JSMeth

JSMeth is a JavaScript implementation of brainfuck. The commands are the same, but they're expressed as JS methods.

Syntax

The syntax is simple. The language only includes a Tape object, with the following methods, all of which return the Tape itself upon calls.

Method	Result
.moveLeft()	Moves the tape pointer to the next cell.
.moveRight()	Moves the tape pointer to the previous cell.
.inc()	Increments the value of the cell by 1.
.dec()	Decrements the value of the cell.
.loop(f)	Executes the function f while the value of the current cell isn't 0.
.out()	Outputs the value of the current cell.
.in()	Accepts one byte of input and stores it to the current cell.

Example

Adder

The adder in BF is ,>,<[->+<]>.. The equivalent JSMeth code is Tape.in().moveRight().in().moveLeft().loop(function(){this.dec().moveRight().inc().moveLeft();}).moveRight().out();

Hello World

The HW program in BF is ++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++..

In JSMeth, it's

  Tape.inc().inc().inc().inc().inc().inc().inc().inc().loop(function(){this.moveRight().inc().inc().inc().inc().loop(function(){this.moveRight().inc().inc().moveRight().inc().inc().inc().moveRight().inc().inc().inc().moveRight().inc().moveLeft().moveLeft().moveLeft().moveLeft().dec();}).moveRight().inc().moveRight().inc().moveRight().dec().moveRight().moveRight().inc().loop(function(){this.moveLeft();}).moveLeft().dec();}).moveRight().moveRight().out().moveRight().dec().dec().dec().out().inc().inc().inc().inc().inc().inc().inc().out().out().inc().inc().inc().out().moveRight().moveRight().out().moveLeft().dec().out().moveLeft().out().inc().inc().inc().out().dec().dec().dec().dec().dec().dec().out().dec().dec().dec().dec().dec().dec().dec().dec().out().moveRight().moveRight().inc().out().moveRight().inc().inc().out();

Real JavaScript implementation

This is a real implementation of a Tape object constructor in JavaScript for browsers:

var Tape = function() {
	this.tape = [0];
	this.index = 0;
};
Tape.prototype.inc = function() {
	this.tape[this.index]++;
	return this;
};
Tape.prototype.dec = function() {
	this.tape[this.index]--;
	return this;
};
Tape.prototype.moveLeft = function() {
	this.index++;
	if (!this.tape[this.index]) this.tape[this.index] = 0;
	return this;
};
Tape.prototype.moveRight = function() {
	this.index--;
	if (!this.tape[this.index]) this.tape[this.index] = 0;
	return this;
};
Tape.prototype.out = function() {
	console.log(this.tape[this.index]);
	return this;
};
Tape.prototype.in = function() {
	this.tape[this.index] = prompt();
	return this;
};
Tape.prototype.loop = function(f) {
	while (this.tape[this.index] != 0)
		f.call(this);
	return this;
};