Spiral

spiral.js

var x = 0,
	y = 0,
	dx = 0,
	dy = -1;

for(var i = 0; i < 10; i++) {
	if( (x == y) || ((x < 0) && (x == -y)) || ((x > 0) && (x == 1-y))){
		t = dx;
		dx = -dy;
		dy = t;
	}
	x += dx;
	y += dy;
	console.log({X: x, Y: y});
}