Functions, Visibility, Modifiers, and State Changes

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The concept Every Solidity function declares a visibility: public (callable externally and internally, and auto-generates calldata ABI), external (callable only from outside the contract — cheaper for large array/struct arguments because they stay in calldata instead of being copied), internal (callable only from this contract or derived contracts, no external ABI entry), and private (callable only from this exact contract,……

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