Count of objects in array Jquery?

Question

I have this array obejcts

  var customers =
[{"id":"1", "name":"John","position":"CEO","office":"NY", "active": "1"},
{"id":"2", "name":"Michael","position":"CEO","office":"NY", "active": "1"},
{"id":"3", "name":"Wanda","position":"CEO","office":"NY", "active": "0"},
{"id":"3", "name":"Novak","position":"CEO","office":"NY", "active": "0"}];

What i need is to get number of customers in that array,

 var indexID = 4;

And also a new array that will look like this

var newArray =
    [{"id", "name","position","office"}];

This new array will only collect title just once and with out active

score 4 · Accepted Answer · answered Sep 29 '14 at 06:04

4

First of all json is not valid. it should be:

var customers =
[{"id":"1", "name":"John","position":"CEO","office":"NY", "active": "1"},
{"id":"2", "name":"Michael","position":"CEO","office":"NY", "active": "1"},
{"id":"3", "name":"Wanda","position":"CEO","office":"NY", "active": "0"},
{"id":"3", "name":"Novak","position":"CEO","office":"NY", "active": "0"}];

you can get count using length this way:

var count = customers.length;

and you can create new array with desired properties only using map():

var newArray = customers.map(function(item,index){

    return { "id": item.id, "name": item.name,"position": item.position }

});

WORKING EXAMPLE:

http://jsfiddle.net/abu209tb/

answered Sep 29 '14 at 06:04

Ehsan Sajjad

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First part is ok, the problem is in the second, because it is hardcoded, what if the customers array changed, i need something to get only title – Miomir Dancevic Sep 29 '14 at 06:14
which title you want to get? – Ehsan Sajjad Sep 29 '14 at 06:20
I need all elements in new array but only last no – Miomir Dancevic Sep 29 '14 at 06:23
what you mean by last no? – Ehsan Sajjad Sep 29 '14 at 06:24
you can filter them @Gorostas – Ehsan Sajjad Sep 29 '14 at 06:37

score 1 · Answer 2 · edited May 23 '17 at 11:57

1

Im pretty sure .length is what you are looking for..

var indexID = customers.length;
var newArray = Object.keys(customers[0]);

thanks goes to this link for reference material: How do I enumerate the properties of a JavaScript object?

edited May 23 '17 at 11:57

Community

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answered Sep 29 '14 at 05:59

user230910

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you have enough reputation to leave this answer as a comment. – Kartikeya Khosla Sep 29 '14 at 06:00
what am i missing here? I'm answering the question? /me confused – user230910 Sep 29 '14 at 06:05
you edited the answer your intial answer was only a single line to use `.length` ... now its fine... – Kartikeya Khosla Sep 29 '14 at 06:07
ah ok, my very first stab at an answer was too simple for an "answer"... was just a placeholder while i gather my thoughts – user230910 Sep 29 '14 at 06:07

Count of objects in array Jquery?

2 Answers2

WORKING EXAMPLE: