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Except that describes a right shift, and specification says a left shift. You might consider left shift to be negative shift, in which case you are correct mathematically, but I'd feel much more comfortable keeping the whole calculation in positive territory.
Arrays: Left Rotation
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(i + shift) % lenght Should be enough
Except that describes a right shift, and specification says a left shift. You might consider left shift to be negative shift, in which case you are correct mathematically, but I'd feel much more comfortable keeping the whole calculation in positive territory.