The function is given a map with 1 representing land, o representing water. A land cell can have four neighbors along its edges. Compute the total perimeter of shore-lines that are defined by land cells touching water or the outer edges of the map. Each cell edge has a length equal to 1. An isolated cell without neighbors has a total perimeter length of 4. Examples islandsPerimeter ([ [0, 1, 0, 0], [1, 1, 1, 0], [0, 1, 0, 0], [1, 1, 0, 0] ]) → 16

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