Good practice when naming a Boolean variable/Property

<soapbox>

When defining a Boolean (true/false) variable or property

1. Prefix the name with "Is" or "Has"
2. Do not negate in your variable name.

Bad Boolean variables names:

• Allowed (No prefix)
• IsNonUser (Negated Name)
• IsNotAllowed (Negated Name)
• Permission (No prefix)

Good boolean variable names:

• IsAllowed
• IsUser
• IsAllowed
• HasPermission

Why?

Because if statements with negation become easier to read.

I think this if statement is harder to read

   1: if(!IsNotAllowed) 

   2: { 

   3:     ShareCandy(); // "If not is not allowed then share candy"

   4: } 

Then this if statement

   1: if(IsAllowed) 

   2: { 

   3:     ShareCandy(); // "If is allowed then share candy"

   4: } 

</soapbox>