键设置两个属性 name1 name2 . 以下是数据在原始文件中的外观示例:

var senatorData = [{
    state_code: "AK",
    name: "Daniel Sullivan"
  },
  {
    state_code: "AK",
    name: "Lisa Murkowski"
  },
  {
    state_code: "WY",
    name: "Michael Enzi"
  },
  {
    state_code: "WY",
    name: "John Barrasso"
  }
];

$(document).ready(function(){
  loadData();
});

function loadData() {
  if (senatorData) {
    for (var key in senatorData) {
      console.log(senatorData[key]);
    }
  }
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

在示例中,我刚刚展示了原始数据,下面是我想要的:

var senatorDataNew = [
    "AK" = {
         name1: "Daniel Sullivan",
         name2: "Lisa Murkowski"
     },
     "WY" = {
         name1: "Michael Enzi",
         name2: "John Barrasso"
     }
];

名称1 属性的值,如果密钥已存在,则需要保留 姓名2

3 回复 | 直到 7 年前

Matt Grande 7 年前

你在找这样的东西吗?

senatorDataNew = {};    
senatorData.forEach(senator => {
    if (! senatorDataNew[senator.state_code]) {
        senatorDataNew[senator.state_code] = {names: []};
    }

    senatorDataNew[senator.state_code].names.push(senator.name)
});

slider 7 年前

如果只有两名参议员,你可以使用 reduce 设定 name1 或 name2 根据累加器中是否已存在密钥,在密钥旁边的对象中设置属性:

function loadData() {
  if (senatorData) {
    return senatorData.reduce((a, {state_code, name}) => {
      if (state_code in a) a[state_code].name2 = name;
      else a[state_code] = {name1: name};
      return a;
    }, {});
  }
}

var senatorData = [{
    state_code: "AK",
    name: "Daniel Sullivan"
  },
  {
    state_code: "AK",
    name: "Lisa Murkowski"
  },
  {
    state_code: "WY",
    name: "Michael Enzi"
  },
  {
    state_code: "WY",
    name: "John Barrasso"
  }
];

$(document).ready(function(){
  console.log(loadData());
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

Taplar 7 年前

var senatorData = [{
    state_code: "AK",
    name: "Daniel Sullivan"
  },
  {
    state_code: "AK",
    name: "Lisa Murkowski"
  },
  {
    state_code: "WY",
    name: "Michael Enzi"
  },
  {
    state_code: "WY",
    name: "John Barrasso"
  }
];

//convert the object into an object of key (state) and value (names)
senatorData = senatorData.reduce(function(results, senator){
  if (!results[senator.state_code]) results[senator.state_code] = [];
  
  results[ senator.state_code ].push(senator.name);
  return results;
}, {});

console.log(senatorData);

//convert the object into an array of objects
senatorData = Object.keys(senatorData).map(function(state){
  return { state_code: state, names: senatorData[state] };
});

console.log(senatorData);