代码之家 › 专栏 › 技术社区 › SBB

JavaScript将指定的单个对象转换为数组

arrays javascript

SBB · 技术社区 · 8 年前

我正在处理一些 JSON

我的问题是,在处理循环时,必须尝试并处理这一问题。

示例数据:

// Single result from DB
var obj = {
  "records": {
    "recordID": 1,
    "recordName": 'test'
  }
}

// Multiple results from DB
var obj = {
  "records": [{
    "recordID": 1,
    "recordName": 'test'
  }, {
    "recordID": 2,
    "recordName": 'test again'
  }]
}

由于我的一些对象相当大,我正在尝试提出一个函数,当我在处理之前从数据库中获取对象时,可以使用该函数初始化对象。

// Input 
var obj = {
    "records": {
        "recordID": 1,
        "recordName": 'test'
    },
    "photos": {
        "photoID": 1,
        "photoName": 'test flower'
    },
    "leaveMeAlone": {
        "nopeID": 1,
        "nopeName": 'tester'
    }
}


function convertToArray(obj) {

    var keysToArray = ['records', 'photos'];

    // Loop over keys
    for (var k in obj) {

        // Properties
        if (obj.hasOwnProperty(k)) {

            // This key is in our array. 
            if (keysToArray.indexOf(k) > -1) {

                // If this is a single object, turn it into an array containing a single object
                if (!Array.isArray(obj[k])) {
                    // Turn this value into an array of the single object
                    /* Stuck Here */
                }
            }
        }
    }

    /* Return 
    
    var obj = {
        "records": [{
            "recordID": 1,
            "recordName": 'test'
        }],
        "photos": [{
            "photoID": 1,
            "photoName": 'test flower'
        }],
        "leaveMeAlone": {
            "nopeID": 1,
            "nopeName": 'tester'
        }
    }
    */

}

// run
convertToArray(obj);

3 回复 | 直到 8 年前

Ankush Jain 8 年前

你可以使用下面我创建的方法。它将检查对象是否为数组。否则,它会将对象放入数组中并返回。

function convertToArray(obj) {
    if (obj.records instanceof Array) {
        return obj.records;
    } else {
        return [obj.records];
    }
}

https://jsfiddle.net/r4otdrq0/

Nina Scholz 8 年前

您可以通过将给定属性转换为数组(如果还不是数组的话)来采取迭代和递归方法。

如果所有键都是唯一的,则可以使用提前返回,方法是删除数组的属性,或将路径从深度优先更改为广度优先搜索。

function convert(object, keys) {
    Object.keys(object).forEach(function (k) {
        if (object[k] && typeof object[k] === 'object') {
            convert(object[k], keys);
        }
        if (keys.indexOf(k) !== -1 && !Array.isArray(object[k])) {
            object[k] = [object[k]];
        }
    });
}

var object = { records: { recordID: 1, recordName: 'test' }, photos: { photoID: 1, photoName: 'test flower' }, leaveMeAlone: { nopeID: 1, nopeName: 'tester' }, nested: { convert: { foo: 1, bar: 2 } } },
    keys = ['records', 'photos', 'convert'];

convert(object, keys);

console.log(object);

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

skirtle 8 年前

注意,我已经替换了内联的值,因此传入的对象发生了变化。除此之外,我希望这是非常不言自明的。

// Input 
var obj = {
    "records": {
        "recordID": 1,
        "recordName": 'test'
    },
    "photos": {
        "photoID": 1,
        "photoName": 'test flower'
    },
    "leaveMeAlone": {
        "nopeID": 1,
        "nopeName": 'tester'
    }
}

function convertToArray(obj) {
    var keysToArray = ['records', 'photos'];

    keysToArray.forEach(function(key) {
        if (key in obj && !Array.isArray(obj[key])) {
            obj[key] = [obj[key]];
        }
    });

    return obj;
}

console.log(convertToArray(obj));

function convertToArray(obj, keysToConvert) {
  if (Array.isArray(obj)) {
    obj.forEach(function(entry) {
      convertToArray(entry, keysToConvert);
    });
  }
  else if (obj && typeof obj === 'object') {
    Object.keys(obj).forEach(function(key) {
      if (keysToConvert.indexOf(key) !== -1 && !Array.isArray(obj[key])) {
        obj[key] = [obj[key]];
      }

      convertToArray(obj[key], keysToConvert);
    });
  }

  return obj;
}

var obj = {
  "data": {
    "VersionForTarget": "1",
    "rules": {
      "rule": {
        "RuleParentID": "84",
        "RuleVersionID": "2",
        "MappedValue": "1",
        "ProcessingOrder": "1",
        "MetaInsertUtc": "2017-03-03T17:54:34.643",
        "Value": "Recorded",
        "IsRuleRetired": "0",
        "UserImpactCount": "27130",
        "attributes": {
          "attribute": {
            "AttributeID": "2",
            "AttributeName": "Role",
            "attributeDetails": {
              "attributeDetail": [{
                  "RuleDetailID": "10964",
                  "AttributeID": "2",
                  "OperatorID": "3",
                  "AttributeValue": "172",
                  "RuleParentID": "84",
                  "Value": "Account Manager",
                  "IsValueRetired": "0",
                  "OperatorName": "In List",
                  "SqlOperator": "IN"
                },
                {
                  "RuleDetailID": "10966",
                  "AttributeID": "2",
                  "OperatorID": "3",
                  "AttributeValue": "686",
                  "RuleParentID": "84",
                  "Value": "Agent",
                  "IsValueRetired": "0",
                  "OperatorName": "In List",
                  "SqlOperator": "IN"
                }
              ]
            }
          }
        }
      }
    }
  }
}

console.log(convertToArray(obj, ['rule', 'attribute', 'attributeDetail']))