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Why don't we use interpolation?
Why doesn't Jason use string interpolation instead of manually typing in all those + " " spaces?
Steven Parker216,057 Points
You didn't mention which course you were viewing, but I'd bet that if interpolation wasn't introduced earlier in the same course, it's not used for the benefit of students who might not have already taken one where it is explained.
And don't be surprised when you are able to improve on the course examples, that's an indication of your learning progress.