How Yul Lets Developers Control EVM Memory and Optimize Smart Contracts

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A developer walkthrough published on DEV Community explains how Yul, a low-level intermediate language, gives smart contract engineers direct control over EVM opcodes and memory management. Yul represents all data types as 256-bit unsigned integers and requires manual handling of storage, memory, and ABI encoding. It can be embedded inside Solidity using assembly blocks, offering performance gains when used correctly, though it adds significant mental overhead compared to higher-level languages. The author notes that Solidity and Vyper already abstract most of these concerns, and recommends libraries like Solady for most production use cases. Key concepts covered include storage slot manipulation using sload and sstore opcodes, and how mappings are implemented as hashed key-value pointers at the bytecode level.

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