Angular 2 - 将对象的一个​​属性转换为数组

Question

我有以下对象

export class HourPerMonth {
    constructor(
        public year_month: string,
        public hours: string,
        public amount: string
    ) { };
}

现在我想用一个只有几小时来填充一个数组。

private hourPerMonth: HourPerMonth[];
private hoursArray: Array<any>;

getChartData() {
    this.chartService.getHoursPerMonth().subscribe(source => {
        this.hourPerMonth = source;
        this.hoursArray = ?
    });
}

如何将对象的小时数输入hoursArray？

Answer 1

使用https://youtu.be/zQt7GGkR7As?t=5m31s：

?>

也可以是：

this.hoursArray = source.map(obj => obj.hours);

或者简单地说：

private hoursArray: Array<string>;

Answer 2

这种方式适合你。

private hourPerMonth: HourPerMonth[];
private hoursArray: Array<any> = [];

getChartData() {
   this.chartService.getHoursPerMonth().subscribe(source => {
       this.hourPerMonth = source;
       this.hourPerMonth.forEach(hourPerMonth => {
          this.hoursArray.push(hourPerMonth.hours);
       }
   });
}