Lesson 9 : Deriving vs importing

[GaneshDonikena]

Hi everyone, My doubt is

when to import a contract and when to derive a contract

[krakxn]

Let's say we have three contracts: Grandfather, Father, and Child contract

Here, the Father contract will inherit every characteristic of the Grandfather contract.
Likewise, the Child contract will inherit every characteristic of the Father contract - BUT, as Father inherits from Grandfather, our Child contract also inherits Grandfather's characteristics.

So, Father has Grandfather; Child has Father and Grandfather.

Now, if you were to import Father, you will only get the properties inside the Father contract and not the inherited properties.

Hope this answers your query!

[GaneshDonikena]

Thanks a lot @krakxn

[krakxn]

All the best!!

[alymurtazamemon]

@GaneshDonikena

import will simply access all public state variables and functions of the contract.

Deriving you mean inheretance. By inheriting a contract another contract can use all of its public as well as internal state variables and functions, not even functions that are marked as virtual will be forced by the child contract to implement.

You should more search about inheretance it is an object-oriented programming concept and it is a fundamental thing that you must know.

[GaneshDonikena]

Thanks ali @ali-thegilfoyle