CODEWITHSUNDEEP
javascriptnode.jstypescript
Sandro Rey
Sandro Rey

Reputation: 2979

Error creating class with properties in the constructor

I have created this class:

export class ModelTransformer {
  constructor(private readonly hostelTransformer: HostelTransformer) {}

  static transform(hostel: Hostel): Hotel {
    return hostelTransformer.transform(hostel);
  }
}

But when I compile it I have this compilation error:

error TS2304: Cannot find name 'hostelTransformer'.

I also tried 

 static transform(hostel: Hostel): Hotel {
        return this.hostelTransformer.transform(hostel);
      }

but then I have the error:

error TS2339: Property 'hostelTransformer' does not exist on type 'typeof ModelTransformer'.

Upvotes: 0

Views: 54

Answers (1)

adiga
adiga

Reputation: 35202

You can't access the instance properties inside static methods.

When you use private readonly hostelTransformer: HostelTransformer in the constructor, it goes on the instance of the ModelTransformer class. Like this

constructor(hostelTransformer) {
  this.hostelTransformer = hostelTransformer;
}

You can't use return this.hostelTransformer.transform(hostel) because transform is a static method. When you call ModelTransformer.transform(), this will be ModelTransformer and not the instance of the class.

If you want to use that property, you need to make the method non-static

Upvotes: 1

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