Does a view function use gas if called by another function which access the same storage variable?

Question

Let's say I have a view function that accesses a storage mapping like so:

function performCalculation(uint256 _id) public view returns(uint256) {
      uint256 memory someValue = someMapping[_id];
      return someValue - 10;
}

And I have another function which also accesses that same value:

function someFunction(uint256 _id) external {
      uint256 storage someValue = someMapping[_id];
      // do something
}

If inside someFunction I needed to perform the same calculation that performCalculation does, would calling performCalculation from someFunction use more gas as it is accessing storage again? Would the better solution be to just do the same calculation inline using the someValue from someFunction?

Answer 1

From someFunction in a transaction, it would cost either more or the same gas.

The fact that it's a view function only allows calling this using a node RPC instead of submitting a transaction, but it doesn't reduce the cost of a mined transaction.