Pyramid

Simple pyramid with centered squares.

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```// You can find the Turtle API reference here: https://turtletoy.net/syntax
Canvas.setpenopacity(1);

// Global code will be evaluated once.
const turtle = new Turtle();
const iterations = 1000;

// The walk function will be called until it returns false.
function walk(i) {
//Draw a square with length the size of our current iteration.
square(0,0,i);
//If this is the final iteration, return false to terminate.
return i < iterations;
}

function square(x,y,a) {
let rad = a / 2;
turtle.penup();
//Postion the center of the square at given coordinates.
turtle.goto(x,y);
//Make sure our first move will take us 'north'.
turtle.setheading(90);
//Move north by half the length of the square to intersect the first edge.
turtle.forward(rad);
//Turn right and move another half length
//to get to the first 'corner' point. (top right corner).
turtle.right(90);
turtle.forward(rad);
//Get ready to draw!
turtle.pendown();
//Draw the square, leaving the pen in the top right corner when done.
turtle.right(90);
turtle.forward(a);
turtle.right(90);
turtle.forward(a);
turtle.right(90);
turtle.forward(a);
turtle.right(90);
turtle.forward(a);
}```