別のオブジェクトのキーに基づいてキーの値を取得

Question

私はオブジェクトの2つの配列を持っており、条件に基づいてキーの値を取得したい。

deltaArrのキーgoogleIdに基づいて、古い配列の値をidにしたいと考えています。 oldArrのgoogleIdと

だから、ときgoogleId deltaArrの試合、私は、アレイ内のそのインデックスと店でoldArrのidを取得したいです。

function getPrimaryKeys(deltaArr, oldArr){ 
    console.log('deltaArr........ ', JSON.stringify(deltaArr, null, 2)); 
    console.log('oldArr........ ', JSON.stringify(oldArr, null, 2)); 
    var primaryKeys = []; 
    for(var i = 0; i< deltaArr.length; i++){ 
     if(deltaArr[i].hasOwnProperty('googleId') && deltaArr[i].googleId == oldArr[i].googleId){ 
      primaryKeys.push(oldArr[i].id); 
     } 
    } 
    return primaryKeys; 
} 

deltaArr：

[ 
    { 
     "contact": { 
      "address": { 
      "home": "", 
      "office": "" 
      }, 
      "email": { 
      "home": "", 
      "other": "", 
      "work": "" 
      }, 
      "im": { 
      "aim": "", 
      "icq": "", 
      "skype": "" 
      }, 
      "phone": { 
      "cell": "+91-1234-567-891", 
      "home": "", 
      "work": "", 
      "e164": "+911234567891" 
      } 
     }, 
     "googleId": "2bf235bd8a846814", 
     "createdDate": "2016-12-31T13:03:09.203Z", 
     "name": "Test1", 
     "profileData": "" 
    } 
] 

oldArr：

[ 
    { 
    "contact": { 
     "address": { 
     "home": "", 
     "office": "" 
     }, 
     "email": { 
     "home": "", 
     "other": "", 
     "work": "" 
     }, 
     "im": { 
     "aim": "", 
     "icq": "", 
     "skype": "" 
     }, 
     "phone": { 
     "cell": "+91-1234-567-896", 
     "e164": "+911234567896", 
     "home": "", 
     "work": "" 
     } 
    }, 
    "createdDate": "2016-12-31T12:59:08.959Z", 
    "googleId": "3e98af288ff825f7", 
    "id": "2e4009de-4bce-4f02-b33c-415ad688f1c2", 
    "name": "Test6", 
    "profileData": "" 
    }, 
    { 
    "contact": { 
     "address": { 
     "home": "", 
     "office": "" 
     }, 
     "email": { 
     "home": "", 
     "other": "", 
     "work": "" 
     }, 
     "im": { 
     "aim": "", 
     "icq": "", 
     "skype": "" 
     }, 
     "phone": { 
     "cell": "+91-1234-567-890", 
     "e164": "+911234567890", 
     "home": "", 
     "work": "" 
     } 
    }, 
    "createdDate": "2016-12-31T12:59:08.952Z", 
    "googleId": "2bf235bd8a846814", 
    "id": "411b2507-64a1-46d6-812b-8216446676e3", 
    "name": "Test0", 
    "profileData": "" 
    }, 
    { 
    "contact": { 
     "address": { 
     "home": "", 
     "office": "" 
     }, 
     "email": { 
     "home": "", 
     "other": "", 
     "work": "" 
     }, 
     "im": { 
     "aim": "", 
     "icq": "", 
     "skype": "" 
     }, 
     "phone": { 
     "cell": "+91-1234-567-895", 
     "e164": "+911234567895", 
     "home": "", 
     "work": "" 
     } 
    }, 
    "createdDate": "2016-12-31T12:59:08.951Z", 
    "googleId": "20735d9e8df44423", 
    "id": "46f579cb-dbda-49f1-8eb6-df621692e023", 
    "name": "Test5", 
    "profileData": "" 
    } 
] 

あなたは"googleId": "2bf235bd8a846814"が表示された場合の配列の両方に存在します。 Iは、上記を試したが、そのはundefined

注与える：両方の配列の長さは、動的データに基づいて変化します。この場合、私はあなたが知らgoogleIdが発見された場合、結果の配列にidを追加googleIdのハッシュテーブルを使用してold配列を確認することができidまたはgoogleId

Answer 1

の値が何であるかを知ることはできません。

ハッシュテーブルは、googleIdをキーとし、trueを値とするオブジェクトです。

{ 
    "2bf235bd8a846814": true 
} 

これはold配列のチェックに必要です。ハッシュが'2bf235bd8a846814'の場合、ハッシュテーブルはtrueを返し、それ以外の場合はundefiedを返します。これはif条件の偽値です。

function getId(delta, old) { 
 
    var googleId = Object.create(null), 
 
     result = []; 
 

 
    delta.forEach(function (a) { 
 
     googleId[a.googleId] = true; 
 
    }); 
 
    console.log(googleId); 
 
    old.forEach(function(a) { 
 
     if (googleId[a.googleId]) { 
 
      result.push(a.id); 
 
     } 
 
    }); 
 
    return result; 
 
} 
 

 
var deltaArray = [{ "contact": { "address": { "home": "", "office": "" }, "email": { "home": "", "other": "", "work": "" }, "im": { "aim": "", "icq": "", "skype": "" }, "phone": { "cell": "+91-1234-567-891", "home": "", "work": "", "e164": "+911234567891" } }, "googleId": "2bf235bd8a846814", "createdDate": "2016-12-31T13:03:09.203Z", "name": "Test1", "profileData": "" }], 
 
    oldArray = [{ "contact": { "address": { "home": "", "office": "" }, "email": { "home": "", "other": "", "work": "" }, "im": { "aim": "", "icq": "", "skype": "" }, "phone": { "cell": "+91-1234-567-896", "e164": "+911234567896", "home": "", "work": "" } }, "createdDate": "2016-12-31T12:59:08.959Z", "googleId": "3e98af288ff825f7", "id": "2e4009de-4bce-4f02-b33c-415ad688f1c2", "name": "Test6", "profileData": "" }, { "contact": { "address": { "home": "", "office": "" }, "email": { "home": "", "other": "", "work": "" }, "im": { "aim": "", "icq": "", "skype": "" }, "phone": { "cell": "+91-1234-567-890", "e164": "+911234567890", "home": "", "work": "" } }, "createdDate": "2016-12-31T12:59:08.952Z", "googleId": "2bf235bd8a846814", "id": "411b2507-64a1-46d6-812b-8216446676e3", "name": "Test0", "profileData": "" }, { "contact": { "address": { "home": "", "office": "" }, "email": { "home": "", "other": "", "work": "" }, "im": { "aim": "", "icq": "", "skype": "" }, "phone": { "cell": "+91-1234-567-895", "e164": "+911234567895", "home": "", "work": "" } }, "createdDate": "2016-12-31T12:59:08.951Z", "googleId": "20735d9e8df44423", "id": "46f579cb-dbda-49f1-8eb6-df621692e023", "name": "Test5", "profileData": "" }]; 
 

 
console.log(getId(deltaArray, oldArray));

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

Answer 2

あなたはそので古い配列をハッシュ可能性（地図を使って）値をgoogle_id、およびデルタ配列の.map()呼び出しのためのコンテキストとしてそのを養う：

function collect(delta, old) { 
 
    return delta.map(function (d) { 
 
     return this.get(d.googleId).id 
 
    }, new Map(old.map (o => [o.googleId, o]))); 
 
} 
 

 
var deltaArr = [{ "contact": { "address": { "home": "", "office": "" }, "email": { "home": "", "other": "", "work": "" }, "im": { "aim": "", "icq": "", "skype": "" }, "phone": { "cell": "+91-1234-567-891", "home": "", "work": "", "e164": "+911234567891" } }, "googleId": "2bf235bd8a846814", "createdDate": "2016-12-31T13:03:09.203Z", "name": "Test1", "profileData": "" }]; 
 
var oldArr = [{ "contact": { "address": { "home": "", "office": "" }, "email": { "home": "", "other": "", "work": "" }, "im": { "aim": "", "icq": "", "skype": "" }, "phone": { "cell": "+91-1234-567-896", "e164": "+911234567896", "home": "", "work": "" } }, "createdDate": "2016-12-31T12:59:08.959Z", "googleId": "3e98af288ff825f7", "id": "2e4009de-4bce-4f02-b33c-415ad688f1c2", "name": "Test6", "profileData": "" }, { "contact": { "address": { "home": "", "office": "" }, "email": { "home": "", "other": "", "work": "" }, "im": { "aim": "", "icq": "", "skype": "" }, "phone": { "cell": "+91-1234-567-890", "e164": "+911234567890", "home": "", "work": "" } }, "createdDate": "2016-12-31T12:59:08.952Z", "googleId": "2bf235bd8a846814", "id": "411b2507-64a1-46d6-812b-8216446676e3", "name": "Test0", "profileData": "" }, { "contact": { "address": { "home": "", "office": "" }, "email": { "home": "", "other": "", "work": "" }, "im": { "aim": "", "icq": "", "skype": "" }, "phone": { "cell": "+91-1234-567-895", "e164": "+911234567895", "home": "", "work": "" } }, "createdDate": "2016-12-31T12:59:08.951Z", "googleId": "20735d9e8df44423", "id": "46f579cb-dbda-49f1-8eb6-df621692e023", "name": "Test5", "profileData": "" }]; 
 

 
console.log(collect(deltaArr, oldArr));