We Keep Coding

Convert array into json

i have data which is an array like:
arr=["[[name,address,contact],[name1,address1,contact1],[name2,address2,contact2]]"]
How to change this array in json and get those value in a table in react.

Use json.parse
arr=["[[name,address,contact],[name1,address1,contact1],[name2,address2,contact2]]"]
let datax = JSON.parse(arr[0].replace(/(\w+)/g, '"$1"'));
console.log(datax)

Immutable.js Map values to array

I am using the immutable Map from http://facebook.github.io/immutable-js/docs/#/Map
I need to get an array of the values out to pass to a backend service and I think I am missing something basic, how do I do it ?
I have tried :
mymap.valueSeq().toArray()
But I still get an immutable data structure back ?
For example :
var d = '[{"address":"10.0.35.118","cpus":4}]';
var sr = JSON.parse(d);
var is = Immutable.fromJS(sr);
console.log(sr);
console.log(is.toArray());
console.log(is.valueSeq().toArray());
See this http://jsfiddle.net/3sjq148f/2/
The array that we get back from the immutable data structure seems to still be adorned with the immutable fields for each contained object. Is that to be expected ?

Just use someMap.toIndexedSeq().toArray() for getting an array of only values.

It's because the sr is an Array of Object, so if you use .fromJS to convert it, it becomes List of Map.
The is.valueSeq().toArray();(valueSeq is not necessary here.) converts it to Array of Map, so you need to loop through the array, and convert each Map item to Array.
var d = '[{"address":"10.0.35.118","cpus":4}]';
var sr = JSON.parse(d);
// Array of Object => List of Map
var is = Immutable.fromJS(sr);
console.log(sr);
console.log(is.toArray());
// Now its Array of Map
var list = is.valueSeq().toArray();
console.log(list);
list.forEach(function(item) {
// Convert Map to Array
console.log(item.toArray());
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/immutable/3.7.5/immutable.min.js"></script>

Map.values() returns an ES6 Iterable (as do Map.keys() and Map.entries()), and therefore you can convert to an array with Array.from() or the spread operator (as described in this answer).
e.g.:
Array.from(map.values())
or just
[...map.values()]

Convert Javascript string or array into JSON object

I have a JavaScript variable with comma separated string values - i.e. value1,value2,value3, ......,valueX,
I need to convert this variable's values into a JSON object. I will then use this object to match user enteredText value by using filterObj.hasOwnProperty(search)
Please help me to sort this out.

What you seem to want is to build, from your string, a JavaScript object that would act as a map so that you can efficiently test what values are inside.
You can do it like this :
var str = 'value1,value2,value3,valueX';
var map = {};
var tokens = str.split(',');
for (var i=tokens.length; i--;) map[tokens[i]]=true;
Then you can test if a value is present like this :
if (map[someWord]) {
// yes it's present
}

Why JSON? You can convert it into an array with split(",").
var csv = 'value1,value2,value3';
var array = csv.split(",");
console.log(array); // ["value1", "value2", "value3"]
Accessing it with array[i] should do the job.
for (var i = 0; i < array.length; i++) {
// do anything you want with array[i]
}
JSON is used for data interchanging. Unless you would like to communicate with other languages or pass some data along, there is no need for JSON when you are processing with JavaScript on a single page.

JavaScript has JSON.stringify() method to convert an object into JSON string and similarly JSON.parse() to convert it back. Read more about it
All about JSON : Why & How
Cheers!!

JSON format requires (single or multi-dimensional) list of key, value pairs. You cannot just convert a comma separated list in to JSON format. You need keys to assign.
Example,
[
{"key":"value1"},
{"key":"value2"},
{"key":"value3"},
...
{"key":"valueX"}
]
I think for your requirement, you can use Array.

append json objects into json array

I have a form and would like to append the contents of it to an existing array.
I am using JSON.stringify( $('#myForm').serializeObject() ) to convert my form elements into json objects.
The form has user info that i would like to append into myArr then append this list into an existing array.
myArr is populating fine, its just appending that into existingJsonArray i seem to be having problems with.
I saw this but since JSON.stringify creates the full json array would i need to knock out the [{ and }] ?
Is this the correct approach?
var existingJsonArray = [];
var myArr = [];
myArr.unshift( JSON.stringify( $('#myForm').serializeObject() ) );
existingJsonArray.unshift(myArr);

Please notice that JSON is the string representation of objects - and not suited well for manipulating them.
var array = [], // an Array literal in JavaScript code
formObject;
formObject = $('#myForm').serializeObject(); // an object representing the form
array.unshift([formObject]); // not sure why you need the nested array
// create string containing JSON representation of the array:
var jsonString = JSON.stringify(array);

How to convert JSON Array to Javascript Object Array

I have the following JSON value pushed from the server.
result=[{"id":1492,"name":"Delhi"},
{"id":109,"name":"Coimbatore"},
{"id":576,"name":"Konni"},
{"id":525,"name":"Kottayam"}
]
I know how to convert JSON Array to Javascript Array.Here is the code below(got from stackoverflow)
var locations = [];
$.each(result, function(i, obj) {
locations.push([obj.id,obj.name]);
});
I want to convert this JSON Array to a JavaScript Object Array so that I can access the values as jarray[0].id which will give me the value 1492. Please advice

You don't need to do anything to the result array. Just use result[0].id and it will evaluate to 1492.