Foldy

Foldy is an esolang created by squareroot12621. It's a 2D esolang, like some others, but it starts out as 1D.

Documentation

In Foldy, the code starts out as 1D. You can fold it into 2D with the { and } commands.

...That's basically the main part of Foldy. The rest of the commands are in this table:

Instruction	Action
␣	No-op
0 to 9	Push 0 to 9 to the stack
+	Add the top two values on the stack
-	Subtract the top two values on the stack
*	Multiply the top two values on the stack
:	Integer-divide the top two values on the stack. Blows up if dividing by 0
< > ^ v	Force the IP to go in a certain direction
/ \ | _	Bounce the IP
$	If the top item on the stack is greater than 0, skip the next instruction
?	Replace the top of the stack with a random number in $[0,\,{\text{top of stack}})$
{	If fold mode is on: Fold the rest of the code counterclockwise
	If fold mode is off: Turn counterclockwise
}	If fold mode is on: Fold the rest of the code clockwise
	If fold mode is off: Turn clockwise
!	Print the top of the stack as a character
.	Print the top of the stack as a number
;	Get a character from input
,	Get a number from input
@	Terminate the code
&	Duplicate the top of the stack
~	Pop the top of the stack
[	Move the top of the stack to the bottom
]	Move the nth item on the stack to the top
#	Toggle fold mode. By default, this is on

Interpreters

• Python interpreter (GitHub)