在 Javascript/nodejs 中将数组转换为对象答案

【问题标题】：Convert Array to Object in Javascript/nodejs在 Javascript/nodejs 中将数组转换为对象
【发布时间】：2021-09-20 01:07:04
【问题描述】：

我想将下面的对象转换为预期的对象。我正在使用 Javascript/node js 代码来执行此操作，但无法实现。我尝试了很多方法，但都没有实现。

原文：


{
  "0": {
    "buildVersion": {
      "0": "6.15",
      "1": "6.16"
    },
    "market": "CORE"
  },
  "1": {
    "buildVersion": {
      "0": "6.15",
      "1": "6.16"
    },
    "market": "US"
  },
  "2": {
    "buildVersion": {
      "0": "6.15.1",
      "1": "6.16.2"
    },
    "market": "CA"
  }
}

预期：

[
  {
    "market": "CORE",
    "buildVersion": [
      "6.15",
      "6.16"
    ]
  },
  {
    "market": "US",
    "buildVersion": [
      "6.15",
      "6.16"
    ]
  },
  {
    "market": "CA",
    "buildVersion": [
      "6.15.1",
      "6.16.2"
    ]
  }
]

【问题讨论】：

标签： javascript node.js arrays object

【解决方案1】：

最简单的方法是在类数组对象上调用Object.values。

const data = {
  "0": {
    "buildVersion": {
      "0": "6.15",
      "1": "6.16"
    },
    "market": "CORE"
  },
  "1": {
    "buildVersion": {
      "0": "6.15",
      "1": "6.16"
    },
    "market": "US"
  },
  "2": {
    "buildVersion": {
      "0": "6.15.1",
      "1": "6.16.2"
    },
    "market": "CA"
  }
};

const fixed = Object.values(data).map(({ buildVersion, ...rest }) =>
  ({ ...rest,  buildVersion: Object.values(buildVersion) }));

console.log(fixed);

.as-console-wrapper { top: 0; max-height: 100% !important; }

这是一个使用递归的更动态的示例。它会在转换之前检查对象是否类似于数组。

const data = {
  "0": {
    "buildVersion": {
      "0": "6.15",
      "1": "6.16"
    },
    "market": "CORE"
  },
  "1": {
    "buildVersion": {
      "0": "6.15",
      "1": "6.16"
    },
    "market": "US"
  },
  "2": {
    "buildVersion": {
      "0": "6.15.1",
      "1": "6.16.2"
    },
    "market": "CA"
  }
};

const fix = o =>
  typeof o === 'object'
    ? Object.keys(o).every(k => isFinite(k))
      ? Object.entries(o).map(([k, v]) => fix(v))
      : Object.fromEntries(Object.entries(o).map(([k, v]) => [k, fix(v)]))
    : o;

const fixed = fix(data);

console.log(fixed);

.as-console-wrapper { top: 0; max-height: 100% !important; }

【讨论】：

请注意，如果输出数组的顺序必须与原始对象中的键匹配，那么如果以更改键顺序的方式操作对象，这可能会或可能不会起作用。
@cbr 对象键顺序始终按数字顺序从 0 -> MAX_SAFE_INTEGER 开始。写入时顺序无关紧要。
哦，真的吗？谢谢！我不知道！
@cbr 类似整数的键的迭代总是ascending。

【解决方案2】：

如果我们假设对象的键总是从 0 开始并且是连续的（中间没有丢失的数字），您可以只使用 Object.entries()（或 Object.keys() 和索引）来获取键和值并填充他们的数组：

const obj = {
  "0": {
    "buildVersion": {
      "0": "6.15",
      "1": "6.16"
    },
    "market": "CORE"
  },
  "1": {
    "buildVersion": {
      "0": "6.15",
      "1": "6.16"
    },
    "market": "US"
  },
  "2": {
    "buildVersion": {
      "0": "6.15.1",
      "1": "6.16.2"
    },
    "market": "CA"
  }
}

const numberedObjectToArray = (obj) => {
  // Assuming `obj` has contiguous index numbers starting from 0
  return Object.entries(obj).reduce((arr, [key, value]) => {
    const index = parseInt(key, 10);

    arr[index] = value;
    return arr;
  }, []);
};

const array = numberedObjectToArray(obj).map(({ buildVersion, ...o }) => ({
  ...o,
  buildVersion: numberedObjectToArray(buildVersion)
}));

console.log(array);

【讨论】：

非常感谢，您节省了我的时间。

【解决方案3】：

object = {
  "0": {
    "buildVersion": {
      "0": "6.15",
      "1": "6.16"
    },
    "market": "CORE"
  },
  "1": {
    "buildVersion": {
      "0": "6.15",
      "1": "6.16"
    },
    "market": "US"
  },
  "2": {
    "buildVersion": {
      "0": "6.15.1",
      "1": "6.16.2"
    },
    "market": "CA"
  }
};

let output = [];

for (let okey in object) {
    let market = object[okey].market;
  let build = object[okey].buildVersion;
  let buildVersion = [];
  for (let bkey in build){
    buildVersion.push(build[bkey]);
  }
  
  output.push({
   market,
    buildVersion
  });
}

console.log(output);

【讨论】：

【解决方案4】：

var obj= {
  "0": {
    "buildVersion": {
      "0": "6.15",
      "1": "6.16"
    },
    "market": "CORE"
  },
  "1": {
    "buildVersion": {
      "0": "6.15",
      "1": "6.16"
    },
    "market": "US"
  },
  "2": {
    "buildVersion": {
      "0": "6.15.1",
      "1": "6.16.2"
    },
    "market": "CA"
  }
}
const output=[];
Object.values(obj).map(function(curr){
  const {buildVersion,market}= curr;
  output.push({
    market:market,
    buildVersion:Object.values(buildVersion)
  })
});
console.log(output);

【讨论】：