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for..in loop returns undefined

consider this example
let obj = {
"minute": {
"data": [
{
"s": [0],"values": {
"TV Web": {
"P": [0],
"S": [0]
}
}
},
{ },
],
"product": ["Tom"]
},
"ads": { },
}
for(let entry in obj){
console.log(obj[entry].product[0])
}
if you run the snippet it shows "TOM" and undefined.
How can I select only Tom? without having undefined?

you can just directly access to that path obj["minute"].product[0];
if you want check in all of property, then you can skip undefined value
for(let entry in obj){
if (obj[entry].product){
console.log(obj[entry].product[0]);
}
// or use ternari
obj[entry].product && console.log(obj[entry].product[0]);
// or use library like `lodash`
console.log(lodash.get(obj[entry], "product[0]"));
}

Sorting an array of objects by object key

How do I sort this array of objects by checking the objects' key?
const list = [
{ "firstValue": { "a": "1" } },
{ "secondValue": { "b": "1" } },
{ "thirdValue": { "c": "1" } },
{ "fourthValue": { "d": "1" } },
{ "fifthValue": { "e": "1" } }
]
So in this case I want it to be sorted like:
const list = [
{ "fifthValue": { "e": "1" } },
{ "firstValue": { "a": "1" } },
{ "fourthValue": { "d": "1" } },
{ "secondValue": { "b": "1" } },
{ "thirdValue": { "c": "1" } }
]
This is my current code:
sortArrOfObjectsByKey(list);
document.write(JSON.stringify(list))
function sortArrOfObjectsByKey(arrToSort) {
arrToSort.sort(function(a, b) {
return a < b ? -1 : 1
});
}
But it doesn't get sorted correctly.
Please note that there shouldn't be any new container for the new sorted array/object.
Help! Thanks

You need to fetch property name and then sort according to that
const list = [
{ "firstValue": { "a": "1" } },
{ "secondValue": { "b": "1" } },
{ "thirdValue": { "c": "1" } },
{ "fourthValue": { "d": "1" } },
{ "fifthValue": { "e": "1" } }
]
list.sort( function(a, b) {
const aKey = Object.keys(a)[0];
const bKey = Object.keys(b)[0];
return aKey.localeCompare(bKey)
} );
console.log(list)

Loop through JSON data in javascript

I have a php script returning JSON encoded data like below:
{
"1":
{
"from":"Vimbai Jongwe",
"msg":"wadii"
},
"2":
{
"from":"Brian Dube",
"msg":"Eh Chibaba"
}
}
So now i want to access that data using the keys from and msg to be displayed somewhere.

You can loop it like below
var data = {
"1":
{
"from":"Vimbai Jongwe",
"msg":"wadii"
},
"2":
{
"from":"Brian Dube",
"msg":"Eh Chibaba"
}
}
for(var d in data){
console.log(data[d].from +"->"+data[d].msg);
}

Try below code you can loop and print as in below code
a = {
"1":
{
"from":"Vimbai Jongwe",
"msg":"wadii"
},
"2":
{
"from":"Brian Dube",
"msg":"Eh Chibaba"
}
};
for(var i in a){
console.log(a[i].from);
console.log(a[i].msg);
}

Pull out certain nested objects

I have a series of nested objects like this:
data = {"12345":{"value":{"1":"2","3":"4"}},
{"12346":{"value":{"5":"6","7":"8"}},
{"12347":{"value":{"9":"0","11":"22"}}
I would like to create a function to grab certain objects within this grouping. For example...
grabObject(12345);
would return:
{"value":{"1":"2","3":"4"}}
Any help you could provide would be great.

You don't need anything more than this:
function grabObject(id) {
return data[id];
}
After making some fixes to your syntax, here's a working jsFiddle: http://jsfiddle.net/jfriend00/04no0bvm/

var data = [
{
"12345": {
"value": {
"1": "2",
"3": "4"
}
}
},
{
"12346": {
"value": {
"5": "6",
"7": "8"
}
}
},
{
"12347": {
"value": {
"9": "0",
"11": "22"
}
}
}
];
function grabObject(id) {
var result;
for (i = 0; i < data.length; i++) {
for (var k in data[i]){
if(k == id) {
result = data[i][k];
}
}
}
return result;
}
console.log(grabObject('12345'));
This is the code I tested check and let me know

Change JSON string structure

I have a JSON string which looks like this:
[
{
"queryResult": {
"A": "12-04-2014",
"B": 1
}
},
{
"queryResult": {
"A": "13-04-2014",
"B": 2
}
},
{
"queryResult": {
"A": "14-04-2014",
"B": 3
}
}
]
And I need to parse it and change it to this
[
{
"A": "12-04-2014",
"B": 1
},
{
"A": "13-04-2014",
"B": 2
},
{
"A": "14-04-2014",
"B": 3
}
]
I already have a function for making that change, which is:
function justAnExample() {
var jsonData = exampleJSON(); //Obtains the JSON
var finalJSON=JSON.stringify(jsonData[0]['queryResult']);
for (var i = 1; i < jsonData.length; i++) {
finalJSON = finalJSON+','+JSON.stringify(jsonData[i]['queryResult']);
}
return JSON.parse('[' + finalJSON + ']');
}
But, this method uses stringifying and then parsing JSON to recreate the JSON object, which works, but is there a better solution, in which I can work with the object notation itself.
P.S: I know the term "JSON object" is a semi-pseudo thing, and that only the JSON notation/format matters, but, just need to confirm if this is the proper way to do it.
Edit
Please find a JS fiddle for the problem
http://jsfiddle.net/mukilr/uJV54/

You can do:
var json = [
{
"queryResult": {
"A": "12-04-2014",
"B": 1
}
},
{
"queryResult": {
"A": "13-04-2014",
"B": 2
}
},
{
"queryResult": {
"A": "14-04-2014",
"B": 3
}
}
];
var out = [];
for (var i = 0; i < json.length; i++){
out[i] = json[i].queryResult;
}
check this fiddle
EDIT
This is your fiddle updated