Important Starknet Methods

The table below contains important methods used while building starknet smart contracts. It contains the name of the method, a keyword to import such a method, and finally a simple single line usage of each method. Also note that multiple method imports can be chained to make the codebase simpler and also avoid repetition, e.g., `use starknet::{get_contract_address, ContractAddress}.

Table 1.0

get_contract_address() use starknet::get_contract_address let ThisContract = get_contract_address(); Returns the contract address of the contract containing this method.
get_caller_address() use starknet::get_caller_address let user = get_caller_address(); Returns the contract address of the user calling a certain function.
ContractAddress use starknet::ContractAddress let user: ContractAddress = get_caller_address(); Allows for the usage of the contract address data type in a contract.
zero() use starknet::ContractAddress let addressZero: ContractAddress = zero(); Returns address zero contract address
get_block_info() use starknet::get_block_info let blockInfo = get_block_info(); It returns a struct containing the block number, block timestamp, and the sequencer address.
get_tx_info() use starknet::get_tx_info let txInfo = get_tx_info(); Returns a struct containing transaction version, max fee, transaction hash, signature, chain ID, nonce, and transaction origin address.
get_block_timestamp() use starknet::get_block_timestamp let timeStamp = get_block_timestamp(); Returns the block timestamp of the block containing the transaction.
get_block_number() use starknet::get_block_number Let blockNumber = get_block_number(); Returns the block number of the block containing the transaction.
ClassHash use starknet::ClassHash let childHash: ClassHash = contractClassHash; Allows for the use of the class Hash datatype to define variables that hold a class hash.