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An approximation to abi.encodeWithSignature is abi.encodePacked(bytes4(keccak256(signature)), abi.encode(parameters...)) You can save 0x3df02124 as byte4 variable in your contract and use an adaptation of the code above: bytes4 functionSig = 0x3df02124 abi.encodePacked(functionSig, abi.encode(parameters...))


Uniswap protocol is developed in Solidity, and you can find two main building blocks: uniswap-v2-core: Core smart contracts, essentially with the Factory, Pair and ERC20, together with a number of interfaces and libraries. uniswap-v2-periphery: additional smart contracts to interact with the Core ones. They simplify the process of doing swaps or adding/...

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