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Of the two, I like the second one -- a) call the method, b) did it work?
Hm. That's backward. How can you call the method if you don't have a valid reference?
Of those two, I prefer the first: a) do we have a valid reference? b) if so, dereference it.
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.