Reference. Processing was designed to be a flexible software sketchbook.

! (logical NOT) != (inequality) % (modulo) & (bitwise AND) && (logical AND) () (parentheses) * (multiply) *= (multiply assign) + (addition) ++ (increment) += (add assign) , (comma) - (minus) -- (decrement) -= (subtract assign) . (dot) / (divide) /* */ (multiline comment) /** */ (doc comment) // (comment) /= (divide assign) ; (semicolon) < (less than) << (left shift) <= (less than or equal to) = (assign) == (equality) > (greater than) >= (greater than or equal to) >> (right shift) ?: (conditional) [] (array access) {} (curly braces) | (bitwise OR) || (logical OR)
abs() acos() alpha() ambient() ambientLight() append() applyMatrix() arc() Array arrayCopy() ArrayList asin() atan() atan2()
background() beginCamera() beginContour() beginRaw() beginRecord() beginShape() bezier() bezierDetail() bezierPoint() bezierTangent() bezierVertex() binary() blend() blendMode() blue() boolean() boolean box() break brightness() BufferedReader byte() byte
camera() case catch ceil() char() char class clear() clip() color() color colorMode() concat() constrain() continue copy() cos() createFont() createGraphics() createImage() createInput() createOutput() createReader() createShape() createWriter() cursor() curve() curveDetail() curvePoint() curveTangent() curveTightness() curveVertex()
day() default degrees() delay() directionalLight() displayDensity() dist() double DoubleDict DoubleList draw()
ellipse() ellipseMode() else emissive() endCamera() endContour() endRaw() endRecord() endShape() exit() exp()