What's wrong here, why getting UndefVarError?

New to Julia
2

This works:

julia> for i = 1:1000
         if i % 3 == 0 || i % 5 == 0
           global var += i
         end
       end

This is the global scope issue, see Another possible solution to the global scope debacle.

Also note that for speed, you need to do your computations inside a function. Where that loop will work just fine (without the global).

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