ABI signature encoding

Why use this example

Use this pattern when you need to check the exact bytes, selector, hash, or decoded values that Solidity will produce. The entry isolates abi signature encoding so its input, result, and state changes stay easy to compare.

Solidity to run

bytes4 selector = bytes4(keccak256("approve(address,uint256)"))
bytes memory bySignature = abi.encodeWithSignature("approve(address,uint256)", address(0xBEEF), 42)
bytes memory bySelector = abi.encodeWithSelector(selector, address(0xBEEF), 42)

bySignature
bySelector
keccak256(bySignature) == keccak256(bySelector)

Official Solidity reference

Compare this focused investigation with the complete language definition in the Solidity documentation.

What to expect

Both encoding paths produce identical approve calldata, and the final hash comparison returns true.

Continue the investigation

Change a value, add another expression, or open Inspect after the run. Accepted entries remain available to the next entry, and the clean replay keeps the complete result reproducible.