Split string into an array of substrings or characters in MongoDB

Question

I need to convert fields like this:

{ 
    "_id" : ObjectId("576fd6e87d33ed2f37a6d526"), 
    "phoneme" : "JH OY1 N Z" 
}

into an arrays of substrings like this

{ 
    "_id" : ObjectId("576fd6e87d33ed2f37a6d526"), 
    "phonemes" : [ "JH", "OY1", "N", "Z" ] 
}

and sometimes into an array of characters like this

{
    "_id" : ObjectId("576fd6e87d33ed2f37a6d526"), 
    "phonemes" : ["J", "H", " ", "O", "Y", "1", " ", "N", " ", "Z"]
}

I found some code here which converts a string into an array, but it's a bit too simple for my purposes as there is only a single array element to be created.

db.members.find().snapshot().forEach( function (x) {
   x.photos = [{"uri": "/images/" + x.photos}];
   db.members.save(x);
 });

Is the entire javascript language available to me from within mongo shell statements?

Answer 1

Much easier than I thought. Just use JavaScript split function. boom!

db.temp.find().snapshot().forEach( function (el) {
el.phonemes = el.phoneme.split(' ');
db.temp.save(el);
});