JSFiddle - React, Tailwind, and code Playground

HTML

Program code 
<textarea id=prog wrap=off></textarea>
Input (space separated)
<textarea id=inp></textarea>
<button onclick="Go()">GO</button>
<input name=Ex type=radio onclick="Ex(0)">Example 1
<input name=Ex type=radio onclick="Ex(1)">Example 2
<input name=Ex type=radio onclick="Ex(2)">Example 3
<input name=Ex type=radio onclick="Ex(3)">Example 4
<input name=Ex type=radio onclick="Ex(4)">Example 5
<br>Ouput
<textarea id=output readonly>
</textarea>

CSS

#prog {
  display: block;
  width: 98%;
  height: 20em         
}

#inp {
  display: block;
  width: 98%;
  height: 3em;
}

#output {
  display: block;
  width: 98%;
  height: 10em;
}
    
}

JavaScript

I=(c,i,k=1e5,
   V=v=>v in V?V[v]:v/9 // variable getter with default initial value
  )=>
   (c=>{
     for(p=o=''; 
       --k&&p<c[L='length'];)
       (v=(r=c[p++].split(' '))[S='shift']())? // no leading space
          r[r.map(t=>w-=(m=-m)*V(t),w=0,m=1),0]?V[v]=w // Assign
          :o+=v[L]&1?V(v):String.fromCharCode(V(v)&127) // Output
       : // else, leading space
        (v=r[S]())&&
           (r[0]?r.some(t=>V(t))?0:p=9*V(v) // Goto
           :(t=i[S](),V[v]=v[L]&1?t:t.charCodeAt()) // Input
        )
   })(c.replace(/ (?=[^9])|[^9\s]/g,'').split('\n'))  // code cleaning
   ||o



function Go()
{
    var prg=prog.value;
    var input=inp.value.split(' ')
    output.value = I(prg, input)
}

function Ex(e)
{
    var ex=[
    ["", "9\n9999   \n"],
    ["-57 A", " 9\n9\n 99\n99\n"],
    ["", "999           Prints triple-nine divided by nine (111)\n\
999 9 9       Assigns triple-nine to zero (nine minus nine)\n\
999           Prints triple-nine divided by nine (0)\n\
9 999 9       Assigns single-nine to negative nine (zero minus nine)\n\
999 999 9     Adds nine to triple-nine (really subtracts negative nine)\n\
999           Prints triple-nine divided by nine (1)\n\
999 999 9     Adds nine to triple-nine (really subtracts negative nine)\n\
999           Prints triple-nine divided by nine (2)\n\
999 999 9     Adds nine to triple-nine (really subtracts negative nine)\n\
999           Prints triple-nine divided by nine (3)\n"],
    ["", "9          Prints single-nine divided by nine (always 1).\n\
99 9 9     Assigns double-nine to zero.\n\
 99 99     Jumps to line zero (top line) if double-nine is zero.\n" ],
     ["", "99999999                                              Print G.\n\
999 99                                                Set triple-nine to ninety-nine.\n\
9999999999 9999999999 9999999999 99 99 9 9 999 999    Set 10-nine to zero.\n\
99999999999 9999999999                                Set 11-nine to zero.\n\
\n\
\n\
\n\
\n\
\n\
999         ...