Where's Waldo?

JavaScriptHardarraysfunctional_programming

Instructions

Return the coordinates ([row, col]) of the element that differs from the rest.

Examples

whereIsWaldo([
  ["A", "A", "A"],
  ["A", "A", "A"],
  ["A", "B", "A"]
]) ➞ [3, 2]

whereIsWaldo([
  ["c", "c", "c", "c"],
  ["c", "c", "c", "d"]
]) ➞ [2, 4]

whereIsWaldo([
  ["O", "O", "O", "O"],
  ["O", "O", "O", "O"],
  ["O", "O", "O", "O"],
  ["O", "O", "O", "O"],
  ["P", "O", "O", "O"],
  ["O", "O", "O", "O"]
]) ➞ [5, 1]

Notes

The given array will always be a square.
Rows and columns are 1-indexed (not zero-indexed).

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Walks through the solution with reasoning and edge cases.