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Iterate through array of objects,not giving required output

given code
[
{
"data": [
{
"text_name": "test",
"text_url": "https://www.news18.com/topics/gold-prices/1",
"is_new": "1"
},
{
"text_name": "test2",
"text_url": "https://www.news18.com/topics/gold-prices/2",
"is_new": "0"
}
],
"slug": "bollywood",
"heading": "testing",
"status": "1",
"is_open_new": "1",
"order_data": "2",
"section_dropdown": "bollywood"
}
]
I want to iterate through this given code snippet and get the data.
const trendingTopicsData = trendingTopics.data
but this is showing null

Since the object in the snippet is an array, first you have to get the index of the item you want to work with (in this case the first item — index 0). Then you can iterate through the data array however you want (loop, forEach, map etc.).
Try:
const trendingTopicsData = trendingTopics[0].data
Here it is as a runnable snippet:
const trendingTopics = [
{
"data": [
{
"text_name": "test",
"text_url": "https://www.news18.com/topics/gold-prices/1",
"is_new": "1"
},
{
"text_name": "test2",
"text_url": "https://www.news18.com/topics/gold-prices/2",
"is_new": "0"
}
],
"slug": "bollywood",
"heading": "testing",
"status": "1",
"is_open_new": "1",
"order_data": "2",
"section_dropdown": "bollywood"
}
]
// Get trending topics data array
const trendingTopicsData = trendingTopics[0].data;
console.log("Data array:", trendingTopicsData)
// Iterate through each of the items in the data array
trendingTopicsData.forEach((dataItem, index) => console.log(`Data item #${index}:`, dataItem));

The object you are trying to access is inside an array. You will have to loop through the array
trendingTopics.forEach(topic => {
// do something with topic.data
})

Nested forEach issue

I have two arrays of object, the first array (printers, around 80 elements) is made of the following type of objects:
[{
printerBrand: 'Mutoh',
printerModel: 'VJ 1204G',
headsBrand: 'Epson',
headType: '',
compatibilty: [
'EDX',
'DT8',
'DT8-Pro',
'ECH',
],
cartridges: [],
},
....
]
The second array (cardridges, around 500 elements) is made of the following type of objects:
[
{
"customData": {
"brand": {
"value": {
"type": "string",
"content": "ECH"
},
"key": "brand"
},
"printer": {
"value": {
"type": "string",
"content": "c4280"
},
"key": "printer"
}
},
"name": "DT8 XLXL",
"image": {
"id": "zLaDHrgbarhFSnXAK",
"url": "https://xxxxxxx.net/images/xxxxxx.jpg"
},
"brandId": "xxxxx",
"companyId": "xxxx",
"createdAt": "2018-03-26T14:39:47.326Z",
"updatedAt": "2018-04-09T14:31:38.169Z",
"points": 60,
"id": "dq2Zezwm4nHr8FhEN"
},
...
]
What I want to do first is to is to iterate through the first array and and then iterate for all the cardridge available: if a the value customData.brand.value of a cardridge is included inside the array 'compatibility' of a printer, then I have to add this cardridge object inside the cardridges array of this printer. I have tried but somehow the iteration doesn't take place correctly. This is what I tried:
printers.forEach((printerItem) => {
const printer = printerItem;
printer.compatibilty.forEach((compatibilityItem) => {
const compatibility = compatibilityItem;
cardridges.forEach((cartridge) => {
if (compatibility === cartridge.customData.brand.value.content) {
printer.cartridges.push(cartridge);
}
});
});
});
What am I doing wrong?

You're accessing the wrong property. It should be cartridge.customData.brandName.value.content, carefully note brandName.value rather than brand.value

Your issue is that you're accessing it by the wrong property - brand and not brandName.
Furthermore, if you're targeting everything but IE, you could simplify your nested for loops to utilize some fancy ES6 array methods.
printers.forEach((p) => {
p.cartridges.push(cartridges.filter((c) => {
const brandName = c.customData.brandName.value.content;
return p.compatibilty.includes(brandName);
}));
});

Replace array element from rethinkdb if it exists,or else insert

{
"LOGIN": "ABC",
"MESSAGE_UNPROCESSED": [
{
"DATE": "20160219",
"MESSAGE": [
{
"address": "XYZ",
"date": "1468385398746"
},
{
"address": "PQR",
"date": "1468385398746"
}
]
},
{
"DATE": "20160220",
"MESSAGE": [
{
"address": "LMN",
"date": "1468385398746"
},
{
"address": "JXT",
"date": "1468385398746"
}
]
}
],
"id": "e1705cae-2a57-42b3-af2e-8458ae9a43bb"
}
I want to add message into the field where Login is ABC if DATE doesn't exist or if it exist I want to replace the entire object from doc
I tried this :
r.db('usersData').table('smsRaw').filter(function (row) {
return row('MESSAGE_UNPROCESSED')('DATE').contains('20160222').replace({"DUMP":"DUMP"})
})
error: Cannot nest writes or meta ops in stream operations. Use FOR_EACH instead in:
r.db("usersData").table("smsRaw").filter(function(var_13) {
return var_13("MESSAGE_UNPROCESSED")("DATE").contains("20160222").replace({"DUMP": "DUMP"});
})
so if records {"DATE":"2016018","MESSAGE":[{"address":"abc","Date":"121212"}]}
if this record doesn't exist in MESSAGE_UNPROCESSED it should be added using set_insert or else if date is existing like 2016020 then entire element from array should be replaced
r.db('usersData').table('smsRaw').get("7cd66671-bb01-483d-a148-12ed1b7c2d31").update(function(row) {
return {
MESSAGE_UNPROCESSED: r.branch(
row("MESSAGE_UNPROCESSED")('DATE').eq('20160222'),
row("MESSAGE_UNPROCESSED")('MESSAGE').merge({"DUMP":"DUMP"}),
row("MESSAGE_UNPROCESSED")('MESSAGE').replace({"NEW":"NEW"})
)
}
})
Cannot nest writes
I want to do this manipulation using python

Iterate through nested Javascript Objects from API response

I've tried 100 different things, and spend days looking through Google and Stackoverflow, but I can't find a solution to this problem. Everything I call after the body of this API response returns undefined!
The response from Facebook SDK looks like this:
[
{
"body": "[
"data": [
{
"name": "Larry Syid Wright",
"administrator": false,
"id": "xxx"
}, {
"name": "Melissa Long Jackson",
"administrator": false,
"id": "xxx"
}, {
"name": "Charlotte Masson",
"administrator": false,
"id": "xxx"
}
],
"paging": {
"next": "url"
}
]"
},{
"body": "{
"data": [
{
"id": "xxx_xxx",
"message": "In honor of Halloween, how many of you have your own ghost stories? Who believes in ghosts and who doesn't?",
"type": "status",
"created_time": "2014-10-31T20:02:01+0000",
"updated_time": "2014-11-01T02:52:51+0000",
"likes": {
"data": [
{
"id": "xxx",
"name": "Joe HerBatman Owenby Jr."
}
],
}
"paging": {
"cursors":
{
"after": "xxx",
"before": "xxx"
}
}
}
},{
"id": "xxx_xxx",
"from": {
"id": "xxx",
"name": "Jessica Starling"
},
"message": "Watching the "Campaign" and I can't help but notice what a fantastic job they did (Will ferrell and all) with that North Carolina accent! Ya'll know we sound different than other southern states ;)",
"type": "status",
"created_time": "2014-11-01T02:36:21+0000",
"updated_time": "2014-11-01T02:36:21+0000",
"likes": {
"data": [
{
"id": "xxx",
"name": "Scott Williams"n
}
]
}
}
],
"paging": {
"previous": "xxx",
"next": "xxx"
}
}"
}
]
This response is from a batch call. If I call them separately, I can easily iterate through the responses, and get everything from them. When I call them in the batch though, I can't get past "body", and I need to use a batch call.
console.log(response[0].body); will return the object inside the body of the first part of the response, but console.log(response[0].body.data); returns undefined. I just don't get it. This should be simple but it's like there's a lock on the door and I don't have the right key.
I normally have no issue iterating through objects, so I don't need a generalized answer. I need help seeing whatever it is here that I don't see. Why does the console show undefined when I call anything after the body, and what do I need to be doing to get any of these values?

That JSON contains nested JSON. body seems to be a string. Use
var body = JSON.parse(response[0].body);

The values from the body are just strings.which are embedded as json.So firstly you would need to parse them using JSON.parse.
The code would be like
var body = JSON.parse(response[0].body);

basic java script json child array decoding

I have been teaching myself some basic javascript the last couple of days and playing with google scripting as well as the twitter api and have come a bit unstuck on something that should probably be quite easy!
For sake of easierness of typing so my return from twitter api looks like this
[id:1
connections: "NONE"
],
[id:2
connections: ["following", "followed_by"]
]
What I am trying to do is find out out if the key 'following' exists for user 2, but I am really struggling!
The twitter api docs show an examples json as
[
{
"name": "Taylor Singletary",
"id_str": "819797",
"id": 819797,
"connections": [
"none"
],
"screen_name": "episod"
},
{
"name": "Twitter API",
"id_str": "6253282",
"id": 6253282,
"connections": [
"following",
"followed_by"
],
"screen_name": "twitterapi"
}
]
Can any point me in the correct direction?, how do I find out if following exists?
Thanks

connections: ["following", "followed_by"] is an array. To check if an array contains a special value you can use indexOf():
var a = [1, 2, "three", 44];
a.indexOf(1); // 0
a.indexOf(2); // 1
a.indexOf("three"); // 2
a.indexOf(22); // -1
So to check if "following" is in the array:
if (connections.indexOf("following") !== -1) {
// yeah!
} else {
// doh!
}
To count the objects in your example which have "following":
var o = [
{
"name": "Taylor Singletary",
"id_str": "819797",
"id": 819797,
"connections": [
"none"
],
"screen_name": "episod"
},
{
"name": "Twitter API",
"id_str": "6253282",
"id": 6253282,
"connections": [
"following",
"followed_by"
],
"screen_name": "twitterapi"
}
];
var withFollowing = o.filter(
function (i) {
return i.connections.indexOf("following") !== -1;
}
);
// filter() returns a new array
// this new array has only the elements for which the function returns true
console.log(withFollowing.lenght);