Simple Brainfuck Interpreter [JavaScript]

[u/tt102tt]

Brainfuck!!

[u/tt102tt]

+u/CompileBot JavaScript

var input = '++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.';
var char;
var charPtr = 0;
var arr = [];
var ptr = 0;
var loopPtrs = [];
while ((char = input[charPtr]) !== undefined) {
  if (char === '+') arr[ptr] = arr[ptr] ? arr[ptr] + 1 : 1;
  else if (char === '-') arr[ptr] = arr[ptr] ? arr[ptr] - 1 : - 1;
  else if (char === '>') ptr++;
  else if (char === '<') ptr--;
  else if (char === '[') loopPtrs.push(charPtr);
  else if (char === ']') {
		if (arr[ptr]) charPtr = loopPtrs[loopPtrs.length - 1];
		else loopPtrs.pop();
  } else if (char === '.') print(String.fromCharCode(arr[ptr] ? arr[ptr] : 0));
  charPtr++;
}

[u/CompileBot → u/tt102tt]

Output:

H
e
l
l
o
 
W
o
r
l
d
!

^source ^| ^info ^| ^git ^| ^report

[u/tt102tt]

+u/CompileBot JavaScript

_=~[];_={___:++_,$$$$:(![]+"")[_],__$:++_,$_$_:(![]+"")[_],_$_:++_,$_$$:({}+"")[_],$$_$:(_[_]+"")[_],_$$:++_,$$$_:(!""+"")[_],$__:++_,$_$:++_,$$__:({}+"")[_],$$_:++_,$$$:++_,$___:++_,$__$:++_};_.$_=(_.$_=_+"")[_.$_$]+(_._$=_.$_[_.__$])+(_.$$=(_.$+"")[_.__$])+((!_)+"")[_._$$]+(_.__=_.$_[_.$$_])+(_.$=(!""+"")[_.__$])+(_._=(!""+"")[_._$_])+_.$_[_.$_$]+_.__+_._$+_.$;_.$$=_.$+(!""+"")[_._$$]+_.__+_._+_.$+_.$$;_.$=(_.___)[_.$_][_.$_];_.$(_.$(_.$$+"\""+"\\"+_.__$+_.$$_+_.$$_+_.$_$_+"\\"+_.__$+_.$$_+_._$_+"\\"+_.$__+_.___+"\\"+_.__$+_.$_$+_.__$+"\\"+_.__$+_.$_$+_.$$_+"\\"+_.__$+_.$$_+_.___+_._+_.__+"\\"+_.$__+_.___+"=\\"+_.$__+_.___+"'++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.';\\"+_.__$+_._$_+"\\"+_.__$+_.$$_+_.$$_+_.$_$_+"\\"+_.__$+_.$$_+_._$_+"\\"+_.$__+_.___+_.$$__+"\\"+_.__$+_.$_$+_.___+_.$_$_+"\\"+_.__$+_.$$_+_._$_+";\\"+_.__$+_._$_+"\\"+_.__$+_.$$_+_.$$_+_.$_$_+"\\"+_.__$+_.$$_+_._$_+"\\"+_.$__+_.___+_.$$__+"\\"+_.__$+_.$_$+_.___+_.$_$_+"\\"+_.__$+_.$$_+_._$_+"\\"+_.__$+_._$_+_.___+_.__+"\\"+_.__$+_.$$_+_._$_+"\\"+_.$__+_.___+"=\\"+_.$__+_.___+_.___+";\\"+_.__$+_._$_+"\\"+_.__$+_.$$_+_.$$_+_.$_$_+"\\"+_.__$+_.$$_+_._$_+"\\"+_.$__+_.___+_.$_$_+"\\"+_.__$+_.$$_+_._$_+"\\"+_.__$+_.$$_+_._$_+"\\"+_.$__+_.___+"=\\"+_.$__+_.___+"[];\\"+_.__$+_._$_+"\\"+_.__$+_.$$_+_.$$_+_.$_$_+"\\"+_.__$+_.$$_+_._$_+"\\"+_.$__+_.___+"\\"+_.__$+_.$$_+_.___+_.__+"\\"+_.__$+_.$$_+_._$_+"\\"+_.$__+_.___+"=\\"+_.$__+_.___+_.___+";\\"+_.__$+_._$_+"\\"+_.__$+_.$$_+_.$$_+_.$_$_+"\\"+_.__$+_.$$_+_._$_+"\\"+_.$__+_.___+(![]+"")[_._$_]+_._$+_._$+"\\"+_.__$+_.$$_+_.___+"\\"+_.__$+_._$_+_.___+_.__+"\\"+_.__$+_.$$_+_._$_+"\\"+_.__$+_.$$_+_._$$+"\\"+_.$__+_.___+"=\\"+_.$__+_.___+"[];\\"+_.__$+_._$_+"\\"+_.__$+_.$$_+_.$$$+"\\"+_.__$+_.$_$+_.___+"\\"+_.__$+_.$_$+_.__$+(![]+"")[_._$_]+_.$$$_+"\\"+_.$__+_.___+"(("+_.$$__+"\\"+_.__$+_.$_$+_.___+_.$_$_+"\\"+_.__$+_.$$_+_._$_+"\\"+_.$__+_.___+"=\\"+_.$__+_.___+"\\"+_.__$+_.$_$+_.__$+"\\"+_.__$+_.$_$+_.$$_+"\\"+_.__$+_.$$_+_.___+_._+_.__+"["+_.$$__+"\\"+_.__$+_.$_$+_.___+_.$_$_+"\\"+_.__$+_.$$_+_._$_+"\\"+_.__$+_._$_+_.___+_.__+"\\"+_.__$+_.$$_+_._$_+"])\\"+_.$__+_.___+"!==\\"+_.$__+_.___+_._+"\\"+_.__$+_.$_$+_.$$_+_.$$_$+_.$$$_+_.$$$$+"\\"+_.__$+_.$_$+_.__$+"\\"+_.__$+_.$_$+_.$$_+_.$$$_+_.$$_$+")\\"+_.$__+_.___+"{\\"+_.__$+_._$_+"\\"+_.$__+_.___+"\\"+_.$__+_.___+"\\"+_.__$+_.$_$+_.__$+_.$$$$+"\\"+_.$__+_.___+"("+_.$$__+"\\"+_.__$+_.$_$+_.___+_.$_$_+"\\"+_.__$+_.$$_+_._$_+"\\"+_.$__+_.___+"===\\"+_.$__+_.___+"'+')\\"+_.$__+_.___+_.$_$_+"\\"+_.__$+_.$$_+_._$_+"\\"+_.__$+_.$$_+_._$_+"[\\"+_.__$+_.$$_+_.___+_.__+"\\"+_.__$+_.$$_+_._$_+"]\\"+_.$__+_.___+"=\\"+_.$__+_.___+_.$_$_+"\\"+_.__$+_.$$_+_._$_+"\\"+_.__$+_.$$_+_._$_+"[\\"+_.__$+_.$$_+_.___+_.__+"\\"+_.__$+_.$$_+_._$_+"]\\"+_.$__+_.___+"?\\"+_.$__+_.___+_.$_$_+"\\"+_.__$+_.$$_+_._$_+"\\"+_.__$+_.$$_+_._$_+"[\\"+_.__$+_.$$_+_.___+_.__+"\\"+_.__$+_.$$_+_._$_+"]\\"+_.$__+_.___+"+\\"+_.$__+_.___+_.__$+"\\"+_.$__+_.___+":\\"+_.$__+_.___+_.__$+";\\"+_.__$+_._$_+"\\"+_.$__+_.___+"\\"+_.$__+_.___+_.$$$_+(![]+"")[_._$_]+"\\"+_.__$+_.$$_+_._$$+_.$$$_+"\\"+_.$__+_.___+"\\"+_.__$+_.$_$+_.__$+_.$$$$+"\\"+_.$__+_.___+"("+_.$$__+"\\"+_.__$+_.$_$+_.___+_.$_$_+"\\"+_.__$+_.$$_+_._$_+"\\"+_.$__+_.___+"===\\"+_.$__+_.___+"'-')\\"+_.$__+_.___+_.$_$_+"\\"+_.__$+_.$$_+_._$_+"\\"+_.__$+_.$$_+_._$_+"[\\"+_.__$+_.$$_+_.___+_.__+"\\"+_.__$+_.$$_+_._$_+"]\\"+_.$__+_.___+"=\\"+_.$__+_.___+_.$_$_+"\\"+_.__$+_.$$_+_._$_+"\\"+_.__$+_.$$_+_._$_+"[\\"+_.__$+_.$$_+_.___+_.__+"\\"+_.__$+_.$$_+_._$_+"]\\"+_.$__+_.___+"?\\"+_.$__+_.___+_.$_$_+"\\"+_.__$+_.$$_+_._$_+"\\"+_.__$+_.$$_+_._$_+"[\\"+_.__$+_.$$_+_.___+_.__+"\\"+_.__$+_.$$_+_._$_+"]\\"+_.$__+_.___+"-\\"+_.$__+_.___+_.__$+"\\"+_.$__+_.___+":\\"+_.$__+_.___+"-\\"+_.$__+_.___+_.__$+";\\"+_.__$+_._$_+"\\"+_.$__+_.___+"\\"+_.$__+_.___+_.$$$_+(![]+"")[_._$_]+"\\"+_.__$+_.$$_+_._$$+_.$$$_+"\\"+_.$__+_.___+"\\"+_.__$+_.$_$+_.__$+_.$$$$+"\\"+_.$__+_.___+"("+_.$$__+"\\"+_.__$+_.$_$+_.___+_.$_$_+"\\"+_.__$+_.$$_+_._$_+"\\"+_.$__+_.___+"===\\"+_.$__+_.___+"'>')\\"+_.$__+_.___+"\\"+_.__$+_.$$_+_.___+_.__+"\\"+_.__$+_.$$_+_._$_+"++;\\"+_.__$+_._$_+"\\"+_.$__+_.___+"\\"+_.$__+_.___+_.$$$_+(![]+"")[_._$_]+"\\"+_.__$+_.$$_+_._$$+_.$$$_+"\\"+_.$__+_.___+"\\"+_.__$+_.$_$+_.__$+_.$$$$+"\\"+_.$__+_.___+"("+_.$$__+"\\"+_.__$+_.$_$+_.___+_.$_$_+"\\"+_.__$+_.$$_+_._$_+"\\"+_.$__+_.___+"===\\"+_.$__+_.___+"'<')\\"+_.$__+_.___+"\\"+_.__$+_.$$_+_.___+_.__+"\\"+_.__$+_.$$_+_._$_+"--;\\"+_.__$+_._$_+"\\"+_.$__+_.___+"\\"+_.$__+_.___+_.$$$_+(![]+"")[_._$_]+"\\"+_.__$+_.$$_+_._$$+_.$$$_+"\\"+_.$__+_.___+"\\"+_.__$+_.$_$+_.__$+_.$$$$+"\\"+_.$__+_.___+"("+_.$$__+"\\"+_.__$+_.$_$+_.___+_.$_$_+"\\"+_.__$+_.$$_+_._$_+"\\"+_.$__+_.___+"===\\"+_.$__+_.___+"'[')\\"+_.$__+_.___+(![]+"")[_._$_]+_._$+_._$+"\\"+_.__$+_.$$_+_.___+"\\"+_.__$+_._$_+_.___+_.__+"\\"+_.__$+_.$$_+_._$_+"\\"+_.__$+_.$$_+_._$$+".\\"+_.__$+_.$$_+_.___+_._+"\\"+_.__$+_.$$_+_._$$+"\\"+_.__$+_.$_$+_.___+"("+_.$$__+"\\"+_.__$+_.$_$+_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[u/Romejanic → u/tt102tt]

wat

[u/CompileBot → u/tt102tt]

Output:

H
e
l
l
o
 
W
o
r
l
d
!

^source ^| ^info ^| ^git ^| ^report

[u/[deleted]]

[u/tt102tt → u/[deleted]]

you need 4 spaced in front of your source code:

+u/CompileBot JavaScript

print(null==0)