Calldata array slice

Why use this example

Use this pattern to explore how Solidity represents typed values and how state-changing expressions affect storage. The entry isolates calldata array slice so its input, result, and state changes stay easy to compare.

Solidity to run

contract PayloadDecoder {
  function decode(bytes calldata payload) external pure returns (uint256) {
    return abi.decode(payload[4:], (uint256));
  }
}

PayloadDecoder decoder = new PayloadDecoder()
bytes memory payload = abi.encodePacked(bytes4(keccak256("value(uint256)")), abi.encode(uint256(42)))
decoder.decode(payload)

Official Solidity reference

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

What to expect

The decoder removes the first four bytes and ABI-decodes the remaining payload to uint256 value 42.

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.