array map

map

// create an empty array and hydrate it
var items = [];
data.map(function (item) {
    if (item.kind === 'track') {
        items.push({
            id: item.id,
            title: item.title,
            provider: self.provider,
            artist: item.user.username,
            artwork: item.artwork_url,
            length: (item.duration/1000),
            // meta: item
        });
    }
});

// let map return the new array
var items = data.map(function (item) {
    if (item.kind === 'track') {
        return{
            id: item.id,
            title: item.title,
            provider: self.provider,
            artist: item.user.username,
            artwork: item.artwork_url,
            length: (item.duration/1000),
            // meta: item
        });
    }
});