[Ethereum] Access Tuples elements


I have the following tuple:

( , , uint256 standardDepositAmount, , )

I need to use the standardDepositAmount in a require, like:

require(standardDepositAmount == something)

how can i do that?

Best Answer

You can find more information in the Solidity official documentation, but it's important to note that:

Tuples are not proper types in Solidity, they can only be used to form syntactic groupings of expressions.

For this reason, in your case you should be able to read the standardDepositAmount variable without doing anything more, because it is already defined as uint256 and it is (probably) already assigned.

Here a working example where the require function is satisfied:

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.5.0 <0.8.0;

contract myContract {
    uint index;

    function myFunction() public {
        ( , , uint256 standardDepositAmount, , ) = returnTuple();
        require(standardDepositAmount == 3);
        // do something...
    function returnTuple() public pure returns (uint, uint, uint, uint, uint) {
        return (1, 2, 3, 4, 5);

I created a gist for you. You can also do other experiments using Remix and the above smart contract following this link.

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