I had the same query, and I understand now. I will further add to Alexander's well-explained answer. As he mentioned, 9/10 times we can use this refactoring strategy. I will add where not to apply this1. If you have a database query operation involved 2. if you are reading from a file3. if anything involves with complexity greater than or equal to O(n^2)Also, I think it is possible to calculate it once and store it as a class variable instead of a local variable.
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