Global Objects

Special global variables

along with msg.sender there are other msg special global variables that are useful:

  • msg.data — The complete calldata which is a non-modifiable, non-persistent area where function arguments are stored and behave mostly like memory

  • msg.gas — Returns the available gas remaining for a current transaction (you can learn more about gas in Ethereum here)

  • msg.sig — The first four bytes of the calldata for a function that specifies the function to be called (i.e., function selector)

  • msg.value — The amount of wei sent with a message to a contract (wei is a denomination of ETH)

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