zineddinebk09 / solidity

Thinks i learned and documented from the FCC 32 hrs Web3 and solidity course

Web3 and Solidity - FreeCodeCamp Course

General knowledge

• Nonce: transaction count for the account
• Gas Price: ptice per unit of gas (wei)
• Gas Limit: max gas that can be used for the transaction
• To: address of the account to send the transaction to
• Value: amount of ether to send (wei)
• Data: what to send to the To address
• V, R, S: signature of the transaction

Solidity

• pragma: version of the compiler
• contract: like a class in OOP
• constructor: a function that runs once when the contract is created
• public: can be accessed from outside the contract
• view: can be called without spending gas
• pure: does not read from or modify the state and does not spend gas
• memory: temporary place to store data
• storage: permanent place to store data
• mapping: like a hash table
• require: like an if statement
• msg.sender: address of the account that called the function
• msg.value: amount of ether that was sent along with the function call
• address(this): address of the contract
• address payable: address that can send ether
• modifier: like a function that is run before the function it is applied to
• receive function: a special function in solidity that is run when the contract receives ether without a function call
• fallback function: a special function in solidity that is run when the contract receives ether and the function call does not match any other function

Optimization (Gas Efficiency)

• immutable: variables that cannot be changed after the contract is deployed
• constant: variables that cannot be changed after the contract is deployed and can be accessed from outside the contract
• if and custom errors instead of require: require uses more gas than if statements and custom errors
• view: functions that do not change the state of the contract
• pure: functions that do not read from or modify the state of the contract