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Security & Advanced
checks effects interactions reentrancy guard access control pull payment block.timestamp block.number keccak256 abi.encode abi.encodePacked selfdestruct caveat
Solidity / Data Locations

calldata

Learn calldata in Solidity through a focused explanation, a dedicated construct-specific example, an engineering boundary, and a mastery check.

10 min read • Beginner

calldata is an atomic Solidity topic inside Data Locations. This lesson focuses on how the calldata construct is written, what it changes, and when it is the right tool.

Trace the example line by line. Identify the exact syntax for calldata, the input state before it runs, and the resulting value, control flow, database state, hardware behavior, or runtime effect afterward. Neighboring lessons use different constructs rather than renamed copies of this one.

Topic-specific example

solidity-03-03-calldata.sol
solidity Try It Live 
contract C { function sum(uint[] calldata xs) external pure returns(uint s){ for(uint i;i<xs.length;i++) s+=xs[i]; } }
Edge case / engineering note

For calldata, test the boundary that belongs to this exact feature rather than a generic failure case. Check invalid or empty input, NULL/unknown state, numeric limits, transaction or exception behavior, synthesis/runtime constraints, ownership/permission rules, or backtracking/control-flow effects where they apply.

Content source & attribution
Original Syntaxis Content · Original Syntaxis Content

Lesson quizzes

calldata Mastery Check →
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