Is it possible to create an empty multidimensional array in javascript/jquery?

Question

I am trying to create a very basic Flickr gallery using the Flickr API. What I want to achieve is sorting my pictures by tag. What I am using is jQuery.getJSON() so that I c

Answer 1

var arr = [];
arr[0] = [];
arr[0][0] = [];
arr[0][0][0] = "3 dimentional array"

Multi dimentional arrays have a lot of gaps unless they are used properly. A two dimensional array is called a matrix.

I believe your data contains a space seperate string called "tags" containing the tags and a single url.

var tagObject = {};
data.photoset.photo.forEach(function(val) {
  val.tags.split(" ").forEach(function(tag) {
    if (!tagObject[tag]) {
      tagObject[tag] = [];
    }
    tagObject[tag].push(val.url_sq);
  });
});
console.log(tagObject); 
/*
  {
    "sea": ["url1", "url2", ...],
    "things": ["url4", ...],
    ...
  }
*/

I don't know how it returns multiple tags.