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// Global code will be evaluated once. const turtle = new Turtle() turtle.penup() turtle.goto(-100,-100) turtle.pendown() var prevLine = 0 // The walk function will be called until it returns false. function walk(i) { var line = Math.floor(i / (Math.PI * 100 * 14)) if (line != prevLine) { turtle.penup() turtle.goto(-100, -100 + line * 25) turtle.setheading(0) prevLine = line turtle.pendown() } turtle.forward(1) turtle.right(Math.sin(i/100) * 90) return line < 9 }