How can I access an object of type A that’s within an object of type B using pipes and mapping?

How can I access an object of type A that’s within an object of type B using pipes and mapping?

If you’re using TypeScript and need to access an object of type A that’s within an object of type B, you can achieve this by using pipes and mapping. In this blog post, we will explore two solutions to this problem.

Solution 1: Using the safe navigation operator (?.)

The safe navigation operator (?.) allows you to access properties of an object without getting an error if the property is null or undefined. You can use this operator in combination with the map operator to access the object of type A within the object of type B.

const objectB: TypeB = {
  propertyA: {
    propertyB: {
      propertyC: 'Value'
    }
  }
};

const value = objectB?.propertyA?.propertyB?.propertyC;

In the above code snippet, we define an object of type B (objectB) with a nested object of type A (propertyA). We then use the safe navigation operator to access the propertyC within propertyB. If any of the properties are null or undefined, the value variable will be assigned undefined.

Solution 2: Using optional chaining

Optional chaining is another way to access properties of an object that may be null or undefined. It is similar to the safe navigation operator but with a slightly different syntax.

const objectB: TypeB = {
  propertyA: {
    propertyB: {
      propertyC: 'Value'
    }
  }
};

const value = objectB?.propertyA?.propertyB?.propertyC;

In the above code snippet, we define an object of type B (objectB) with a nested object of type A (propertyA). We then use optional chaining to access the propertyC within propertyB. If any of the properties are null or undefined, the value variable will be assigned undefined.

Conclusion

Both the safe navigation operator and optional chaining provide a convenient way to access nested objects in TypeScript. Depending on your preference and project requirements, you can choose either of these solutions to access an object of type A within an object of type B.

Remember to always handle null or undefined values appropriately to avoid runtime errors.