How to sort an array of objects which hold again an array of objects

Question

How to sort an array of objects which hold again an array of objects and I want to sort it by their last timestamp.

 var weather = [{
    city: 'New York',
    status: 1,
    response: [{
        name: 'Example', lastTimestamp: '2017-12-19T12:43:14.000Z',
        name: 'Example2', lastTimestamp: '2017-12-19T12:42:14.000Z'
    }]
  },
  {
    city: 'Chicago',
    status: 1,
    response: [{
        name: 'Example', lastTimestamp: '2018-05-10T09:00:00.000Z',
        name: 'Example2', lastTimestamp: '2018-05-10T09:04:00.000Z'
    }]
  }
]

In return I want the sorted object like this

 var weather = [
  {
    city: 'Chicago',
    status: 1,
    response: [{
        name: 'Example', lastTimestamp: '2018-05-10T09:00:00.000Z',
        name: 'Example2', lastTimestamp: '2018-05-10T09:04:00.000Z'
    }]
  },
  {
    city: 'New York',
    status: 1,
    response: [{
        name: 'Example', lastTimestamp: '2017-12-19T12:43:14.000Z',
        name: 'Example2', lastTimestamp: '2017-12-19T12:42:14.000Z'
    }]
  }
]

Use array.sort with a custom function that checks lastTimestamp — bamtheboozle
– bamtheboozle, Commented Jul 2, 2018 at 11:14
Possible duplicate of Sort array of objects by string property value in JavaScript — eisbehr
– eisbehr, Commented Jul 2, 2018 at 11:14
it largely depends on how the sort criteria is based if there is more than one record in response. Besides, the response elements format is invalid, you probably forgot to add the object notation. That said, you should just use the sort prototype with the custom callback. — briosheje
– briosheje, Commented Jul 2, 2018 at 11:15
[name: … is a syntax error, since JS arrays cannot have named keys, but only numerical keys. — feeela
– feeela, Commented Jul 2, 2018 at 11:16

Vignesh Raja · Accepted Answer · 2018-07-02 11:19:11Z

1

This might work. It sorts by the city name and if they are equal they are sorted by the lastTimestamp.

var weather = [
    {
        city: 'New York', status: 1, response: {name: 'Example', lastTimestamp: '2017-12-19T12:43:14.000Z'}
    },
    {
        city: 'Chicago', status: 1, response: {name: 'Example', lastTimestamp: '2018-05-10T09:00:00.000Z'}
    },
    {
        city: 'New York', status: 1, response: {name: 'Example', lastTimestamp: '2017-12-20T12:43:14.000Z'}
    },
    {
        city: 'Chicago', status: 1, response: {name: 'Example', lastTimestamp: '2018-05-09T09:00:00.000Z'}
    }
];

weather.sort(function(a,b){
    return a.city>b.city ? 1 :
            a.city<b.city ? -1 : new Date(a.response.lastTimestamp)-new Date(b.response.lastTimestamp)
})

console.log(weather);

answered Jul 2, 2018 at 11:19

Vignesh Raja

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Comments

Adrian Sawicki · Accepted Answer · 2018-07-02 11:26:21Z

0

Use sort with your own function. It should look like this:

weather.sort( (a,b) => {
    return new Date(b.response.lastTimestamp) - new Date(a.response.lastTimestamp)
});

edited Jul 2, 2018 at 11:26

answered Jul 2, 2018 at 11:24

Adrian Sawicki

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1 Comment

Vignesh Raja Over a year ago

No need of getTime()

Alex S. · Accepted Answer · 2018-07-02 11:31:40Z

0

Use sort method of Array:

weather.sort(function(obj1, obj2){
   return obj1.response.lastTimestamp < obj2.response.lastTimestamp ? 1 : -1;
});

edited Jul 2, 2018 at 11:31

answered Jul 2, 2018 at 11:18

Alex S.

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