Add prefer_extracted_top_level_constant analyzer comment (#2368)

* Add prefer_extracted_top_level_constant analyzer comment to javascript resistor color duo (exercism/javascript-analyzer#127)

* Format analyzer-comments/javascript/resistor-color-duo/prefer_extracted_top_level_constant.md

Co-authored-by: Derk-Jan Karrenbeld <[email protected]>

* add exported method to prefer_extracted_top_level_constant in js resistor_color_duo

---------

Co-authored-by: Derk-Jan Karrenbeld <[email protected]>

Author: Steffe-Dev

analyzer-comments/javascript/resistor-color-duo/prefer_extracted_top_level_constant.md

@@ -0,0 +1,14 @@
+# prefer extracted top level constant
+
+Consider extracting the constant to the top level scope:
+
+```javascript
+const %{name} = %{value}
+
+// the rest of your code below it
+export %{method.signature}
+```
+
+Only functions, classes and constants that are `export`ed, are visible and accessible from the outside.
+These constants can live in the same file without being exposed to other code.
+Also, extracting constants saves memory by avoiding repeated allocations in functions when those same constants are reused.