Low level interactions on Remix IDE – Remix IDE

Low level interactions can be made by passing calldata (which is accessed as msg.datainside smart contract) & value (which is accessed as msg.valueinside smart contract). Although these fields are not mandatory.

For value, it uses the already available value field (which is also used in normal method calls).

For calldata, a new text field is introduced corresponding to each contract.

To execute low level interaction, one can fill up these fields and click on the Transact button to send a transaction.

One can see in Remix console which method is called according to filled inputs.

Note: For now, low level interactions are available for the contracts which defined receive or/and fallback functions.

Use cases

1. Only fallback() is defined

Sending some ether value to it with show the error: “In order to receive Ether transfer the contract should have either ‘receive’ or payable ‘fallback’ function”

Sending some calldata will execute the functionality of fallbackfunction.

one can send value along with calldata.

2. Only receive() is defined

it will throw error on compilation itself : TypeError: Receive ether function must be payable, but is “nonpayable”

only value can be sent to contract. Sending calldata will show the error: ‘Fallback’ function is not defined

3. receive() & fallback() both are defined

• receive labelled as payable and fallbackis nonpayable,

sending value or calldata only will be fine. If value and calldata are sent together, it will throw run-time error as fallback will be called with calldata but it is not payable so cannot accept value.

For only calldata fallbackis called, for only value, receive is called. For calldata and value both, fallback is called.

Thus, one can use low level interactions on Remix IDE.

Epilogue

Remix Team always works hard to provide users more features with high flexibility & less complexity.

If you still have any queries/feedback regarding low level interactions on Remix, you can open issue on our github or discuss it in our gitter channel.