Flutter how to filter array

Question

Please give me the solution for this. I have json data here

{
"id": "61e7e10f5c5677",
"travel_map": [
    {
        "odometer": 0,
        "coords": {
            "altitude": 150.1,
            "heading": -1,
            "latitude": 28.5799048,
            "speed": -1,
            "longitude": 77.3191382
        }
    },
    {
        "odometer": 0,
        "coords": {
            "altitude": 149.8,
            "heading": 315.43,
            "latitude": 28.5799129,
            "speed": 0.01,
            "longitude": 77.3191291
        }
    }
]
}

I need to filter latitude and longitude from these data in array like this

[LatLng(28.5799048, 77.3191382), LatLng(28.5799129, 77.3191291)]

Without trying anything give me the solution? show some effort if you want to learn, do some research and visit how to ask a good question — greetal
– greetal, Commented Jan 20, 2022 at 5:04

Nomanur · Accepted Answer · 2022-01-20 05:34:49Z

1

Try this:

var travelMapList = yourJson["travel_map"] as List? ?? [];
var latLangList = travelMapList.map((e) => LatLng(e["coords"]["latitude"] ?? 0, e["coords"]["longitude"] ?? 0));
print(latLangList);

This will print

(Instance of 'LatLng', Instance of 'LatLng')

answered Jan 20, 2022 at 5:34

Nomanur

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1 Comment

Abhishek Pandey Over a year ago

It works. Thank you

Saddan · Accepted Answer · 2022-01-20 05:05:35Z

0

Use Json to dart converter

if you get the response from api do like this

final parsedData=json.decode(response.body);
MyJsonToDartData data= new MyJsonToDartData.fromJson(parsedData);

now you can use the data as a object and access all the underlying values

answered Jan 20, 2022 at 5:05

Saddan

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