如何忽略GO中返回的错误

Question

I have started learning Go today.
One thing that makes me crazy, it's the err returned parameter.

Let's assume I need to nest few functions. like this:

return string(json.Marshal(MyData))

or more complex example:

return func1(func2(func3(MyData)))

Is it really necessary to write:

tmp1 , _ = func3(MyData)
tmp2 , _ = func2(tmp1)
tmp3 , _ = func1(tmp2)
return tmp3

That's annoying!
Is there any way to make the code looks cleaner?

Answer 1

The real answer is: Don't.

Never just ignore the errors.

Seriously. The errors are there for a reason. If a function returns an error, it almost always means that it's possible, during the operation of your program, even if it's 100% bug-free, for the function to fail. And if it does, you don't usually want to just keep going as if nothing happened.

If you're absolutely sure that you're using a function in a way that ensures that it will never return a non-nil error (unless there's a bug in your program, and there always is), you might want to write a Must-style function like in the template package which panics with the returned error value.

Error handling is not noise. It's not clutter. It's not something you want to get rid of. If it looks like 50% of your program is error handling, that's because 50% of your program is, and should be, error handling.