Update free-programming-playgrounds.md (#4677)

* Update free-programming-playgrounds.md * Update free-programming-playgrounds.md

Update free-programming-playgrounds.md (#4677)
* Update free-programming-playgrounds.md * Update free-programming-playgrounds.md
ca4ecfce · If-Then-andSometimesElse · GitHub · b6bcd6f8 · ca4ecfce
隐藏空白更改
内联并排

Showing with 1 addition and 0 deletion

free-programming-playgrounds.md free-programming-playgrounds.md +1 -0

未找到文件。
--- a/free-programming-playgrounds.md
+++ b/free-programming-playgrounds.md
@@ -194,6 +194,7 @@
 ### Ruby

 * [Codepad](http://codepad.org)
+* [Sololearn](https://code.sololearn.com/#rb)
 * [TryRuby](https://try.ruby-lang.org)