- Processing
- p5.js
- Processing.py
- Processing for Android
- Processing for Pi

- Processing Foundation

This reference is for Processing 3.0+. If you have a previous version, use the reference included with your software in the Help menu. If you see any errors or have suggestions, please let us know. If you prefer a more technical reference, visit the Processing Core Javadoc and Libraries Javadoc.

Name | ### ! (logical NOT)
Examples |
    boolean a = false;
    if (!a) {
      rect(30, 20, 50, 50);
    }
    if (a) {
      line(20, 10, 90, 80);
      line(20, 80, 90, 10);
    }
    boolean a = true;
    if (!a) {
      rect(30, 20, 50, 50);
    }
    if (a) {
      line(20, 10, 90, 80);
      line(20, 80, 90, 10);
    }
Description | Inverts the Boolean value of an expression. Returns true if the expression is false and returns false if the expression is true. If the expression (a>b) evaluates to true, then !(a>b) evaluates to false.
Syntax |
    !expression
Parameters |
expression | any valid expression
Related | || (logical OR) && (logical AND) if

Updated on January 1, 2021 03:38:12am EST
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