function key_value_pairs(obj)   
   {  
    var keys = _keys(obj);  
    var length = keys.length;  
    var pairs = Array(length);  
    for (var i = 0; i < length; i++)   
    {  
      pairs[i] = [keys[i], obj[keys[i]]];  
    }  
    return pairs;  
  }  
  
function _keys(obj)   
  {  
    if (!isObject(obj)) return [];  
    if (Object.keys) return Object.keys(obj);  
    var keys = [];  
    for (var key in obj) if (_.has(obj, key)) keys.push(key);  
    return keys;  
  }  
function isObject(obj)   
 {  
    var type = typeof obj;  
    return type === 'function' || type === 'object' && !!obj;  
  }  
console.log(key_value_pairs({red: "#FF0000", green: "#00FF00", white: "#FFFFFF"})); 