Develop Reference

return array variable from csv - javascript / Node

So I'm running this code from a node console and I need to put the result as a variable
var csv = require('csv-array');
csv.parseCSV("my.csv"
, function(data){
console.log(JSON.stringify(data));
});
The array prints out fine, but how do I set the result as a variable? (I'm hoping this is as easy as it seems for someone with experience)

Here you go,
var csv = require('csv-array');
//variable declaration
var myVariable;
csv.parseCSV("my.csv", function(data){
myVariable = JSON.stringify(data);
return data;
});
//take it as a variable here.
console.log(myVariable);

Load a JSON file into a JS object

I try to load a json file into a JavaScript var but it just doesn't work out.
var jsonString = JSON.stringify('./test.json');
var obj = JSON.parse(jsonString);
console.log(obj.details.ProductID);
it says that it can't read property ProductID of undefined.
What am I doing wrong here ?

You need to make an AJAX call to get the file. $.getJSON was intended for exactly this purpose:
$.getJSON('./test.json', function(obj) {
console.log(obj.details.ProductID);
});

If you are using jQuery:
$.getJSON( "/test.json", function( obj ) {
console.log(obj.details.ProductID);
});

JSON.stringify() first argument needs to be a valid JSON string, not a file.
You need to use AJAX to retrieve file from server:
$.getJSON('./test.json', function(responseObject){
var obj = responseObject
console.log(obj)
})

In case it helps anyone, just use this:
const dataObjectFromFile = require('./path/to/datafile.json');

JSON array-like object, add item

I have a JSON file which contains:
[{"id":1,"first_name":"Judith","email":"jshaw0#wikipedia.org"},
{"id":2,"first_name":"Sarah","email":"sross1#infoseek.co.jp"},
{"id":3,"first_name":"Dorothy","email":"dgreene2#posterous.com"},
{"id":4,"first_name":"Christine","email":"cnichols3#techcrunch.com"},
{"id":5,"first_name":"Theresa","email":"trogers4#xrea.com"},
{"id":6,"first_name":"Rebecca","email":"rpeterson5#mlb.com"},
{"id":7,"first_name":"Chris","email":"cbailey6#yellowpages.com"},
{"id":8,"first_name":"Howard","email":"hbailey7#miibeian.gov.cn"},
{"id":9,"first_name":"Sara","email":"ssimpson8#techcrunch.com"},
{"id":10,"first_name":"Lois","email":"lmartinez9#dion.ne.jp"},
{"id":11,"first_name":"Jeffrey","email":"jhalla#intel.com"},
{"id":12,"first_name":"Teresa","email":"tcampbellb#usnews.com"},
{"id":13,"first_name":"Susan","email":"skingc#wired.com"},
{"id":14,"first_name":"Richard","email":"rpattersond#omniture.com"},
{"id":15,"first_name":"Ronald","email":"rgreenee#wordpress.org"}]
I want to add one more element to it but I can't figure it out how.
I have the following node code:
var jsonfile = require('jsonfile');
var util = require('util');
var file = 'data.json';
var jsonObj = {};
jsonfile.readFile(file, function(err, obj) {
jsonObj = obj;
new_obj = {"id":16,"first_name":"Florin","email":"popflorin1705#yahoo.com"};
//jsonObj.push(new_obj)
console.log(typeof jsonObj);
/*jsonfile.writeFile(file, jsonObj, function (err) {
console.error(err)
})*/
});
I've tried to use push method, but obviously is not working because it is an object not an array, even if it looks as an array. Which would be a good way to add another row at the end of the object (or array - I'm confused)?

I believe you're forgetting to parse JSON. After reading the file, your code should be:
jsonObj = JSON.parse(obj);
instead of straight assignment.

Declare the variable
var new_obj = {"id":16,"first_name":"Florin","email":"popflorin1705#yahoo.com"};
And then use push() as you have done already. Give it a try. It will work only if obj is json object as you mentioned in question.

getting json data from tree and feeding through to associative array

I'm trying to read a JSON API and parse the data into an associative array but I can't seem to get it to work. I must be doing something wrong.
Here is my code:
var matchedValues = {};
$.getJSON(url ,function(data) {
$.each(data, function() {
var value = this["value"];
var climb = this["climb"];
matchedValues[value] = climb;
});
});
console.log(matchedValues); //Outputs Object{}
Any ideas? I don't think I am console logging it correctly or maybe I'm doing something wrong?
Thanks

matchedValues is an Object not an array. try something likmatchedValues['your_key'] to get the value.

I assume that the data coming back from the ajax call is a JSON string, which you wish to parse. If that’s the case, then the problem is already solved using JavaScript’s JSON object:
var matchedValues = {};
$.getJSON(url ,function(data) {
matchedValues=JSON.parse(data);
});
console.log(JSON.stringfy(matchedValues)); //Outputs Object{}
As you see in the above example, you have to reverse the process in order to print it out.
See JSON MDN Article

Try this approach from jquery documentation
EDIT:
$.getJSON(url, function(data) {
var matchedValues = {};
$.each(data, function(key, val) {
items[key] = val;
});

If I understood your question, then your data is an Array of objects, and you want to consolidate them in a big object.
If got it right, then use this approach:
var matchedValues = {};
$.getJSON("ajax/test.json", function(data) {
for (var i = 0; i < data.length; i++) {
for (key in data[i]) {
matchedValues[key] = data[i][key];
}
}
console.log(matchedValues); //this should print your object.
});
The data objects must have different keys or they will be overlapsed.

Use non-static variable with chrome.storage.local.set / get

Is it possible to use a non static variable with chrome.storage.local.get. Right now, I can not recover anything.
here's what I do:
myVar = 'test';
var obj = {};
obj[myVar] = Output;
storage.set(obj);
and to recover, I do:
var key = example + 'js';
storage.get(key, function (result) {
console.log (result.key)
});
Thank you in advance for your help!

You can pass null as the query to retrieve the whole storage:
chrome.storage.local.get(null, function(data) {
// data contains everything in storage
});