Convert Array with objects to manipulate

Question

I'm trying to manipulate this array and play with parse, push and save data commands. but for some reason is not reading. Any help? I'm super new to it and just trying to practice. Should be an array of objects.

    var employeeString = [
    { first_name: 'Josh', last_name:'Neil', nationality:'Indian'},
    { first_name: 'Brian', last_name:'Cok', nationality:'Canadian'},
    { first_name: 'Katja', last_name:'Fanta', nationality:'German'} 
];
    var jsonValues = JSON.stringify(employeeString);
    current_values = JSON.parse(jsonValues);

    var nationality = [];
    //console.log (current_values);

    for ( i = 0; i < current_values.length; i++) {
        var currentItem = current_values[i]
        var first_name = currentItem['first_name'];
        var last_name = currentItem['last_name'];

        //push value into array
        nationality.push(currentItem['nationality']);
        if (currentItem == 'first_name' || currentItem == 'last_name') { 
            return id[i+1]; 
        }
    }

        console.log (first_name , last_name);

you need no parse, because you have allready an array.

Nina Scholz
– Nina Scholz

2018-09-30 14:59:39 +00:00
Commented Sep 30, 2018 at 14:59 — Nina Scholz
– Nina Scholz, Commented Sep 30, 2018 at 14:59
Im doing it already, have a look

paulo.gomes
– paulo.gomes

2018-09-30 15:02:56 +00:00
Commented Sep 30, 2018 at 15:02 — paulo.gomes
– paulo.gomes, Commented Sep 30, 2018 at 15:02
please add what you like to get (the final result).

Nina Scholz
– Nina Scholz

2018-09-30 15:04:00 +00:00
Commented Sep 30, 2018 at 15:04 — Nina Scholz
– Nina Scholz, Commented Sep 30, 2018 at 15:04

Roy Scheffers · Accepted Answer · 2018-09-30 20:46:26Z

1

You don't need to parse the already JSON object. For example JSON.parse('[{x:10},{y:20}]'); will return JSON object from the string. This step is required to access the value of x and y, which are in string form as you can see '' around it. But in your case, you already got a JSON Object you don't need to parse it again. Further in console.log if you want to print first_name, do not add '' around it. Here is your working code

var current_values = [
  { first_name: 'Josh', last_name: 'Neil', Nationality: 'Indian' },
  { first_name: 'Brian', last_name: 'Cok', Nationality: 'Canadian' },
  { first_name: 'Katja', last_name: 'Fanta', Nationality: 'German' }
];

//     current_values = JSON.parse(employeeString);

//     console.log(current_values);

for (i = 0; i < current_values.length; i++) {
  var currentItem = current_values[i]
  var first_name = currentItem['first_name'];
  var last_name = currentItem['last_name'];
  console.log(first_name, last_name);
}

edited Sep 30, 2018 at 20:46

Roy Scheffers

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answered Sep 30, 2018 at 15:09

mehta-rohan

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9 Comments

paulo.gomes Over a year ago

I got until this point now, but only prints the last name! if (currentItem == 'first_name') { // return obj[i+1];

mehta-rohan Over a year ago

currentItem contains the whole object { first_name: 'Josh', last_name: 'Neil', Nationality: 'Indian' }. what condition do you want to meet.

paulo.gomes Over a year ago

sum the names on key "first_name" and print all names. same for another keys.

mehta-rohan Over a year ago

sorry, I don't get "sum the names", you want to concatenate the names?

mehta-rohan Over a year ago

share the out put you want.

|

xtofl · Accepted Answer · 2018-09-30 14:58:51Z

0

The JSON.parse method accepts a string, but you're giving it an array of objects.

var values = JSON.parse("[{'first_name': 'Josh', ...}, ...]");

Would work better.

In general, parsing will convert a string to objects. http://www.willamette.edu/~fruehr/haskell/seuss.html

answered Sep 30, 2018 at 14:58

xtofl

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Comments

juanli · Accepted Answer · 2018-09-30 15:04:27Z

0

The data type for employeeString is Array, but JSON.parse() is supposed to parse JSON data. So, you can first change employeeString into a JSON data before parse it.

answered Sep 30, 2018 at 15:04

juanli

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3 Comments

paulo.gomes Over a year ago

var jsonValues = JSON.stringify(employeeString); current_values = JSON.parse(jsonValues); right?

juanli Over a year ago

@paulo.gomes Yes, this is one way to convert a non-JSON data to JSON data in JavaScript.

juanli Over a year ago

@paulo.gomes But you also realise that it doesn't do some useful thing. I mean if you have an array, just iterate it, no need to play with JSON. But if your original data is JSON (actually is string), then you just simply JSON.parse(yourData) and work with it.

Parzh · Accepted Answer · 2018-09-30 15:04:38Z

0

You don't need to JSON.parse(employeeString), since it is already an object.

JSON.parse is used to create objects from their string representation, e.g. parse the string '{"prop":42}' to an actual object with a property prop and its value being 42. Since employeeString in your code is already an object, you don't need to JSON.parse it again.

BTW, you probably meant this:

// notice that this is now an actual string
var employeeString = `[
    { first_name: 'Josh', last_name:'Neil', Nationality:'Indian'},
    { first_name: 'Brian', last_name:'Cok', Nationality:'Canadian'},
    { first_name: 'Katja', last_name:'Fanta', Nationality:'German'} 
]`;

edited Sep 30, 2018 at 15:04

answered Sep 30, 2018 at 14:59

Parzh

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2 Comments

paulo.gomes Over a year ago

I'm trying to save all datas by "key" and print it. still not working

Parzh Over a year ago

Also notice that everything after return statement is ignored.

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