$_$

This is still a work in progress. It may be changed in the future.

$_$ (pronounced sus) is an esolang by Cortex where strings of a certain character are commands. It was named after the first two characters added, _ and $. Newlines are optional.

A new, 1.5-dimensional (you'll see what that is when I finish the new version) version of $_$, Sus++ is currently being worked on. This page describes the old version. Sus++ will most likely be finished by January 20th. If it is, in fact, finished, click here. (nevermind)

Constants

Name	Default value
s	Empty string. See _ and $

Commands

In this table, N represents the number of characters. (for the call ____________, N would equal 12)

Character	What it does	Category
_	Append the character with the ASCII value N to s.	I/O
-	Like _, but prepend the character to s instead.	I/O
$	Print the value of s, and reset it to an empty string if N is odd.	I/O
&	Separate calls of the same character.	Control
@	Create label N.	Labels
!	Assign the most recently created label to the Nth character call.	Labels
#	Go to label N.	Labels
.	Stop executing.	Control
%	Begin or end a comment.	Control
?	Ask the user for input and append it to s.	I/O
+	Append the source of the (N-1)th call in the program to s. If N is 1, the entire source code is stored in s.	I/O
1	Begin defining a new miniprogram N.	Miniprograms
2	Stop defining miniprogram N.	Miniprograms
3	Add the Nth character in this list to the miniprogram. Followed by a 4 call.	Miniprograms
4	Determines N for the character added in the previous 3 call as the N of this 4 call.	Miniprograms
5	Run miniprogram N.	Miniprograms
z	Wait N seconds.	Control
;	Print the lyrics to All Star by Smash Mouth N times.	I/O
*	Interpret s as source code. Inspired by InterpretMe	I/O

Examples

Hello, World!

________________________________________________________________________&_____________________________________________________________________________________________________&____________________________________________________________________________________________________________&____________________________________________________________________________________________________________&_______________________________________________________________________________________________________________&____________________________________________&________________________________&_______________________________________________________________________________________&_______________________________________________________________________________________________________________&__________________________________________________________________________________________________________________&____________________________________________________________________________________________________________&____________________________________________________________________________________________________&_________________________________$.

Cat program

?$.

Quine

+$. % 

Technically this gets the entire source code, making it a cheating quine

Skip the first . call and become a cat program

@!!!!!#.?$.

Define a miniprogram containing the cat program, and run it

133333333343343333333425

Self-interpreter

?*.

Implementations

An interpreter has been implemented in perl by Sxakalo. You can check it out here