代碼
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interface Rectangle {
type: 'rectangle',
width: number,
height: number
}
interface Circle {
type: 'circle',
radius: number
}
interface Parallelogram {
type: 'parallelogram',
bottom: number,
height: number
}
function area(shape: Rectangle | Circle | Parallelogram) {
switch (shape.type) {
case 'rectangle':
return shape.width * shape.height
case 'circle':
return Math.PI * Math.pow(shape.radius, 2)
case 'parallelogram':
return shape.bottom * shape.height
}
}
let shape: Circle = {
type: 'circle',
radius: 10
}
console.log(area(shape))
運行結果