Press n or j to go to the next uncovered block, b, p or k for the previous block.
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 | 1x 3x 1x 1x 1x 3x 1x 7x 3x 4x 1x 3x 3x | type Shape = Square | Circle | ShapeArray export class Square { constructor (public side: number) {} } export class Circle { constructor (public radius: number) {} } // represents ncopies of base shape, arranged in a row export class ShapeArray { constructor (public base: Shape, public ncopies: number) {} } export function area (s:Shape) : number { if (s instanceof Square) { return s.side * s.side } else if (s instanceof Circle) { return Math.PI * s.radius * s.radius } else if (s instanceof ShapeArray) { return s.ncopies * area(s.base) } } |