Calculating dice to use based on equation

Hello, I have an issue where the math is all wonky... I have a Dice Progression Chart which you roll from based on a simple equation: TL / Cost If the Tech Level is 32 And if you gain a +1 for every 4 levels (Cost... in levels) (This is an input field, the divisor changes). The total bonus should be +8 (32/4 = 8) I have the dice progression chart defined as such: /* DICE PROGRESSION CHART */             const dice_values = ['1d4', '1d6', '1d8', '1d10', '1d12', '1d20', '1D20+1D4', '1D20+1D6', '1D20+1D8', '1D20+1D10', '1D20+1D12', '1D20+1D20', '2D20+1D4', '2D20+1D6', '2D20+1D8', '2D20+1D10', '2D20+1D12', '2D20+2D20', '3D20+1D4', '3D20+1D6', '3D20+1D8', '3D20+1D10', '3D20+1D12', '3D20+3D20', '4D20+1D4', '4D20+1D6', '4D20+1D8', '4D20+1D10', '4D20+1D12', '4D20+4D20', '5D20+1D4', '5D20+1D6', '5D20+1D8', '5D20+1D10', '5D20+1D12', '5D20+1D20', '6D20+1D4', '6D20+1D6', '6D20+1D8', '6D20+1D10', '6D20+1D12', '6D20+1D20', '7D20+1D4', '7D20+1D6', '7D20+1D8', '7D20+1D10', '7D20+1D12', '7D20+1D20', '8D20+1D4', '8D20+1D6', '8D20+1D8', '8D20+1D10', '8D20+1D12', '8D20+1D20', '9D20+1D4', '9D20+1D6', '9D20+1D8', '9D20+1D10', '9D20+1D12', '9D20+1D20', '10D20+1D4', '10D20+1D6', '10D20+1D8', '10D20+1D10', '10D20+1D12', '10D20+1D20', '11D20+1D4', '11D20+1D6', '11D20+1D8', '11D20+1D10', '11D20+1D12', '11D20+1D20', '12D20+1D4', '12D20+1D6', '12D20+1D8', '12D20+1D10', '12D20+1D12', '12D20+1D20', '13D20+1D4', '13D20+1D6', '13D20+1D8', '13D20+1D10', '13D20+1D12', '13D20+1D20', '14D20+1D4', '14D20+1D6', '14D20+1D8', '14D20+1D10', '14D20+1D12', '14D20+1D20', '15D20+1D4', '15D20+1D6', '15D20+1D8', '15D20+1D10', '15D20+1D12', '15D20+1D20', '16D20+1D4', '16D20+1D6', '16D20+1D8', '16D20+1D10', '16D20+1D12', '16D20+1D20', '17D20+1D4', '17D20+1D6', '17D20+1D8', '17D20+1D10', '17D20+1D12', '17D20+1D20', '18D20+1D4', '18D20+1D6', '18D20+1D8', '18D20+1D10', '18D20+1D12', '18D20+1D20', '19D20+1D4', '19D20+1D6', '19D20+1D8', '19D20+1D10', '19D20+1D12', '19D20+1D20', '20D20+1D4', '20D20+1D6', '20D20+1D8', '20D20+1D10', '20D20+1D12', '20D20+1D20', '20D20+1D100', '5D100', '6D100', '7D100', '8D100', '9D100', '10D100+100',]; And here is the JS that does the calc to determine which dice to use. /* Repeating Inventory Weapon Dice Auto-Populator */                         on("change:repeating_weapons:weapontechlevel change:repeating_weapons:weapondamagecost", function() {                    getAttrs(["repeating_weapons_weapontechlevel","repeating_weapons_weapondamagecost"], function(values) {                             console.log(`values ${JSON.stringify(values)}`);                             let wd = parseInt(values.repeating_weapons_weapondamagecost) ;                             let tl = parseInt(values.repeating_weapons_weapontechlevel) / wd;                             console.log("tl: "+tl)                             let dice = dice_values[tl-1];                             console.log("dice: "+dice)                             setAttrs({repeating_weapons_weapondamage:dice});                         });             });     The answers it gives are not linear at all, and the sums jump around. Sometimes they are blank. I've tried it without the "/ wd". I don't understand the console.logs, either. Not sure why that is needed. Someone gave me this code.

Your worker looks properly constructed though I'd add || default like so: let wd = parseInt(values.repeating_weapons_weapondamagecost) || 1; let tl = (parseInt(values.repeating_weapons_weapontechlevel) || 0) / wd; Thats to make sure you are always getting a numerical value in those variables. I'd also constrain your dice value to min and max values to ensure the dice value doesn't break. let dice = dice_values[Math.min(dice.values.length-1 , Math.max(0, tl-1))]; This should solve the blank entries problem. The conole.logs are nt needed. You can delete them once you know the code is working. That's a simple form of debugging - the writer can see what the values are being calculated to be. Now, I don't know what you mean by the values jumping around. Is it calculating values wrongly? If so, which ones?

Hey GiGs. Yeah, instead of TL / #, it's TL + #.... or something. I didn't fully figure it out, it was random. Sometimes blank or just the wrong dice values. I'll try your edits! Thanks!