Tristan Edwards

Hi Jerry! I recently updated the course with the latest versions of Solidity and had overlooked some of the old code snippets. I have now fixed it and believe that you should be able to follow lesson 8 as expected!

Done!

@andre-lindgren98: Stämmer, tack!

@yahya: That's right, the migrate command will automatically figure which contracts need to be compiled before the migration. "truffle compile" simply compiles your contracts into bytecode, but doesn't deploy them anywhere.

@yahya: * The gas used in a certain operation will always remain the same. The price that you pay for it varies however! So if you're okay with waiting a longer time for your operation to be performed, you can set a very low price (in ether) for the gas you consume. ** Yes, deploying a contract requires at least one transaction and can be quite expensive depending on how big your smart contract is. *** Generally yes. However, there are some functions that don't modify any state, and that are free to call. You'll see this in the next chapter. :)