Does extracting variables slow down the loop?
No. Calculating the variable once outside the inner loop is actually a micro-optimization, saving the CPU from recalculating the math on every inner iteration.
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Because patterns naturally require dense math and nested loops. If you don't write it cleanly, the code becomes impossible to debug or explain to an interviewer.
Variables like 'i' and 'j' carry no semantic meaning. Using 'row' and 'space' explicitly documents the loop's geometric purpose.
It means taking a confusing mathematical formula (like 2*row - 1), calculating it, and storing it in a descriptive variable (like maxStars) before the loop starts.
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