take first array of subarray with rxjs

Question

I try to take first array of a sub array. So I have it like this:

  Map: map;

 Map() {
    Service
      
        });
  }

and this is the interface:



export interface map { 
   
}

But I get this error:

ERROR TypeError: Cannot set property 'heatmap' of undefined

so what I have to change?

I still get this error:

core.js:4442 ERROR TypeError: Cannot read property 'map' of null

.pipe(map((res) => res.map.slice(0, 1)))

and this is how I have it:

 Map() {
    
        });
  }

yes,

so I have this now:

 dMap() {

    console.log(this.Map.map);

    this.Service
      
        });
  }

But when I hover the mouse over this line:

console.log(this.Map.heatmap);

Your cameraAgretateHeadMap property is undefined. Just initialize it before your subscription. — pascalpuetz
– pascalpuetz, Commented Dec 9, 2020 at 17:39

Aakash Garg · Accepted Answer · 2020-12-09 17:51:31Z

4

change

 cameraAgretateHeadMap: CameraAggregationHeatmap;

to

 cameraAgretateHeadMap: CameraAggregationHeatmap = {};

answered Dec 9, 2020 at 17:51

Aakash Garg

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3 Comments

Aakash Garg Over a year ago

can you please elaborate?

CodeIsNice Over a year ago

Oke, I see now that heatmap has 100 elements. But I still dont see anything in the view. So yes, the data is loaded. But I dont anything on the web page.

Aakash Garg Over a year ago

@CodeIsNice, that's a separate issue, you can raise separate stackoverflow question for that.

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