I just started using lodash and have this array of objects, where one of the properties either has an integer or is null. I know how to filter the array for items that are null, but how do I check if it's not null?

Let's say I have something like this:

var users = [

    { 'user': 'barney', 'default': 1 },

    { 'user': 'dino', 'default': 0 },

    { 'user': 'wilma', 'default': 1 },

    { 'user': 'fred',   'default': null }

];

And then I want something like:

var notNullDefault = _.filter(sourceData, ['is_default', ! null ]); // objects with names barney, dino, wilma

var nullDefault = _.filter(sourceData, ['is_default', null ]); // object with name fred

Again, I'm new to lodash, so maybe there's a better way to accomplish this too.

Thanks in advance.