I'm expanding my simple combat system into something a bit less simple and adding skill modifiers but I've hit a bit of a stumbling block. When I use the + operator to add a skill modifier to a die roll the 2 numbers are concatenated instead of added and producing a total.

Any help would be gratefully received.

    set("RatHealth", "4"); 
    set("RatCombatSkill", "1"); 
   
    
A large rat launches itself into the air, broken yellow teeth flashing.

<b>RAT</b><br>
COMBAT SKILL:1<br>
STRENGTH:1<br>
HEALTH:4<br>

[[attack the rat]](Rattack)
      
[[Rattack]]:
      var jsRatCombatskill = get("RatCombatSkill");
      var randomnumber = function rng(min, max) {
      return Math.floor(Math.random() * (max - min) + min);
    }
      var jsCombatroll = randomnumber(1,6);
      var jsCombatTotal = (jsCombatroll + jsRatCombatskill);
    
    set ("Monsterhit", jsCombatTotal);
    
    
The rat atttacks with a roll of  <b>{Monsterhit}</b> 

You're setting them as strings... set them as numbers instead

e.g.

set ("RatHealth", 4);

Argh! Cheers, Alex