Fix invalid range problem with negative dice

juusaw · Feb 15, 2019 · e24c418 · e24c418
1 parent bb6347b
commit e24c418
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/src/dice.ts b/src/dice.ts
@@ -14,7 +14,9 @@ const roll = (sides: number) => Math.floor(Math.random() * sides + 1)
 
 export function rollDice(dice: Dice[]) {
   return dice.flatMap(([multiplier, sides]) => {
-    return new Array(multiplier).fill(undefined).map(() => roll(sides))
+    return new Array(Math.abs(multiplier))
+      .fill(undefined)
+      .map(() => multiplier / Math.abs(multiplier) * roll(sides))
   })
 }