How to fix an error in the constructor of the Component class?

Question

React Native

Good afternoon!
Recently, I have come across a solution to the problem described by Expo CLI:

TypeError: Cannot set property 'result' of undefined

Judging by the description, React Native failed to set the Result property in the component, but error sources say so
How to correctly define the result property, solving this problem (since I work with class constructors for the first time)?
Examples of problematic code in the comments to the question...