I have the below test contract. is it possible through the truffle console to call the function "testStruct" that takes as an argument a struct?

contract TestContract{

    struct TestStructArgs { 
        string title;
        string details;
    function testStruct(TestStructArgs memory _params) external{      
    function testStruct2(string  memory _params) external{      

Its being defined as

'testStruct((string,string))': [Function: bound _createTxObject]


Im using Visual Studio Code with the "Truffle for VS Code extension" version 2.7.1 Im also using Ganache to deploy the contract into a local blockchain

Commands i execute on the VS console:

    truffle console --network ganache
    migrate --reset
    let contract = TestContract.deployed();
    const object = {title: "Hello", details: "Hey"};
    await contract.testStruct(object);

after this i get

    Uncaught TypeError: contract.testStruct is not a function
at evalmachine.<anonymous>:1:26

but all is ok if i execute

await contract.testStruct2("test");

1 Answer 1


You can pass an object with the same structure as the struct in solidity.


const object = {title: "Hello", details: "Hey"};
await contract.testStruct(object);

Then in the solidity function, you can have the same parameters as the struct.

mapping(address => TestStructArgs) mapp;
function testStruct(TestStructArgs memory _params) external{
    mapp[msg.sender].title = _params.title;
    mapp[msg.sender].details = _params.details;        

It's as simple as that. All this is possible easily since solidity resembles javascript to quite an extent. I hope this answers your query.

  • I did try this but i'm getting "instance.testStruct is not a function"
    – iamIcarus
    Commented Jan 23, 2023 at 18:47
  • Please provide more details.
    – vampireAb
    Commented Jan 24, 2023 at 4:55
  • thanks , i just updated my post with more details
    – iamIcarus
    Commented Jan 24, 2023 at 18:01
  • You got to await till the contract gets deployed. let contract = await TestContract.deployed(); This should do it.
    – vampireAb
    Commented Jan 25, 2023 at 4:19
  • thank you , that did it!
    – iamIcarus
    Commented Jan 25, 2023 at 18:31

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