Calling a view function

A view function does not use gas when called, but if we decide to call a view function inside of another function which is a transaction, it then uses gas.

Even if you make a function a view function, you still have to pay full gas costs if it's being called inside a transaction. Such view functions are only free if called locally, not inside a transaction.

//SPDX-License-Identifier:MIT

pragma solidity ^0.8.3;
contract GasSaver {
    uint256[] private numbers = [2,3,5,67,34];

    function getNumberAt( uint256 _index ) public view returns (uint256){
        return numbers[_index];
    }
    //Gas used when getNumber was called: 44778

    //Gas used without calling getNumber() 44450
    function sumAndMultiply() public {
       uint256[] memory _numbers = numbers;
       uint256 arrlength = _numbers.length;
       for(uint256 i=0; i < arrlength; ++i){
          numbers[i] = _numbers[i] * i;
       }
       //getNumberAt(2);
    }
}

• calling getNumberAt uses no gas