Merge branch 'master' of https://github.com/QbDVision-Inc/node-style-guide into rsshilli-patch-1

Author: rsshilli

Readme.md

@@ -32,6 +32,7 @@ according to their preferences.
 * [Filenames](#filenames)
 
 ### Variables
+* [Use prefixes when naming booleans](#use-prefixes-when-naming-booleans)
 * [Never use var](#never-use-var)
 * [Object / Array creation](#object--array-creation)
 
@@ -312,17 +313,24 @@ Directories are snake case (ex. `webapp/controlMethods`)
 
 ### Use prefixes when naming booleans
 
-When naming booleans, use prefixes that give yes/no answers such as *is*, *has*, and *does*:
+When naming boolean variables (and functions that return booleans), use prefixes that give yes/no answers such as *is/are*, *has*, and *should*:
 
 *Good:*
 ```
 let isValid = true;
+let arePointersNull = false;
+let shouldRenderComponent = true;
+let hasLicense = true;
 ```
 
 *Bad:*
 ```
-let valid = true;  ← Bad
+let valid = true;
+let pointersNull = false;
+let renderComponent = true;
+let license = true;
 ```
+Note: Avoid boolean variables that represent the negation of a condition unless necessary e.g., use isValid instead of isNotValid
 
 ### Never use var