如何将对象中的特定元素检索到不同的数组中

Question

我有这个 allData 数组，其中包含对象。 我需要根据每个元素在 allData 中的键类型将“数据”对象存储到客户、地址或存储数组中。 这就是我到目前为止所拥有的。 但是当我运行它时，它仍然指出数组没有值。

var allData = [
        {type:"store", data:{store_id: 297, name: "Scotiabank - Main Branch", address_id: 1023}},
        {type:"store", data:{store_id: 614, name: "Scotiabank - Hamilton", address_id: 1984}},
        {type:"store", data:{store_id: 193, name: "Scotiabank - Mississauga", address_id: 1757}},
        {type:"customer", data:{customer_id: 26, store_id:297, first_name: "Dave", last_name: "Bennett", email: "dbennett@gmail.com", address_id: 4536, add_date: null}},
        {type:"customer", data:{customer_id: 59, store_id:193, first_name: "John", last_name: "Stevens", email: "jstevens22@hotmail.com", address_id: 2473, add_date: null}},
        {type:"customer", data:{customer_id: 29, store_id:614, first_name: "Sarah", last_name: "Pym", email: "spym99@hotmail.com", address_id: 1611, add_date: null}},
        {type:"customer", data:{customer_id: 63, store_id:297, first_name: "Steven", last_name: "Edwards", email: "steven2231@hotmail.com", address_id: 1836, add_date: null}},
        {type:"customer", data:{customer_id: 71, store_id:614, first_name: "Martin", last_name: "Scott", email: "mdog33@gmail.com", address_id: 2727, add_date: null}},
        {type:"customer", data:{customer_id: 24, store_id:614, first_name: "Jonathan", last_name: "Pym", email: "jjpym@yahoo.ca", address_id: 1611, add_date: null}},
        {type:"customer", data:{customer_id: 36, store_id:193, first_name: "Kaitlyn", last_name: "Adams", email: "katy38@hotmail.com", address_id: 5464, add_date: null}},
        {type:"customer", data:{customer_id: 73, store_id:297, first_name: "Melissa", last_name: "Bennett", email: "mbennett@gmail.com", address_id: 4536, add_date: null}},         
        {type:"address", data:{address_id: 1023, address: "2895 Yonge St.", city:"Toronto", province:"ON", postal_code:"L4C02G"}},
        {type:"address", data:{address_id: 1984, address: "3611 Main St. West", city:"Hamilton", province:"ON", postal_code:"R5O8H5"}},
        {type:"address", data:{address_id: 1757, address: "1177 Ontario St. Unit 8", city:"Mississauga", province:"ON", postal_code:"L9H6B3"}},
        {type:"address", data:{address_id: 4536, address: "3945 John St.", city: "Ajax", province: "ON", postal_code: "L7M4T9"}},
        {type:"address", data:{address_id: 2473, address: "391 Baker St. Apt 231", city: "Mississauga", province: "ON", postal_code: "M4T8S3"}},
        {type:"address", data:{address_id: 1611, address: "183 City Ct.", city: "Hamilton", province: "ON", postal_code: "J3T9V2"}},
        {type:"address", data:{address_id: 1836, address: "67 Rhymer Ave.", city: "Stouffville", province: "ON", postal_code: "L3C8H4"}},
        {type:"address", data:{address_id: 2727, address: "287 Brant St. Apt 4A", city: "Waterdown", province: "ON", postal_code: "R93G3P"}},
        {type:"address", data:{address_id: 5464, address: "11 New St. Apt 2B", city: "Brampton", province: "ON", postal_code: "L694R7"}},
    ];
    
    var CustomerDB = {
      customers:[],
       addresses:[],
       stores:[],
      insertData:function(allData){
        for (let i = 0; i<allData.length;i++){
          if (allData.type[i] == "store"){
            stores.push(allData[i].data);
            
          }
          if (allData.type[i] == "customer"){
            customers.push(allData[i].data);
          }
          if (allData.type[i] == "address"){
            customers.push(allData[i].data);
          }
        }
        
      }
     
    };

Answer 1

 var allData = [ {type:"store", data:{store_id: 297, name: "Scotiabank - Main Branch", address_id: 1023}}, {type:"store", data:{store_id: 614, name: "Scotiabank - Hamilton", address_id: 1984}}, {type:"store", data:{store_id: 193, name: "Scotiabank - Mississauga", address_id: 1757}}, {type:"customer", data:{customer_id: 26, store_id:297, first_name: "Dave", last_name: "Bennett", email: "dbennett@gmail.com", address_id: 4536, add_date: null}}, {type:"customer", data:{customer_id: 59, store_id:193, first_name: "John", last_name: "Stevens", email: "jstevens22@hotmail.com", address_id: 2473, add_date: null}}, {type:"customer", data:{customer_id: 29, store_id:614, first_name: "Sarah", last_name: "Pym", email: "spym99@hotmail.com", address_id: 1611, add_date: null}}, {type:"customer", data:{customer_id: 63, store_id:297, first_name: "Steven", last_name: "Edwards", email: "steven2231@hotmail.com", address_id: 1836, add_date: null}}, {type:"customer", data:{customer_id: 71, store_id:614, first_name: "Martin", last_name: "Scott", email: "mdog33@gmail.com", address_id: 2727, add_date: null}}, {type:"customer", data:{customer_id: 24, store_id:614, first_name: "Jonathan", last_name: "Pym", email: "jjpym@yahoo.ca", address_id: 1611, add_date: null}}, {type:"customer", data:{customer_id: 36, store_id:193, first_name: "Kaitlyn", last_name: "Adams", email: "katy38@hotmail.com", address_id: 5464, add_date: null}}, {type:"customer", data:{customer_id: 73, store_id:297, first_name: "Melissa", last_name: "Bennett", email: "mbennett@gmail.com", address_id: 4536, add_date: null}}, {type:"address", data:{address_id: 1023, address: "2895 Yonge St.", city:"Toronto", province:"ON", postal_code:"L4C02G"}}, {type:"address", data:{address_id: 1984, address: "3611 Main St. West", city:"Hamilton", province:"ON", postal_code:"R5O8H5"}}, {type:"address", data:{address_id: 1757, address: "1177 Ontario St. Unit 8", city:"Mississauga", province:"ON", postal_code:"L9H6B3"}}, {type:"address", data:{address_id: 4536, address: "3945 John St.", city: "Ajax", province: "ON", postal_code: "L7M4T9"}}, {type:"address", data:{address_id: 2473, address: "391 Baker St. Apt 231", city: "Mississauga", province: "ON", postal_code: "M4T8S3"}}, {type:"address", data:{address_id: 1611, address: "183 City Ct.", city: "Hamilton", province: "ON", postal_code: "J3T9V2"}}, {type:"address", data:{address_id: 1836, address: "67 Rhymer Ave.", city: "Stouffville", province: "ON", postal_code: "L3C8H4"}}, {type:"address", data:{address_id: 2727, address: "287 Brant St. Apt 4A", city: "Waterdown", province: "ON", postal_code: "R93G3P"}}, {type:"address", data:{address_id: 5464, address: "11 New St. Apt 2B", city: "Brampton", province: "ON", postal_code: "L694R7"}}, ]; var CustomerDB = { customers: [], addresses: [], stores: [], insertData: function (allData) { //it is not necessary to add function, over here... You can try "Object.setPrototypeOf(CustomerDB, {insertData: function (allData) {}});" this after defining CustomerDB; this.customers = []; this.addresses = []; this.stores = []; for (let i = 0; i < allData.length; i++) { if (allData[i].type == "store") { this.stores.push(allData[i].data); } if (allData[i].type == "customer") { this.customers.push(allData[i].data); } if (allData[i].type == "address") { this.customers.push(allData[i].data); } } } } CustomerDB.insertData(allData); console.log(CustomerDB);

Answer 2

只需在循环中将allData.type[i]更改为allData[i].type 。 由于allData.type[i]将检查当前迭代中的对象是否具有名为type的属性，该属性也具有当前迭代作为属性。 基本上，这就是您要评估的内容：

allData.type['{type:"store", data:{store_id: 297, name: "Scotiabank - Main Branch", address_id: 1023}}'] == 'theValue'

解决方案：

 var allData = [ {type:"store", data:{store_id: 297, name: "Scotiabank - Main Branch", address_id: 1023}}, {type:"store", data:{store_id: 614, name: "Scotiabank - Hamilton", address_id: 1984}}, {type:"store", data:{store_id: 193, name: "Scotiabank - Mississauga", address_id: 1757}}, {type:"customer", data:{customer_id: 26, store_id:297, first_name: "Dave", last_name: "Bennett", email: "dbennett@gmail.com", address_id: 4536, add_date: null}}, {type:"customer", data:{customer_id: 59, store_id:193, first_name: "John", last_name: "Stevens", email: "jstevens22@hotmail.com", address_id: 2473, add_date: null}}, {type:"customer", data:{customer_id: 29, store_id:614, first_name: "Sarah", last_name: "Pym", email: "spym99@hotmail.com", address_id: 1611, add_date: null}}, {type:"customer", data:{customer_id: 63, store_id:297, first_name: "Steven", last_name: "Edwards", email: "steven2231@hotmail.com", address_id: 1836, add_date: null}}, {type:"customer", data:{customer_id: 71, store_id:614, first_name: "Martin", last_name: "Scott", email: "mdog33@gmail.com", address_id: 2727, add_date: null}}, {type:"customer", data:{customer_id: 24, store_id:614, first_name: "Jonathan", last_name: "Pym", email: "jjpym@yahoo.ca", address_id: 1611, add_date: null}}, {type:"customer", data:{customer_id: 36, store_id:193, first_name: "Kaitlyn", last_name: "Adams", email: "katy38@hotmail.com", address_id: 5464, add_date: null}}, {type:"customer", data:{customer_id: 73, store_id:297, first_name: "Melissa", last_name: "Bennett", email: "mbennett@gmail.com", address_id: 4536, add_date: null}}, {type:"address", data:{address_id: 1023, address: "2895 Yonge St.", city:"Toronto", province:"ON", postal_code:"L4C02G"}}, {type:"address", data:{address_id: 1984, address: "3611 Main St. West", city:"Hamilton", province:"ON", postal_code:"R5O8H5"}}, {type:"address", data:{address_id: 1757, address: "1177 Ontario St. Unit 8", city:"Mississauga", province:"ON", postal_code:"L9H6B3"}}, {type:"address", data:{address_id: 4536, address: "3945 John St.", city: "Ajax", province: "ON", postal_code: "L7M4T9"}}, {type:"address", data:{address_id: 2473, address: "391 Baker St. Apt 231", city: "Mississauga", province: "ON", postal_code: "M4T8S3"}}, {type:"address", data:{address_id: 1611, address: "183 City Ct.", city: "Hamilton", province: "ON", postal_code: "J3T9V2"}}, {type:"address", data:{address_id: 1836, address: "67 Rhymer Ave.", city: "Stouffville", province: "ON", postal_code: "L3C8H4"}}, {type:"address", data:{address_id: 2727, address: "287 Brant St. Apt 4A", city: "Waterdown", province: "ON", postal_code: "R93G3P"}}, {type:"address", data:{address_id: 5464, address: "11 New St. Apt 2B", city: "Brampton", province: "ON", postal_code: "L694R7"}}, ]; var CustomerDB = { customers:[], addresses:[], stores:[], insertData(allData) { allData.forEach(obj => { if(obj.type === 'store') { this.stores.push(obj.data); } else if(obj.type === 'customer') { this.customers.push(obj.data); } else if (obj.type === 'address') { this.addresses.push(obj.data); } else { // Anything you want to do with an object that has a // different type } }); } }; CustomerDB.insertData(allData); console.log(CustomerDB.customers); console.log(CustomerDB.stores); console.log(CustomerDB.addresses);