How to pass a blank bytes calldata into a solidity function call?

Question

I have a function that looks like this:

function foo(uint _someVar, bytes calldata _data) public {
    ...
}

Then I make a call to it from another function with "" as _data:

foo(123, "");

"" seems to be the default way to pass blank bytes. However, I get this truffle compilation error:

TypeError: Invalid type for argument in function call. Invalid implicit conversion from literal_string "" to bytes calldata requested.

I have tried to declare and pass variables, but it all comes down to trying to assign blank calldata bytes. Any tips on how to do this?

Answer 1

Try to use "0x". It helps me.

Answer 2

bytes memory data = new bytes(0);