class_example.js

function control_zone() {
  this.var_a = 'a';
  this.var_b = 'b';
  this.var_c = 'c';
  
  this.do_stuff = function() {
    // do stuff with variables
    console.log('var_a: '+this.var_a);
    console.log('var_b: '+this.var_b);
    console.log('var_c: '+this.var_c);
    console.log('var_d: '+this.var_d);
  }
}



var zone1 = new control_zone();
var zone2 = new control_zone();


zone1.var_a = 'zone1 a';
zone1.var_b = 'zone1 b';
zone1.var_c = 'zone1 c';
zone1.var_d = 'zone1 d';

console.log('calling zone1');
zone1.do_stuff();


zone2.var_a = 'zone2 d';
zone2.var_b = 'zone2 e';
zone2.var_c = 'zone2 f';

console.log('calling zone2');
zone2.do_stuff();