hauge hauge - 1 month ago 8
Javascript Question

filter object by key and its items

I have an object that I would like to filter it's keys..

Im trying to filter the object by an ID, like so:

let myKeys = Object.keys(data).filter(function(key) {
//console.log(data[key]);
if(parseInt(key) === parseInt(vm.system_id)) {
return data[key];
}
});

console.log(myKeys);


This works, partialy - im getting the key, however, im not getting all the data/items under this item im filtering out

The object im filtering is one similar to this one:

{
"646": [{
"id": 52144,
"timestamp": "2017-08-17T14:10:23Z",
"type": "alarm",
"code": 210,
"title": "",
"description": "",
"remedy": "",
"appeared": "2017-08-17T14:10:09Z",
"disappeared": null,
"acknowlegded": null,
"solved": null,
"system_name": "CG-MX19D7K5C1",
"system_id": 646,
"system_device_id": 458,
"stream": "cu351.alarm_code"
}
],
"693": [{
"id": 51675,
"timestamp": "2017-08-16T13:59:55Z",
"type": "alarm",
"code": 215,
"title": "",
"description": "",
"remedy": "",
"appeared": "2017-08-16T13:59:57Z",
"disappeared": null,
"acknowlegded": null,
"solved": null,
"system_name": "Demo 07122016",
"system_id": 693,
"system_device_id": 371,
"stream": "cu351.alarm_code"
}, {
"id": 51677,
"timestamp": "2017-08-16T13:59:57Z",
"type": "alarm",
"code": 214,
"title": "",
"description": "",
"remedy": "",
"appeared": "2017-08-16T13:59:59Z",
"disappeared": null,
"acknowlegded": null,
"solved": null,
"system_name": "Demo 07122016",
"system_id": 693,
"system_device_id": 371,
"stream": "cu351.alarm_code"
}
]


}

Answer Source

Array#filter is expecting a boolean value as return value, you might use this

let myKeys = Object.keys(data).filter(key => key == vm.system_id);

for getting the keys and then render a new object with the given keys.

To get all items in a single array, you could collect them with

let result = myKeys.reduce((r, k) => r.concat(data[k]), []);