Teal Note

TEAL Basic knowledge

• @2022-01-14

• TEAL example walk through: The smart contract language

• TEAL example: Smart contract details

  • stateful smart contracts on Algo chain
  • generate asset + Escrow accounts
  • store values on the blockchain, globally(on blockchain) or locally(in accounts balance record)
  • NoOp, OptIn, DeleteApplication, UpdateApplication, CloseOut, ClearState
  • PyTeal can write smart signatures and smart contracts

• @2022-01-20

• TEAL runs on AVM.

• As a new stack language programmer, this tutorial gives an idea of how stack language works. This is turing complete. But with a of repetition/redundancy if we don't use the "memory addressing" thing. GodBa recommended this :Forth language

  programs are processed one line at a time pushing and popping values on and off the stack. These stack values are either unsigned 64 bit integers or byte strings.

  This is a stack language, according to GodBa

  Dynamic operational cost

  Maybe we can abuse this and use a lot of public accounts to increase the operational cost for smart contract.

• @2022-01-28

• Return Int(1) means success, Int(0) means failure. Also works for the "Smart Contract Methods"

• We can consider Seq, Return like they are returning a function.

Learning resources

• TEAL full docs(not so detailed): Transaction Execution Approval Language
• TEAL operators: Opcodes Transaction Execution Approval Language (TEAL)
• TEAL Guidelines
• TEAL debugger: Smart contract debugging
• Installing goal can be useful here(failed testing)

Problems

• @2022-01-30
• Can we create many false users to expand the key-value pair stuck? Should we?
• A contract can store up to 64 key-value pairs in global state and up to 16 key-value pairs per user who opts into the contract. Once these values are set, they can never be changed. Said here