Enumerate properties on an object

You have two options, using the Object.keys() and then forEach, or use for/in:

class stationGuide {
    station1: any;
    station2: any;
    station3: any;

    constructor(){
        this.station1 = null;
        this.station2 = null;
        this.station3 = null;
     }
}

let a = new stationGuide();
Object.keys(a).forEach(key => console.log(key));

for (let key in a) {
    console.log(key);
}

(code in playground)