How should I practice Compute Areas Through an Abstract Shape Type?

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Compute Areas Through an Abstract Shape Type

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Problem statement

Implement an abstract shape contract with an area() operation. Each kind is SQUARE, RECTANGLE, or TRIANGLE. The parallel arrays first and second provide side/width/base and ignored/height/height respectively.

Return twice each shape's geometric area, avoiding fractions: square 2*a*a, rectangle 2*w*h, triangle b*h.

Function

twiceAreas(kinds: String[], first: int[], second: int[]) → long[]

Examples

Example 1

kinds = ["SQUARE","RECTANGLE","TRIANGLE"]first = [3,4,5]second = [0,6,7]return = [18,48,35]

Every concrete shape supplies the same abstract operation.

Example 2

kinds = []first = []second = []return = []

No shapes produce no areas.

Constraints

All three arrays have equal length at most 100000.
Dimensions are integers in [0, 1000000000].
second[i] is ignored for squares.

Source note: Author-written prompt excerpt retained for source fidelity.