diff --git a/JavaScript/1-simple.js b/JavaScript/1-simple.js
index b267ec4..870ad62 100644
--- a/JavaScript/1-simple.js
+++ b/JavaScript/1-simple.js
@@ -17,6 +17,8 @@ class AccountQuery {
 }
 
 class BankAccount {
+  static collection = new Map();
+
   constructor(name) {
     this.name = name;
     this.balance = 0;
@@ -28,8 +30,6 @@ class BankAccount {
   }
 }
 
-BankAccount.collection = new Map();
-
 const operations = {
   Withdraw: command => {
     const account = BankAccount.find(command.account);
diff --git a/JavaScript/2-scale.js b/JavaScript/2-scale.js
index 74513a8..4fa605f 100644
--- a/JavaScript/2-scale.js
+++ b/JavaScript/2-scale.js
@@ -20,6 +20,8 @@ class AccountQuery {
 }
 
 class BankAccount {
+  static collection = new Map();
+
   constructor(name) {
     this.name = name;
     this.balance = 0;
@@ -31,8 +33,6 @@ class BankAccount {
   }
 }
 
-BankAccount.collection = new Map();
-
 const operations = {
   Withdraw: command => {
     const account = BankAccount.find(command.account);