Dynamically create variables of a object

Question

I am taking a json file and reorganizing it as a object in a new format (Not the same formatting as the json file I am reading, as I want to group variables differently) so I can use it. This requires creating a lot of variables with names that are unknown in advance.

I can dynamically create a new variable in my project like this:

object[variablename]

However, I would like to be able to do things like this

library[musicLibrary.Key].name = musicLibrary.alblum;

and

library[musicLibrary.Key].songs.[musicLibrary.title].name = musicLibrary.song;

Is there any way I can possibly do this?

My current looping code for the json looks like this:

var library = {}; 

for(var i = 0; i < musicList.songs.length; i++) {
//read json and reorganise it into a object
}

you can try use JSON.parse with reviver function what json you try parse? — Grundy
– Grundy, Commented Feb 7, 2014 at 5:08
library[musicLibrary.Key].name should be valid syntax...maybe you just need to add library[musicLibrary.Key]={} first? — Passerby
– Passerby, Commented Feb 7, 2014 at 5:11
JSON are you Arrays by Key stackoverflow.com/questions/684672/… — CubanAzcuy
– CubanAzcuy, Commented Feb 7, 2014 at 5:13
@Grundy I have seen that but it won't work for me becuase I am changing up the json file when I convert it into a object, It's not quite the same as the original json file. — joshua-anderson
– joshua-anderson, Commented Feb 7, 2014 at 5:14
@Passerby Thanks! That worked. And advice for my second piece? — joshua-anderson
– joshua-anderson, Commented Feb 7, 2014 at 5:16

jingyinggong · Accepted Answer · 2014-02-07 05:23:05Z

1

for(var i = 0; i < musicList.songs.length; i++) {
    var key = musicLibrary.Key;
    library[key] = library[key] || {};
    library[key]['name'] = musicLibrary.alblum;
    library[key]['songs'] = library[key]['songs'] || {};
    library[key]['songs'][musicLibrary.title] = library[key]['songs'][musicLibrary.title]  || {};
    library[key]['songs'][musicLibrary.title]['name'] = musicLibrary.song;
}

answered Feb 7, 2014 at 5:23

jingyinggong

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