I have the following snippet code which, within a loop, creates a JavaScript object where some of the properties maybe undefined:reader.on('record', function(record) {    let p = record.children;    let player = {};    // below we create a dynamic key using an object literal obj['name'], this allows use to use    // the id as the firebase reference id.    player[p[0].text] = {        id: parseInt(p[0].text, 10) || ,        name: p[1].text || ,        country: p[2].text ||     };};My question therefore; is there a better way for creating this object via a 'Map' for example? If the properties are undefined then do not add them to the object. Note: This data is being sent to a Firebase DB, so any undefined values throw an error -- my crude (but working) approach is to add them as an empty string.Here is a sample of the JSON I would like to see (notice country is not missing from the second player):{ players : {    100001 : {      id : 100001,      name : Matt Webb,      country : ENG    },    100002 : {      id : 100002,      name : Joe Bloggs,    }}
Creating json objects with undefined properties
javascript;ecmascript 6;firebase