Rudimentary object-to-string implementation

gistfile1.js

function stringify(value) {
  if (typeof value === 'string') {
    return '"' + value.replace('"', '\"') + '"';
    
  } else if (!value || typeof value !== 'object') {
    return value;
  }
  
  if (Object.prototype.toString.call(value) === '[object Array]') {
    var entries = [];
      
    for (var i = 0; i < value.length; i++) {
      entries.push(stringify(value[i]));
    }
      
    return '[' + entries.join(',') + ']';
  }
  
  var properties = [];
  
  for (var key in value) {
    if (value.hasOwnProperty(key) && typeof value[key] !== 'function') {
      properties.push('"' + key + '":' + stringify(value[key]));
    }
  }

  return '{' + properties.join(',') + '}';
}

alert(stringify({
  firstName: 'Bryan',
  lastName: 'Irace',
  fullName: function() {
    return this.firstName + ' ' + this.lastName;
  },
  birthday: {
    day: 12,
    month: 8,
    year: 1986
  },
  languages: ['Java', 'Objective-C', 'JavaScript']
}));