Avoid double negative logic

Conditional logic should avoid double negatives. e.g., "Is this not not true?"

Why

• Double negatives are hard to comprehend.

How

• Write logic that asks: Is this true. Instead of: Is this not not true?

Example

A double negative conditional, which is hard to understand:

if (!isNotSelected) {
    ...

Then written in the positive:

if (isSelected) {
   ...

References

• https://derickbailey.com/2014/03/27/double-negatives-in-code-dont-not-avoid-double-negative-boolean-logic/
• https://refactoring.com/catalog/removeDoubleNegative.html
• https://principles.dev/p/logic-in-positive/