walks through object and generates hash where the key is the path with deliminator character and value

treewalk.js

  // https://jsfiddle.net/dlizik/x40fv8rk/
  
  function treewalk(obj, bucket, pathStr, delim) {
  
    var i, p, last = pathStr.slice(0, pathStr.length - 1);
        
    if (Array.isArray(obj)) {
      if (obj.length === 0)
        bucket[last] = obj;
      else {
        for (i = 0; i < obj.length; i++)
          treewalk(obj[i], bucket, pathStr + i + delim, delim)
      }
    }
      
    else if (Object.prototype.toString.call(obj) === '[object Object]') {
      if (Object.keys(obj).length === 0)
        bucket[last] = obj;               
      else {
        for (p in obj)
          treewalk(obj[p], bucket, pathStr + p + delim, delim);
      }
    }
      
    else if (typeof obj === 'number' || typeof obj === 'string' || obj === null) 
      bucket[last] = obj;
     
    else if (obj === undefined)
      throw new Error('cannot pass undefined');
      
    return bucket;
  }