javascript - parseInt() returns NaN instead of integer -


i'm trying implement route-finder using javascript. so, create grid 2d array, , insert 'x' (walls), 'o' (open space), '0' (start), , 'g' (goal). increment open squares start goal, end looks this: '0',1,2,3,4,5 ... g

however, grid never goes past 0 , 1. console keeps returning nan remaining open spaces , suspect it's typeerror using parseint(). please see code below - appreciate help.

<!doctype html> <head> <link rel='stylesheet' type='text/css' href = 'routes.css'> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> </head> <body></body> <script> //o open space x wall var = [['0','o','x','x'],           ['x','o','o','o'],          ['x','o','x','o'],          ['x','o','o','g']];      /*printed grid looks var = [[0,1,'x','x'],           ['x',nan,nan,nan],          ['x',nan,'x',nan],          ['x',nan,nan,'g']];*/   function move(startr,startc){ //(0,0) startr,startc     var north = startr-1;      var south = startr+1;     var east = startc+1;     var west = startc-1;      //discard out of bounds locations     if (north<0){north=startr;}     if (south>3){south=startr;}     if (east>3){east=startc;}     if (west<0){west=startc;}       if (a[north][startc]=='o'){newlocation(north,startc,startr,startc);}     if (a[south][startc]=='o'){newlocation(south,startc,startr,startc);}     if (a[startr][west]=='o'){newlocation(startr,west,startr,startc);}     if (a[startr][east]=='o'){newlocation(startr,east,startr,startc);}  } //newlocation() increments square moved , pass new location function 'move '  function newlocation(northsouth,eastwest,origr,origc){      var origvalue = parseint(a[origr,origc]);     console.log(origvalue); //prints nan console     var newvalue = ++origvalue;     a[northsouth][eastwest]=newvalue;     console.log(a[origr,origc]);     return move(northsouth,eastwest); }  move(0,0);  //print board screen  (r=0;r<4;r++){     document.write('<br>');     (c=0;c<4;c++){         var l = document.createelement('div');         var t = document.createtextnode(a[r][c]);         $(l).addclass('letterboxes');         l.appendchild(t);         document.body.appendchild(l); //      document.body.appendchild(letter);     } }  </script> </html> 


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