Angular 2 - Get one property of object into array

Question

I have the following object

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

Now i want to fill an array with only the hours from the object.

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

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

How do i get the hours from the object into the hoursArray?

Nitzan Tomer · Accepted Answer · 2017-01-08 20:53:51Z

3

Use Array.prototype.map:

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

Also it can be:

private hoursArray: Array<string>;

Or simply:

private hoursArray: string[];

edited Jan 8, 2017 at 20:53

answered Jan 8, 2017 at 19:35

Nitzan Tomer

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Comments

Mateusz Woźniak · Accepted Answer · 2017-01-08 19:39:48Z

0

This way should work for you.

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);
       }
   });
}

answered Jan 8, 2017 at 19:39

Mateusz Woźniak

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