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.



void setup() {  // setup() does not return a value
  size(200, 200);

void draw() {  // draw() does not return a value
  line(10, 100, 190, 100);

void drawCircle() {  // This function also does not return a value
  ellipse(30, 30, 50, 50);
Description Keyword used indicate that a function returns no value. Each function must either return a value of a specific datatype or use the keyword void to specify it returns nothing.
void function {
function any function that is being defined or implemented
statements any valid statements
Updated on January 1, 2021 03:38:12am EST