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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | 1x 3x 3x 1x 1x 1x 1x 3x 3x 1x 4x | export interface Shape {
area() : number
}
export class Square {
constructor(private side: number) { }
area() : number { return this.side * this.side }
}
export class Circle {
constructor (public radius: number) {}
area() : number { return Math.PI * this.radius * this.radius}
}
// represents ncopies of base shape, arranged in a row
export class ShapeArray {
constructor (public base: Shape, public ncopies: number) {}
area() : number {return this.ncopies * this.base.area()}
}
export function area (s:Shape) : number {
return s.area()
}
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