Functions · easy

13. view vs pure

State-read vs state-free.

Write `double(uint256 x)` returning `x*2` declared `pure`.

Required in your answer: external pure returnsreturn x * 2

Compiles with solc in your browser

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

contract Math {
    function double(uint256 x) external /* TODO */ returns (uint256) {
        // TODO
    }
}

Output appears here.

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