Update struct from function only if parameters exists

Question

What's the appropriate way to update a struct via a function only if the parameters exist? For example

struct MyStruct {
  bytes32 someThing
  bytes32 someOtherThing
}

function updateStruct(bytes32 someThing, bytes32 someOtherThing) public {
  // get struct
  if (someThing) {
    struct.someThing = someThing;
  }
  if(someOtherThing) {
    struct.someOtherThing;
  }
}

I only want to update the fields of the struct if the argument is passed into the function. If it's null or undefined I don't want to update the struct with that value.

Answer 1

So since your function has 2 parameters, you always have to pass 2 arguments. Now it depends on the type of function argument.

bytes32, you can use:

if(something.length != "")

If you have string, you can convert it to bytes32,

bytes memory testSomething= bytes(something);
if(testSomething.lenght > O)

If you have uint,

if(something > 0) 

In case of address:

if(something != 0x)