Global and Local Variables

sketch.js

/* variables declared outside of functions are
   are called "global" as they can be referred to
   anywhere. */
   
var g_variable = 50;

function setup() {
  createCanvas(400,400);
  /* variables declared inside of a function are
  only available in that specific function.
    
  */
  var l_variable = 30;
  ellipse(l_variable, g_variable, 10, 10);
  
}

function draw() {
  ellipse(100, 100, g_variable, g_variable)
  
}