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Let's say there is a uint[] public MyArray declared in contract_A.

Is there a possiblility to create an interface contract_A that would allow to read the values in MyArray from another contract, or is it absolutely necessary to build a getter for MyArray in contract_A?

Asking this because of the code size limit, if there are a lot of arrays in contract_A, would be convenient to not build a getter for all of them (they need to be read by another contract).

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All public variables automatically generate a getter function so you don't need to explicitly create new ones.

Here is an example:

pragma solidity >=0.5.0;

contract A {
     uint[1] public MyArray;
     constructor() public {
         MyArray[0] = 56;
     }
  
}
contract B {
    function DoIt() public returns (uint) {
        A contr = new A();
        return contr.MyArray(0);
    }
}

You should deploy contract B and call its DoIt function to get result 56.

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  • Thank you. When doing new A(), does it create a new instance of contract A? Is there a way to point to an already existing contract A? – Thomas Dec 20 '20 at 16:34
  • Yes, it creates a new instance. You can point to an existing A with A contr = A(addressOfA); – Lauri Peltonen Dec 20 '20 at 17:00
  • perfect, thank you. – Thomas Dec 20 '20 at 17:23

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