Add countOutcomeBalance - balance successes/fails

dice.ts

@@ -32,6 +32,7 @@ interface DiceResult {
 	olddice?: Array<number>;
 	reroll?: boolean;
 	outcome?: Outcomes;
+	balance?: number;
 
 }
 
@@ -121,6 +122,18 @@ class Asphodice extends D10 {
 		return ((checkDice.filter(die => die >= this.successCutOff).length == 0));
 	}
 
+	countOutcomeBalance (resultDice: Array<number>): number{
+		// Return a positive / negative number representing
+		// the overall outcomes: each failure (eg < 6) is -1
+		// while each success (eg >= 6) is +1
+
+		// fun with ternary operators
+		return resultDice.reduce(
+			(acc: number, curr: number) =>
+			{ return (curr < this.successCutOff) ? acc - 1 : acc + 1 },
+			0);
+	}
+
 	roll (numToRoll: number): DiceResult {
 		let results: DiceResult = { total: 0, dice: [] };
 
@@ -172,6 +185,7 @@ class Asphodice extends D10 {
 			}
 		}
 
+		results.balance = this.countOutcomeBalance(results.dice);
 		results.total = results.dice.reduce((acc: number, curr: number) => acc + curr);
 		return results;
 	}