Prints a grid to the console filled with random binary data

wayfinding.js

/*Common Algorithms*/
/*
  i = x + (y * width)
  //Index of Grid =  X coordinate * (Y coordinate * width)

  Math.floor(Math.random() + 0.5)
  //Randomly chooses between 0 and 1
*/

function Grid(x,y){
  genGrid(x,y);
  printGrid();
  findMiddle();
  return(str);
}
var grid = [];
var width, height;
var str = ''; //string to print to console

function genGrid(w,h){
  //clear grid and string
  grid = [];
  str = '';

  width = w;
  height = h;
  //incorrect inputs//////
  //incorrect inputs//////
  //incorrect inputs//////
  if (w === undefined &&
      h === undefined) {
      console.log('Enter grid size (x,y)');
    }else if (w === undefined){
      console.log('Enter grid size (x,y)');
    }
  //if only width
  //volume = width X width OR
  //if width and height are set
  //volume = width X heigth
  else if (h === null){
      vol = w*w;
  }else{
    var vol = w * h;
    }
  for (var i = 0; i < vol; i++){
    var cell = Math.floor(Math.random() + 0.5);
    grid.push(cell);
  }
}

function returnLocation(x,y){
  var i = x + (y * width);
  if (i > grid.length){
    return("not a location");
  }else{
    return grid[i];
  }
}

function printGrid(){
  str = str.concat('\n');
  for (var i = 0; i < height; i++){
    for (var j = 0; j < width; j++){
      str = str.concat(' ' + returnLocation(j,i));
    }str = str.concat('\n');
  }
}

function findMiddle(){
  //if value is even, choose random between middle two
  //else, grab middle value
  if(width % 2 == 0){
    this.x = (width / 2)-(Math.floor(Math.random() + 0.5));
  }else{
    this.x = (width/2) - 0.5;
  }
  if(height % 2 ==0){
    this.y = (height/2) - (Math.floor(Math.random() + 0.5));
  }else{
    this.y = height/2 - 0.5;
  }
  this.middleIndex = this.x + (this.y * width);
      
  console.log(this.x + "," + this.y);
  console.log(middleIndex);
}

function spawnBot(){
  //find middle spawn point
  //change value of spawn point to 0
  //spawn Bot in middle of Grid
    findMiddle().middleIndex;
    
}