Question

我尝试映射一些JSON数据并将所有属性设置为true。

我知道您可以为此使用map函数，但是通过设置JSON的方式，数组中的每个对象都有一个键名。

因此，当我运行map函数时，它将所有键名都设置为false，而不是对象本身内部的属性。

这是JSON数据：

{
    "Presentations": {
        "Instant": false,
        "Daily": false,
        "WeeklySummary": false,
        "ContentTypeId": 5
    },
    "Articles": {
        "Instant": true,
        "Daily": false,
        "WeeklySummary": true,
        "ContentTypeId": 1
    },
    "Blogs": {
        "Instant": true,
        "Daily": false,
        "WeeklySummary": true,
        "ContentTypeId": 61
    },
    "NewsBriefs": {
        "Instant": false,
        "Daily": false,
        "WeeklySummary": false,
        "ContentTypeId": 2
    },
    "SpecialInsights": {
        "Instant": false,
        "Daily": false,
        "WeeklySummary": false,
        "ContentTypeId": 50
    }
}

这是我尝试的地图函数，其中data指的是上面的JSON：

Object.entries(data).map(([key, value]) => {
     return value === true;
});

这反过来将返回一个包含五个项的数组，其值为false：

[false,false,false,false,false]

我试图做的是将任何错误的值翻转为true。

Answer 1

您也可以像这样简单地使用嵌套的forEach-

    const a = {
      "Presentations": {
        "Instant": false,
        "Daily": false,
        "WeeklySummary": false,
        "ContentTypeId": 5
    },
    "Articles": {
        "Instant": true,
        "Daily": false,
        "WeeklySummary": true,
        "ContentTypeId": 1
    },
    "Blogs": {
        "Instant": true,
        "Daily": false,
        "WeeklySummary": true,
        "ContentTypeId": 61
    },
    "NewsBriefs": {
        "Instant": false,
        "Daily": false,
        "WeeklySummary": false,
        "ContentTypeId": 2
    },
    "SpecialInsights": {
        "Instant": false,
        "Daily": false,
        "WeeklySummary": false,
        "ContentTypeId": 50
    }
}
    
    Object.keys(a).forEach(ele => {
    	Object.keys(a[ele]).forEach(childEle => {a[ele][childEle] = true});
    })
    
    console.log(a);

Answer 2

您不需要映射任何内容

var arr = your_json;
for(a in arr){
    arr[a]['Instant'] = true;
    arr[a]['Daily'] = true;
    arr[a]['WeeklySummary'] = true;
}

如果您不知道属性

for(a in arr){
    for(e in arr[a]){
        !arr[a][e] ? arr[a][e] = true : null
    }
}

Answer 3

使用递归：

function flip(o) {
  for (k of Object.keys(o)) {
    if (typeof o[k] === "object") {
      flip(o[k])
    }
    if (o[k] === false) {
      o[k] = true;
    }
  }
}



const o = {
    "Presentations": {
        "Instant": false,
        "Daily": false,
        "WeeklySummary": false,
        "ContentTypeId": 5
    },
    "Articles": {
        "Instant": true,
        "Daily": false,
        "WeeklySummary": true,
        "ContentTypeId": 1
    },
    "Blogs": {
        "Instant": true,
        "Daily": false,
        "WeeklySummary": true,
        "ContentTypeId": 61
    },
    "NewsBriefs": {
        "Instant": false,
        "Daily": false,
        "WeeklySummary": false,
        "ContentTypeId": 2
    },
    "SpecialInsights": {
        "Instant": false,
        "Daily": false,
        "WeeklySummary": false,
        "ContentTypeId": 50
    }
}

flip(o);
console.log(o);

Answer 4

根据您的ES版本和所需的浏览器支持，这里有两种不同的处理方法。

var data = {
    "Presentations": {
        "Instant": false,
        "Daily": false,
        "WeeklySummary": false,
        "ContentTypeId": 5
    },
    "Articles": {
        "Instant": true,
        "Daily": false,
        "WeeklySummary": true,
        "ContentTypeId": 1
    },
    "Blogs": {
        "Instant": true,
        "Daily": false,
        "WeeklySummary": true,
        "ContentTypeId": 61
    },
    "NewsBriefs": {
        "Instant": false,
        "Daily": false,
        "WeeklySummary": false,
        "ContentTypeId": 2
    },
    "SpecialInsights": {
        "Instant": false,
        "Daily": false,
        "WeeklySummary": false,
        "ContentTypeId": 50
    }
};

/* ES5 */
var outterKeys = Object.keys(data);
for(var o = 0; o < outterKeys.length; o++){
  var outterObject = data[outterKeys[o]];
  var innerKeys = Object.keys(outterObject);
  for(var i = 0; i < innerKeys.length; i++){
    var innerObject = outterObject[innerKeys[i]];
    if (!innerObject){
      data[outterKeys[o]][innerKeys[i]] = true;
    }
  }
}

console.log('es5', data);

/* ES6 */
data = {
    "Presentations": {
        "Instant": false,
        "Daily": false,
        "WeeklySummary": false,
        "ContentTypeId": 5
    },
    "Articles": {
        "Instant": true,
        "Daily": false,
        "WeeklySummary": true,
        "ContentTypeId": 1
    },
    "Blogs": {
        "Instant": true,
        "Daily": false,
        "WeeklySummary": true,
        "ContentTypeId": 61
    },
    "NewsBriefs": {
        "Instant": false,
        "Daily": false,
        "WeeklySummary": false,
        "ContentTypeId": 2
    },
    "SpecialInsights": {
        "Instant": false,
        "Daily": false,
        "WeeklySummary": false,
        "ContentTypeId": 50
    }
};

Object.keys(data).forEach((o) => {
  Object.keys(data[o]).forEach((i) => {
    if (!data[o][i]){
      data[o][i] = true
    }
  })
});
console.log('es6', data);

如何将对象数组的所有属性设置为true？

4 个答案: