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Go Code Output Reasoning

HardCoding00:00
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Your question is Go Code Output Reasoning. Take a moment with it on the right.

Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).

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Problem

There were two technical questions where I was given a gist with some go code and was asked to describe what the code would output. The code was a bit tricky and designed to test knowledge of the underlying data structures of some of go's builtin types.