Dynamic updates to GB via AddGraphicsScript and Eval/Expr - throwing "Name Unresolved"

Question

namesdefaulttohere(1);
try(nw3<<close window);

toggle = expr(
	x = random integer(10,90);
	y = random integer(10,90);

foreach({key}, map,
		gb = map[key];
		f = gb[framebox(1)];
		f << add graphics script(
			eval(expr( text({x,y}, key) ))
		)
	)
);

vlb = vlistbox();
map = [=>];

foreach({alpha}, words("a b c"),
	map[alpha] = graphbox(suppress axes, frame size(100,100));
	vlb<<append( map[alpha] )
);

nw3 = new window("ex",outlinebox("what",
	{"toggggggle", toggle},
	vlb
))

Error:

Name Unresolved: key in access or evaluation of 'key' , key/*###*/

mtowle419 · Accepted Answer

Figured it out. Rather than reach for the value of `key` at eval time, we can save it when initializing the GB. Here, we're calling it `beta`, but key/beta are just references to one of words("a b c")

toggle = expr(
	x = random integer(10,90);
	y = random integer(10,90);

foreach({key}, map,
		gb = map[key];
		f = gb[framebox(1)];
		f << add graphics script(
			eval(eval expr( text({x,y}, expr(beta)) )) // change #1
		)
	)
);

vlb = vlistbox();
map = [=>];

foreach({alpha}, words("a b c"),
	map[alpha] = eval(eval expr(graphbox(suppress axes, frame size(100,100),

beta = expr(alpha); // change #2 (plus wrapping GB in eval/eval expr

)));
	vlb<<append( map[alpha] )
);

nw3 = new window("ex",outlinebox("what",
	{"toggggggle", toggle, "toggle2", toggle2},
	vlb
))