BestFriends.js

BestFriends.js is a two-dimensional esoteric programming language invented in 2006 by David Millar with the goal of creating an esoteric javascript library.

A BestFriends.js script is very similar to Brainfuck. It has almost exactly the same commands, except for the addition of a few new ones.

Instructions

The code is written in your JavaScript like this: BF(command string,input string);

Example, creates a popup with the letter 'd' on it:

var c = "+++++[>+++++<-]>}|" +
        "[<++++>-]<.@    {";
alert(BF(c,"input"));

BestFriends.js has the following commands:

Command	Description
`+`	Add 1 to current memory cell.
`-`	Subtract 1 from the current memory cell.
`>`	Move the memory pointer to the right.
`<`	Move the memory pointer to the left.
`[`	Start a loop. You CANNOT use nested loops in BestFriends.
`]`	End of a loop. If current memory cell is 0, continues program, otherwise restarts loop.
`{`	Turns the program pointer 90 degrees left (anticlockwise).
`}`	Turns the program pointer 90 degrees right (clockwise).
`!`	Clear output string.
`:`	Run eval() on output string.
`@`	Ends the script and returns the output string.
`\|`	Separates rows of commands.
`,`	Puts the first character of the input string in the current memory cell. As of the first version, this command does not work. The problem is being looked at carefully.
`.`	Writes the ascii character of the current memory cell to the output string.
Anything else is a comment.