Query czml/json data in smart way

Question

I am using Cesium and I have a czml file (very similar to JSON format) and I would like to identify one of its elements by specifying the tag of interest:

var czml = [{
    "id" : "document",
    "name" : "Basic CZML billboard and label",
    "version" : "1.0"
}, {
    "id" : "Point A",
    "name" : "Point A",
    "label" : {
        "fillColor" : {
            "rgba" : [255, 255, 255, 255]
        },
        "font" : "12pt Lucida Console",
        "text" : "Point A",
    },
    "position" : {
        "cartographicDegrees":[
            0, 0, 0
        ]
    }
}, {
    "id" : "Point B",
    "name" : "Point B",
    "label" : {
        "fillColor" : {
            "rgba" : [255, 255, 255, 255]
        },
        "font" : "12pt Lucida Console",
        "text" : "Point B",
    },
    "position" : {
        "cartographicDegrees":[
            10, 10, 0
        ]
    }
}];

My goal would be to access a specific element of the variable czml by been able to query the element. For example if I wanted to access the all the data of point B I would like to do it somehow with some function without using any loop possibly (My czml data could be very big!!!).

I was able to achieve my goal like this:

for (var i=0; i<3; i++) {
    if (czml[i].id === "Point B") {
        console.log(czml[i].id);
        console.log(czml[i].name);
        console.log(czml[i].label.text);
        console.log(czml[i].position.cartographicDegrees) ;      
    }
}

But as you can see this is very inefficient. What is a more elegant and efficient way to achieve my goal?

Answer 1

You can use the find method.

 var czml = [{ "id": "document", "name": "Basic CZML billboard and label", "version": "1.0" }, { "id": "Point A", "name": "Point A", "label": { "fillColor": { "rgba": [255, 255, 255, 255] }, "font": "12pt Lucida Console", "text": "Point A", }, "position": { "cartographicDegrees": [ 0, 0, 0 ] } }, { "id": "Point B", "name": "Point B", "label": { "fillColor": { "rgba": [255, 255, 255, 255] }, "font": "12pt Lucida Console", "text": "Point B", }, "position": { "cartographicDegrees": [ 10, 10, 0 ] } }]; var point = czml.find((e) => e.id === 'Point B'); console.log(point);