src/global.ts

@@ -233,7 +233,7 @@ export function ctor() {
 }
 
 Array.prototype.random = function (this: Array<any>) {
-    return this[PublicShared.randomNum(0, this.length - 1)];
+    return this[PublicShared.randomNum(0, this.length)];
 };
 
 Array.prototype.intersection = function (this: Array<any>, other: Array<any>) {