Hi everyone, is there a way to code a receive but when a contract receives any token, not just ether?

If you mean a deposit function, then yes.

i don't think so, receive is for the native blockchain token like eth

I want to capture the event when a smart contract receives a token and automatically do something. Should I search for deposit function then?

No, is the token owned by the contract?

No, but it will have an allowance

So the contract calls transferfrom, or is the token transfer called from somewhere else?

Yes, the contract calls transferFrom

Then you need to declare an event, and emit it in the function, that calls transferfrom based on the arguments in the function.

Mmm I think I wasn't clear: I want to replicate the behaviour of a receive fallback function that works with ether but for when my contract receives a specific token the contract is aware of already. Is there a way to implement this behaviour?

no

uint8 costs less than uint256?

The EVM works with 256bit/32byte words (debatable design decision). Every operation is based on these base units. If your data is smaller, further operations are needed to downscale from 256 bits to 8 bits, hence why you see increased costs.

it surely a debateable decision, I shouldn't be paying for uint256 on uint8

found this
https://blog.8bitzen.com/posts/06-03-2019-solidity-global-uint8-variables-cost-more-gas-than-global-uint256-variables/

WTF?!

Really weird

thanks for the info

It this means use uint<256 only for packed structs for save gas?

Very interesting article, thanks for share with us

Also guys, I want share this tool, you can debug transactions line by line, you can simulate transactions, this tool save my life xD https://dashboard.tenderly.co/explorer

solidity is so beautiful

https://www.gemini.com/cryptopedia/what-are-stablecoins-how-do-they-work

Thanks 🙏

yes and python is good for what is needed

not for EVM world

Java another suicide

most of the standrads are in soldity no?

noone said you can't study
but I think that is better to start and specialize with one first

from a python lover, i agree.

Discovered Vyper some time later, but solidity is really cool

anyone worked his maths to develop contracts ? like to find complex formula that would calculate returns for a certain balance and time etc and constantly adapt

@karola96
You've mentioned Vyper, so maybe you know about it's current status in the community.

using comma

Vyper contracts are being deployed every day, someone must be using it.

what would be a good formula for a staking contract that would collect transaction fees

IERC20(Token).balanceOf(user)