How to check function parameters in Go

Posted by deamon on Stack Overflow See other posts from Stack Overflow or by deamon
Published on 2012-09-24T15:35:36Z Indexed on 2012/09/24 15:37 UTC
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Guava Preconditions allows to check method parameters in Java easily.

public void doUsefulThings(Something s, int x, int position) {
    checkNotNull(s);
    checkArgument(x >= 0, "Argument was %s but expected nonnegative", x);
    checkElementIndex(position, someList.size());
    // ...
}

These check methods raise exceptions if the conditions are not met.

Go has no exceptions but indicates errors with return values. So I wonder how an idiomatic Go version of the above code would look like.

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