CODEWITHSUNDEEP
javascriptnode.jsmongodbmongoose
Abid Rakhmansyah
Abid Rakhmansyah

Reputation: 966

undefined when loop objects Javascript

I want to ask something which is actually I don't know what's wrong with my code. So, i've docs from database. Here is my docs :

{  
  "docs":[  
    {  
      "orderDate":{  
        "value":"2018-03-20",
        "type":"date"
      },
      "name":{  
        "value":"Abid Rakhmansyah",
        "type":"text"
      },
      "phone":{  
        "value":"082117414233",
        "type":"number"
      },
      "email":{  
        "value":"[email protected]",
        "type":"email"
      },
      "paid":{  
        "value":true,
        "type":"boolean"
      }
    },
    {  
      "orderDate":{  
        "type":"date",
        "value":"2018-03-13T05:14:00.806Z"
      },
      "name":{  
        "value":"Iqbal Maulana",
        "type":"text"
      },
      "phone":{  
        "value":"082117414233",
        "type":"number"
      },
      "email":{  
        "value":"[email protected]",
        "type":"email"
      },
      "paid":{  
        "type":"boolean",
        "value":false
      }
    },
    {  
      "orderDate":{  
        "value":"2018-03-20",
        "type":"date"
      },
      "name":{  
        "value":"Abdullah",
        "type":"text"
      },
      "phone":{  
        "value":"092034",
        "type":"number"
      },
      "email":{  
        "value":"[email protected]",
        "type":"email"
      },
      "paid":{  
        "value":true,
        "type":"boolean"
      }
    },
    {  
      "orderDate":{  
        "value":"2018-03-20",
        "type":"date"
      },
      "name":{  
        "value":"asd",
        "type":"text"
      },
      "phone":{  
        "value":"234234",
        "type":"number"
      },
      "email":{  
        "value":"[email protected]",
        "type":"email"
      },
      "paid":{  
        "value":true,
        "type":"boolean"
      }
    },
    {  
      "orderDate":{  
        "type":"date",
        "value":"2018-03-20T06:01:54.821Z"
      },
      "name":{  
        "value":"as",
        "type":"text"
      },
      "phone":{  
        "value":"082117414233",
        "type":"number"
      },
      "email":{  
        "value":"[email protected]",
        "type":"email"
      },
      "paid":{  
        "type":"boolean",
        "value":false
      }
    }
  ],
  "total":5,
  "limit":8,
  "page":1,
  "pages":1
}

I want to get only value property in the objects. So, i try to code like this.

orders.docs.forEach( function (arrayItem)
  {
    Object.keys(arrayItem.toJSON()).forEach(function(key) {
        console.log(key, JSON.stringify(arrayItem[key].value));
    });
  });

I think that it will be work. But, I don't know why... The result of my code doesn't show like what I expected. Here is the result of my code :

[0] orderDate "2018-03-20"
[0] (node:20944) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): TypeError: Cannot read property 'value' of undefined

For the first loop it work fine, but when it going to 2nd loop. The value is undefined. What's is wrong?

Upvotes: 0

Views: 87

Answers (1)

Xhynk
Xhynk

Reputation: 13860

Are you sure you're not just overthinking it?

Here's a Demo

I'm sure it could be cleaned up further, but without modifying your code too much this can find the key and value pairs just fine:

orders = JSON.parse( orders );

orders.docs.forEach( function( arrayItem ){
    Object.keys(arrayItem).forEach( function(key) {
        console.log( key +': '+ arrayItem[key].value );
    });
});

Upvotes: 1

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