Re-Structuring a JSON

Question

OK guys need some help out there. I\'m still learning Javascript and its interactions JSON. I have a a JSON like this

[{
  \"categories\":\"Food\",
  \"subca         


        

Answer 1

I workout a solution, but I'm not sure how it will handle big json data. Assume that the json var stores your data:

categories = [];
json.forEach(function(entry) {  
    var cindex = categories.map(function(category) { 
        return category.name; 
    }).indexOf(entry.categories);

    if (cindex < 0) {
        // Not found in categories array
        cindex = categories.push({
            name: entry.categories,
            subcategories: []
        }) - 1; // -1 to fix the index
    }

    // Lets search the subcategory
    var category = categories[cindex];

    var sindex = category.subcategories.map(
        function(subcategory) {
            return subcategory.name;
        }
    ).indexOf(entry.subcategories);

    if (sindex < 0) {
      // Not Found
        sindex = category.subcategories.push({
            name: entry.subcategories,
            items: []
        }) - 1; 
    } 
    // Subcategory exists. Just push
    category.subcategories[sindex].items.push({
        pid: entry.pid,        
        description: entry.description,
        title: entry.title
    });
});

var menu = {
    menu: {
        categories: categories
    }
};

Working Fiddle