retrieve the initial subarray from the array using rxjs

Looking to extract the first array from a subarray, my current setup is as follows:

  Map: map;

 Map() {
    Service
      
        });
  }

This is the interface structure:



export interface map { 
   
}

Encountering an error message:

ERROR TypeError: Cannot set property 'heatmap' of undefined

What changes should be made to resolve this issue?

Another error persists:

core.js:4442 ERROR TypeError: Cannot read property 'map' of null
    
.pipe(map((res) => res.map.slice(0, 1)))

The function looks like this:

 Map() {
    
        });
  }

After some adjustments, it now appears as follows:

 dMap() {

    console.log(this.Map.map);

    this.Service
      
        });
  }

However, hovering over this line triggers an issue:

console.log(this.Map.heatmap);

Answer №1

modification

 revisedCameraAggregateHeadMap: RevisedCameraAggregationHeatmap;

convert to

 revisedCameraAggregateHeadMap: RevisedCameraAggregationHeatmap = {};

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