From 25a7e4c4de61f26468b238c8297f181d7b20cd06 Mon Sep 17 00:00:00 2001
From: CJ Cenizal <cj@cenizal.com>
Date: Mon, 16 Jul 2018 10:28:55 -0700
Subject: [PATCH] Update JS style guide with rule for prefixing private class
 methods with an underscore.

---
 style_guides/js_style_guide.md | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/style_guides/js_style_guide.md b/style_guides/js_style_guide.md
index 1354f67009235..8a449230e70dd 100644
--- a/style_guides/js_style_guide.md
+++ b/style_guides/js_style_guide.md
@@ -215,6 +215,20 @@ class bank_account {}
 class bankAccount {}
 ```
 
+## Prefix private class methods with an underscore
+
+Identifying private class methods makes it easier to differentiate a class's public and internal
+APIs, and makes private methods easier to mark as `private` when the code is migrated to TypeScript.
+
+```js
+// good
+class BankAccount {
+  addFunds() {}
+
+  _calculateInterest() {}
+}
+```
+
 ## Magic numbers/strings
 
 These are numbers (or other values) simply used in line in your code. *Do not