Develop Reference

How to make JavaScript object from the given json string

I have a large json data that I have to parse and get object out of the following Json string. I added just top part of that large json data. I tried to parse it by
let obj = JSON.parse(this.state.data);
it doesn't work, it breaks with this msg "SyntaxError: Unexpected token L in JSON at position 0".
If I get the console.log by console.log(JSON.stringify(this.state.data, null, 2)); and try to validate output by online JSON validator, it says it is valid JSON data. Could you please tell me how can I parse it?
{
"content": [
{
"_id": 1,
"name": "Warehouse A",
"location": {
"lat": 47.13111,
"long": -61.54801
},
"cars": {
"location": "West wing",
"vehicles": [
{
"model": "GX",
"price": 27395.26,
"licensed": false,
"_id": 15,
"make": "Lexus",
"year_model": 2005,
"date_added": "2017-11-12T00:00:00.000+00:00"
},
{
"model": "Q",
"price": 6103.4,
"licensed": false,
"_id": 9,
"make": "Infiniti",
"year_model": 1995,
"date_added": "2017-11-13T00:00:00.000+00:00"
},
.........xxxxxx continue

Your variable this.state.data is not a JSON. It's a Javascript Object, just like JSON, So, Why not just use let obj = this.state.data;

RethinkDB indexing two fields with time

I have RethinkDB with data/table let say "news" with huge number of data row :
[
{
"author": "author1",
"category_id": "business",
"country": "id",
"created_at": "Wed Aug 15 2018 09:26:52 GMT+07:00",
"description": "description",
"id": "74c25662-7f94-47ef-8a7e-5091924819a9"
},
{
"author": "author2",
"category_id": "business",
"country": "id",
"created_at": "Wed Aug 15 2018 09:26:52 GMT+07:00",
"description": "description2",
"id": "74c25662-7f94-47ef-8a7e-5091924819a9"
},
{
"author": "author3",
"category_id": "sport",
"country": "id",
"created_at": "Wed Aug 15 2018 09:26:52 GMT+07:00",
"description": "description3",
"id": "74c25662-7f94-47ef-8a7e-5091924819a9"
},
{
"author": "author3",
"category_id": "business",
"country": "id",
"created_at": "Wed Aug 15 2018 09:26:52 GMT+07:00",
"description": "description4",
"id": "74c25662-7f94-47ef-8a7e-5091924819a9"
}
.....
]
I need to create index for category_id and created_at (timestamp) and query for certain category and filter by day now (certain date) only. I want to optimize and speed up for query result
I can do it in javascript by filter like this for category_id business and day 15 :
r.table("news").filter({category_id: 'business'}).filter(
r.row("created_at").day().eq(15)
)
But how I can create index for category_id and created_at and query it by certain day of created_at.
r.table("news").indexCreate( ???
thanks

Should be something like this:
r.table('news').indexCreate('businessAndDate', function (doc) {
return doc('category_id').add(doc('created_at').day().coerceTo('string'));
});
Then you can:
r.table('news').getAll('business15', {index: 'businessAndDate'})
You may want to insert a separator between the data (like 'business-15'), and use more than just the day (otherwise, why bother having a full timestamp?), that's up to you and how many .add you're willing to write. ;)
According to the reference, this is called an arbitrary index.

Matching for the Values in an array in javascript

I have bunch of objects in an array with format as below:
[
{
"card_details": {
"cardType": "gift"
},
"merchant_details": {
"merchantName": "Walter Heisenberg1",
"timeZone": "+05:30",
}
},
{
"card_details": {
"cardType": "coupon",
"cardTitle": "Coupon",
"messageUser": "Hi",
"punchCount": null,
"messageReachPunchLimit": "Get your Freebie!",
"merchantId": "59c214000e1a7825184cb813",
"expiryDate": "21 Sep 2019",
"discountPercent": "15",
"cardImageUrl": ""
},
"merchant_details": {
"merchantName": "Walter Heisenberg1",
"timeZone": "+05:30"
}
},
{
"card_details": {
"cardType": "punch",
"cardTitle": "BlueM2",
"messageUser": "Welcome!",
"expiryDate": "21 Sep 2019",
"punchCount": 25,
"messageReachPunchLimit": "Get your Freebie!",
"merchantId": "59c214000e1a7825184cb813",
"cardImageUrl": "http://139.59.179.111/cloopapi/undefined"
},
"merchant_details": {
"merchantName": "Walter Heisenberg1",
"timeZone": "+05:30"
}
}
]
I want to filter the objects based on cardType in the card_details object. But I want to search from the array. For example, if I search for ["coupon","gift"], then I should get the all the cards which have the card_details.cardType as coupon or gift.
I need to be able to do this in Node.js,i.e., Javascript.

You can use ES6 filter and includes functions here:
collection.filter(item => ['coupon', 'gift'].includes(item.card_details.cardType))

Using groupBy and map to transform data using LoDash and Moment

I am inexperienced with lodash, but I believe it can help me transform data into a desired format. I have tried varying level of methods described in the documentation, but I can not wrap my head around everything. I've looked here on SO, a few blogs, and the documentation. I have tried combining groupby and map, but I was unable to resolve the issue. I was also unsure how to log the steps.
Here is what I want to do, I want to take the following array and turn it into the array after it. Can anyone point me in the right direction?
Original Data
var mockData = [
{
"notice_title": "Bad news",
"notice_text": "Server is down!",
"start_date": "2016-09-18T04:00:00Z"
},
{
"notice_title": "Weekly Reminder",
"notice_text": "Please read the assignment!",
"start_date": "2016-09-18T04:00:00Z"
},
{
"notice_title": "Sweet",
"notice_text": "This morning, the new edition of our blog hit stands!",
"start_date": "2016-09-19T04:00:00Z"
},
{
"notice_title": "Yeah",
"notice_text": "This is pretty cool",
"start_date": "2016-09-19T04:00:00Z"
}
Desired Data
var newMockData = [
{
"date": "JAN 18 2016",
"messages": [{
"notice_title": "Bad news",
"notice_text": "Server is down!",
"start_date": "2016-09-18T04:00:00Z"
},
{
"notice_title": "Weekly Reminder",
"notice_text": "Please read the assignment!",
"start_date": "2016-09-18T04:00:00Z"
}],
"date": "JAN 19 2016",
"messages": [{
"notice_title": "Sweet",
"notice_text": "This morning, the new edition of our blog hit stands!",
"start_date": "2016-09-19T04:00:00Z"
},
{
"notice_title": "Yeah",
"notice_text": "This is pretty cool",
"start_date": "2016-09-19T04:00:00Z"
}]
}]
Updated lodash
var result = _.chain(mockData)
.groupBy(function(item) {
return moment(item.start_date.substring(0,10)).format("MMM-DD-YYYY");
})
.map((value, key) => {
return {
date: key,
param: value
}
})
.value();

I did answer a very similar question yesterday, however, I will still provide an answer here by modifying the previous one
var mockData = [
{
"notice_title": "Bad news",
"notice_text": "Server is down!",
"start_date": "2016-09-18T04:00:00Z"
},
{
"notice_title": "Weekly Reminder",
"notice_text": "Please read the assignment!",
"start_date": "2016-09-18T04:00:00Z"
},
{
"notice_title": "Sweet",
"notice_text": "This morning, the new edition of our blog hit stands!",
"start_date": "2016-08-19T04:00:00Z"
},
{
"notice_title": "Yeah",
"notice_text": "This is pretty cool",
"start_date": "2016-09-19T04:00:00Z"
}
]
var result = _.chain(mockData)
.groupBy(datum => moment(datum.start_date).format("MMM DD YYYY").toLocaleUpperCase() )
.map((messages, date) => ({ date, messages })) //using ES6 shorthand to generate the objects
.value();
console.log(result);
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.15.1/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.16.1/lodash.min.js"></script>
The key thing here is that when using _.groupBy, you can supply a function that defines how objects are collected together. In this case, this is using Moment.js in order to format the start_date of the messages into Month-day-year format:
moment(datum.start_date).format("MMM DD YYYY")`
this will parse the date of the message and output it in <Short month> <day> <year> format. See more on formatting in the documentation. This value is then converted to upper case to transform "Sep" to "SEP"
The second thing is just generating the new structure inside the .map. Since all the information needed is already present formatted like so
{
"Sep 18 2016": [{
"notice_title": "Bad news",
"notice_text": "Server is down!",
"start_date": "2016-09-18T04:00:00Z"
}, {
"notice_title": "Weekly Reminder",
"notice_text": "Please read the assignment!",
"start_date": "2016-09-18T04:00:00Z"
}],
"Aug 19 2016": [{
"notice_title": "Sweet",
"notice_text": "This morning, the new edition of our blog hit stands!",
"start_date": "2016-08-19T04:00:00Z"
}],
"Sep 19 2016": [{
"notice_title": "Yeah",
"notice_text": "This is pretty cool",
"start_date": "2016-09-19T04:00:00Z"
}]
}
It's a simple matter of getting the keys and turning them into a property and the values and being added as another property.

Kimono: Function to modify data, explode string and add new a new property

I'm using Kimono to extract some data and create an API:
{
"name": "site update",
"count": 4,
"frequency": "Manual Crawl",
"version": 1,
"newdata": true,
"lastrunstatus": "success",
"thisversionstatus": "success",
"thisversionrun": "Sun Feb 07 2016 05:13:26 GMT+0000 (UTC)",
"results": {
"collection1": [
{
"title": {
"href": "http://www.tvtrailers.com/scenes/view/id/9418/title-1/",
"text": "Title 1"
},
"pubDate": "February 6, 2016",
"index": 1,
"url": "http://www.tvtrailers.com/home/"
},
{
"title": {
"href": "http://www.tvtrailers.com/scenes/view/id/9422/title-2/",
"text": "Title 2"
},
"pubDate": "February 6, 2016",
"index": 2,
"url": "http://www.tvtrailers.com/home/"
},
{
"title": {
"href": "http://www.tvtrailers.com/scenes/view/id/9358/title-3/",
"text": "Title 3"
},
"pubDate": "February 5, 2016",
"index": 3,
"url": "http://www.tvtrailers.com/home/"
},
{
"title": {
"href": "http://www.tvtrailers.com/scenes/view/id/9419/title-4/",
"text": "Title 4"
},
"pubDate": "February 5, 2016",
"index": 4,
"url": "http://www.tvtrailers.com/home/"
}
]
}
}
I'm trying to GET the value of href inside the title element, then
explode the string to obtain the id number (9418, 9422, 9358, 9419 on the code above) and create a new property with just the id number.
Or, if is not possible to create a new property, then I would like to just replace all the href string and keep the id number instead of the full href url.
Here is the code I'm using: -Not working
function getpost_number(data) {
var post_number = 0;
for(var href in data.results) {
data.results[href].forEach(function(row) {
var parts = row.split("/");
console.log(parts[5]+parts[6]);
});
};
data.post_number = post_number;
return data;
}
Result:
{
"error": "Bad Request",
"message": "Your function failed to evaluate because of Error: Object object has no method 'split'"
}
Also the code inspector inside kimono had 2 warnings:
On line 7: Don't make functions within a loop.
On line 8: Unnecessary semicolon
I appreciate any help and directions to figure out what's wrong with the code above,
thank you.
Addendum - new attempt
Here is the updated function I'm using with the code provided by Trincot on the comments below:
function addPostNumbers(data) {
for(var collection in data.results) {
data.results[collection].forEach(function(row) {
if (parts = row.title.href.match(/\/(\d+)\//)) {
row.title.post_number = parts[1];
}
});
}
}
Output:
{
"error": "Bad Request",
"message": "Your function failed to evaluate because of Error: parts is not defined"
}
Kimono Inspector warnings
line 5: Assignment in conditional expression.
line 8: Don't make functions within a loop.

The data you provided originally was not valid JSON, as it had more closing braces than opening ones, and it had some curly double quotes. This was fixed in your question later.
Here is a function that will add the post_number property in the title objects, provided that the href property contains a folder name that is numerical.
When you run this snippet, it will output the result (JSON) with the additional properties:
function addPostNumbers(data) {
var collection, rows, i, parts;
for (collection in data.results) {
var rows = data.results[collection];
for (i=0; i<rows.length; i++) {
parts = rows[i].title.href.match(/\/(\d+)\//);
if (parts) {
rows[i].title.post_number = parts[1];
}
}
}
return data;
}
// test data
var data = {
"name": "site update",
"count": 4,
"frequency": "Manual Crawl",
"version": 1,
"newdata": true,
"lastrunstatus": "success",
"thisversionstatus": "success",
"thisversionrun": "Sun Feb 07 2016 05:13:26 GMT+0000 (UTC)",
"results": {
"collection1": [
{
"title": {
"href": "http://www.tvtrailers.com/scenes/view/id/9418/title-1/",
"text": "Title 1"
},
"pubDate": "February 6, 2016",
"index": 1,
"url": "http://www.tvtrailers.com/home/"
},
{
"title": {
"href": "http://www.tvtrailers.com/scenes/view/id/9422/title-2/",
"text": "Title 2"
},
"pubDate": "February 6, 2016",
"index": 2,
"url": "http://www.tvtrailers.com/home/"
},
{
"title": {
"href": "http://www.tvtrailers.com/scenes/view/id/9358/title-3/",
"text": "Title 3"
},
"pubDate": "February 5, 2016",
"index": 3,
"url": "http://www.tvtrailers.com/home/"
},
{
"title": {
"href": "http://www.tvtrailers.com/scenes/view/id/9419/title-4/",
"text": "Title 4"
},
"pubDate": "February 5, 2016",
"index": 4,
"url": "http://www.tvtrailers.com/home/"
}
]
}
};
// don't add this to your code. Kimono will do this (I suppose):
addPostNumbers(data);
// write result in document, don't add this in your own code
document.write('<pre>' + JSON.stringify(data, null, 2) + '</pre>');
Concerning the warnings you received:
On line 7: Don't make functions within a loop.
You can ignore this warning. This is intended to avoid that the runtime has to create a function again and again, because it is defined within a loop. Here it concerns the forEach callback function, where the forEach call appears in a loop itself. However, with the forEach construct most runtimes will parse this efficiently.
On line 8: Unnecessary semicolon
This concerns the semi-colon after the closing brace of your for-loop. You should remove that one.
Addendum - feed back
You tried a previous version of my code (present now in your question) and listed some problems raised by Kimono, which seems to have its own Javascript parser and to apply stricter rules than the browser:
line 5: Assignment in conditional expression.
I have updated the above code, moving the assignment out of the conditional expression.
line 8: Don't make functions within a loop.
I had written earlier that this warning can be ignored, but now I have replaced the foreach loop as a standard for loop, so you should not get this warning any more.
line 16: document.write can be a form of eval
The calls to the functions addPostNumbers and document.write are only in my snippet to demo the solution. That part of the code is not intended to be used in your code.
"message": "Your function failed to evaluate because of Error: parts is not defined"
I added a var statement in the code above to avoid this.
I also added a return statement, as Kimono might need that as well, I don't know.

Your row is going to look like this:
{
"title": {
"href": "http://www.tvtrailers.com/scenes/view/id/9358/title/“,
"text": "Title 1"
},
"pubDate": "February 5, 2016",
},
"index": 1,
"url": "http://www.tvtrailers.com/videos/thismonth/bydate/"
}
Which means you want to dig deeper and split on row.title.href
Also, I'm not sure which pieces your are hoping to retrieve, but parts[5] will equal "id" and parts[6] will equal 9358. That is because the // after http: will create an empty item between "http:" and "www.tvtrailers.com".
In other words you split array will look like this:
["http:", "", "www.tvtrailers.com", "scenes", "view", "id", "9358", "title", ""]