javascript object creating

Question

I have a javascript object like this

 var student = function () {
     this.id = 1;
     this.Name = "Shohel";
     this.Roll = "04115407";
     this.Session = "03-04";
     this.Subject = "CSE";
 };

and i have a javascript array list like this

var students = [];

now i want to push student into students, this is shown below

students.push(new student())  //no prolem

students.push(new student[id = 3]) //Problem

here second line occurs exceptions, how can i push javascript object like as c# add list, which is representing second line? thanks

So what are you expecting when you try to call a function with brackets and not parenthesis ? — adeneo
– adeneo, Commented Jun 9, 2014 at 3:13
I want to set default value of student when i push into students — Shohel
– Shohel, Commented Jun 9, 2014 at 3:16
You have not provided for any way to pass values into your object class. — PeterKA
– PeterKA, Commented Jun 9, 2014 at 3:18
but i can do the same work in c# , without providing parameter, is it possible in javascript? — Shohel
– Shohel, Commented Jun 9, 2014 at 3:24
JavaScript is not C#. They are different languages and work differently. If you can something like this in C# then the answer is no, you can't do that in JavaScript. I really recommend to read a JavaScript tutorial if you intend to use this language: developer.mozilla.org/en-US/docs/Web/JavaScript/Guide . — Felix Kling
– Felix Kling, Commented Jun 9, 2014 at 3:30

Community · Accepted Answer · 2017-05-23 12:15:43Z

8

You simply can't, what you can do though is accept a config as a parameter to your constructor and read it like this

var student = function (config) {
                config = config || {};
                this.id = config.id || 1;
                this.Name = config.Name || "Shohel";
                this.Roll = config.Roll || "04115407";
                this.Session = config.Session || "03-04";
                this.Subject = config.Subject || "CSE";
            };

And call it like this

students.push(new student({id: 3}));

EDIT, PREFERRED ONE

Just as adeneo pointed out if you want to get rid of the repititive || for default values, you can use jQuery to pass them

var student = function (config) {
                    var defaults = {
                        id: 1,
                        Name: "Shohel",
                        Roll: "04115407",
                        Session: "03-04",
                        Subject: "CSE"
                    };
                    config = $.extend(defaults, config || {});
                    this.id = config.id;
                    this.Name = config.Name;
                    this.Roll = config.Roll;
                    this.Session = config.Session;
                    this.Subject = config.Subject;
                };

edited May 23, 2017 at 12:15

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answered Jun 9, 2014 at 3:16

a-d

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10 Comments

Reigel Gallarde Over a year ago

this answer I was waiting... ;) +1

adeneo Over a year ago

as a sidenote, you can remove most of those ugly OR's by just defining the object in config = config || {id:1, Name:'Shohel' ...}

a-d Over a year ago

I thought of that but if config is actually defined and all of the parameters are not defined you can get ugly values, i.e. undefined.

adeneo Over a year ago

If that's an issue, the question is tagged jQuery, so just do config = $.extend(config, defaults) etc. and you can remove all the ugly OR's

a-d Over a year ago

Okay can you be a bit more precise ? What error or behaviour do you get ?

|

Felix Kling · Accepted Answer · 2014-06-09 03:14:34Z

6

Make the values that are variable parameters of the function. For example:

var Student = function (id) {
  this.id = id;
  // ...
};

students.push(new Student(3));

I recommend to read a JavaScript tutorial about functions:

answered Jun 9, 2014 at 3:14

Felix Kling

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