how to get values of latitude and longtude on two variables

Question

How to store values of loc[0] and loc[1] on two variables latitude and longtude

and what type of two variables ?

let lati:string;
let long:string;

this.partDetailsService.getLocationData(locationArr).subscribe(res => {
                console.log(res);
        res.forEach((item, index) => {
            let dataLocation = res[index]['_source']['GPS1'];
            console.log(dataLocation);
            let loc = dataLocation.split(',');
            console.log("After");
            console.log(loc);    success
            console.log(loc[0].trim());   success
            console.log(loc[1].trim());  success
            lati=loc[0].trim();
            long=loc[1].trim();
         });
latitude= result of loc[0].trim after loop finish
longtude= result of loc[1].trim after loop finish
and what datatype assigned to two variables ?

 

suppose I have on dataLocation that store GPS1 as following

52,70

30,40

20,60

50,100

then

latitude variable will have 52,30,20,50

longtude variable will have 70,40,60,100

Ho to create two variables that can give me values above ?