Exercise 2: Confirming the Breadcrumb Order — Possible Solution
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SETUP
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Three real rows in the pages table:
  id: 1, title: 'Programming',            parentId: null
  id: 2, title: 'General-Purpose Languages', parentId: 1
  id: 3, title: 'Java',                    parentId: 2

CALLING getBreadcrumb(3)
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The while loop starts at currentId = 3, unshifts the Java row, then
moves to its parentId (2), unshifts the General-Purpose Languages
row at the front, then moves to its parentId (1), unshifts the
Programming row at the front, then stops since Programming's own
parentId is null.

RESULT
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[Programming, General-Purpose Languages, Java] - the root ancestor
first, the page itself last, exactly the order a real breadcrumb nav
needs to render left to right.

WHY THIS WORKS AS AN ANSWER
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It correctly traces the while loop's own repeated unshift calls
across three real levels, and correctly shows the resulting array
lands in root-to-leaf order rather than leaf-to-root.