title: Search in Javascript object by index string value
body: <p>I am trying to iterate through an multidimensional object. I have string, which i have to match in the object index and get that value.
  for eg:</p>
  
  <pre><code>var datasets = {
      "usa:::west": {
          label: "USA",
          data: [[1988, 483994], [1989, 479060], [1990, 457648], [1991, 401949], [1992, 424705], [1993, 402375], [1994, 377867], [1995, 357382], [1996, 337946], [1997, 336185], [1998, 328611], [1999, 329421], [2000, 342172], [2001, 344932], [2002, 387303], [2003, 440813], [2004, 480451], [2005, 504638], [2006, 528692]]
      },        
      "russia:::north": {
          label: "Russia",
          data: [[1988, 218000], [1989, 203000], [1990, 171000], [1992, 42500], [1993, 37600], [1994, 36600], [1995, 21700], [1996, 19200], [1997, 21300], [1998, 13600], [1999, 14000], [2000, 19100], [2001, 21300], [2002, 23600], [2003, 25100], [2004, 26100], [2005, 31100], [2006, 34700]]
      }
  };
  </code></pre>
  
  <p>In this case i only have the string "usa" wherease in the object the index is "usa:::west". How can i search it?</p>