TS/JS 迭代器範例

SampleService.ts

class SampleService {
    prizes = [{ numberOfWinner: 1, prizeItem: '獎項1' }, { numberOfWinner: 1, prizeItem: '獎項2' }];

    drawPrize: Iterator<any>;

    *GetDrawPrize() {
        for (let i = 0; i < this.prizes.length; i++) {
            yield this.prizes[i];
        }
    }

    drawWinner() {
        this.drawPrize = this.drawPrize || this.GetDrawPrize();
        const prize = this.drawPrize.next();
        if (!prize.done) {
            // 抽出中獎者
            // prize.value 是目前要抽獎的品項
            console.log(prize.value);
        }
    }
}

let service = new SampleService();
service.drawWinner(); //{ numberOfWinner: 1, prizeItem: '獎項1' }
service.drawWinner(); //{ numberOfWinner: 1, prizeItem: '獎項2' }