Range slider, getting min/max handle value to variable

Range slider, getting min/max handle value to variable

Hi,
I am completely newbie, working mostly on ready made code fragments. I am learning using 2-handles slider with some data analytics, e.g. selecting data ranges from an array based slider range.

How can I do below:
min-max: 1-5
after moving handles: 2-4

varLOW = 2;
varHIGH = 4;

Thanks
Horsten