Is there any key/value pair structure in JavaScript?

Question

I want to store information like:

Pseudo-Code

array(manager) = {"Prateek","Rudresh","Prashant"};
array(employee) = {"namit","amit","sushil"};
array(hr) = {"priya","seema","nakul"};

What kind of data structure can I use?

Not sure I follow, why can't you use a javascript array like : var managers = ["Prateek","Rudresh","Prashant"]; ? — brendan
– brendan, Commented Jul 21, 2011 at 5:51

Pascal MARTIN · Accepted Answer · 2011-07-21 05:50:28Z

39

You can use arrays to store list of data ; and objects for key-value

In you case, you'd probably use both :

var data = {
    'manager': ["Prateek","Rudresh","Prashant"], 
    'employee': ["namit","amit","sushil"], 
    'hr': ["priya","seema","nakul"]
};

Here, data is an object ; which contains three arrays.

answered Jul 21, 2011 at 5:50

Pascal MARTIN

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Comments

Lucky · Accepted Answer · 2016-06-23 14:07:37Z

13

An object:

var myobj = {
  "manager": ["Prateek","Rudresh","Prashant"],
  "employee": ["namit","amit","sushil"],
  "hr": ["priya","seema","nakul"]
}

alert(myobj['employee'][1]); // Outputs "amit"

edited Jun 23, 2016 at 14:07

Lucky

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answered Jul 21, 2011 at 5:50

Paul

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3 Comments

sushil bharwani Over a year ago

Yes i think i was looking for it.

jfriend00 Over a year ago

Did you mean for {"Prateek","Rudresh","Prashant"} to be an array?

Paul Over a year ago

@jfriend00 Yes, I think he is wanting to use them as arrays.

Shurdoof · Accepted Answer · 2011-07-21 05:53:20Z

10

A normal object will do:

var a = {
    key1: "value1",
    key2: ["value2.1","value2.2"]
    /*etc*/
}

Access with:

a.key1
a["key1"]

answered Jul 21, 2011 at 5:53

Shurdoof

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Comments

Vlad Bezden · Accepted Answer · 2017-03-17 15:16:51Z

8

With ES2015/ES6 you have Map type.

Using Map your code will look like

const map = new Map([
  ['manager', ['Prateek', 'Rudresh', 'Prashant']],
  ['employee', ['namit', 'amit', 'sushil']],
  ['hr', ['priya', 'seema', 'nakul']]
])

console.log(...map.entries())

To get Individual value you can use Map.get('key') method

answered Mar 17, 2017 at 15:16

Vlad Bezden

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Comments

dangerdave · Accepted Answer · 2011-07-21 06:01:46Z

7

you could store them in an array of objects:

    var Staff = [
       { name: 'Prateek', role: manager },
       { name: 'Rudresh', role: manager },
       { name: 'Prashant', role: manager },
       { name: 'Namit', role: employee },
       { name: 'Amit', role: employee },
       { name: 'Sushil', role: employee },
       { name: 'Priya', role: hr },
       { name: 'Seema', role: hr },
       { name: 'Nakul', role: hr },
    ];

adding an ID attribute might be useful too depending on your application. i.e

    { id: 223, name: 'Prateek', role: manager },

answered Jul 21, 2011 at 6:01

dangerdave

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Comments

Bakudan · Accepted Answer · 2011-07-21 05:57:06Z

2

Or use JSON like this. A little change of your pseudo code, but it will be serchable and extendable.

var Person = [
{
    "name": "Prateek",
    "position": "manager"},
{
    "name": "James",
    "position": "employee"}

];

answered Jul 21, 2011 at 5:57

Bakudan

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Comments

Ibu · Accepted Answer · 2013-03-26 22:13:50Z

1

Yes there is:

var theArray = {};
theArray["manager"] = ["Prateek","Rudresh","Prashant"];
theArray["employee"] = ["namit","amit","sushil"];
theArray["hr"] = ["priya","seema","nakul"];

edited Mar 26, 2013 at 22:13

answered Jul 21, 2011 at 5:50

Ibu

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5 Comments

Emil Ivanov Over a year ago

This is not correct, any object is that structure. Your example works because an array is just an object.

Ibu Over a year ago

@Emil Ivanov: This is perfectly correct, it create a 2 dimensional array. please elaborate which part is incorrect

Emil Ivanov Over a year ago

Arrays in Javascript can only be indexed by a number. Indexing them by string is possible, because any object in js can be indexed by a string.

Ibu Over a year ago

i am very confused, so which part of my answer is wrong again?

mike Over a year ago

@lbu - Run "JSON.stringify(theArray);" you will see that it returns an object containing 3 properties, which are arrays. I think Emil's complaint is that naming an object "theArray" is misleading, it is helpful to understand theArray correctly as an object, not an array. Yes your code works, but "2 dimensional array" concept is incorrect.

Jatin Dhoot · Accepted Answer · 2011-07-21 05:53:08Z

-1

Even you can use stuff as below :-

var obj = new Object();

obj.name = 'Jatin';
obj.place = 'Delhi';

answered Jul 21, 2011 at 5:53

Jatin Dhoot

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