VoidLang

A stack-based language. It supports eval, user input, loops, and basic math. It was designed by iovoid.

Operators

 * starts and end pushing to stack
 * prints the first element of stack, deleting it
 * multiply the two first elements of stack, deleting the originals
 * will divide the first element of stack with the seccond, deleting the originals
 * will add two first elements of stack, deleting the originals
 * will remove the first element of stack with the seccond, deleting the originals
 * starts a loop
 * ends a loop
 * breaks from a loop
 * break if the first element of stack is 0
 * break if the length of stack is 1 or 0
 * pop first element of the stack
 * adds a random item to the stack, from 1 to 255
 * push the length of the stack
 * replace first item of stack with it converted to a string, if impossible return the original
 * eval the concatenation of all elements in the stack, replaces stack with output
 * take a line of input from stdin
 * does nothing
 * push the program code to the stack
 * actually print the output (! is still needed)
 * end the program

Hello, World!
"Hello, World!"[#!] What's done here? First, " opens the pushing of items to stack (H,e,l,l,o,...), later " closes it. Inside a loop, every item of the stack is printed until its empty.

Other Hello World!
"89"*_!"ello World!/"[!#] Here, the / is pruoselly eaten by [!#] that will ignore the last character

REPL (Read-Eval-Print Loop)
,&[#!]$^& Here, input is asked with, and then & evals it. Later a [!#] prints everything, like in Hello, World!.

Cat program
,[#!]$^& ^& will repeat the program by eval-ing itself

Quine
^[#!]

Implementations
In Node.JS, by iovoid: https://gist.github.com/io4/c82798e6dfd918e37fe11f67283184a7