solution to create structure object in javascript

Question

Javascript do not have structures.

So can i create a GLOBAL object like struct abc in javascript .

Struct abc contains some variables & array of another structure struct xyz.

struct xyz {

  var age;
  var name;

};

struct abc {

  var start;
  var end;
  var length;

  struct xyz  xyz_array[100];


};

If structures is not possible in javascript how can i save data in this format ?

============================= Edit some solution i found =================

http://www.w3schools.com/js/js_object_definition.asp
Javascript: How to create an array of object literals in a loop

=============================================

var details = {
    Start: 0,
    End: 0,
    length: 0
};



var arr = [];
var len = 100;

for (var i = 0; i < len; i++) {
    arr.push({
        direction: "out",
        message  : ""
    });
}

=====================================

Array inside a Javascript Object?

var details = {
    Start: 0,
    End: 0,
    length: 0
    info_text : []
};



var len = 100;

for (var i = 0; i < len; i++) {
    details.info_text.push({
        direction: "out",
        message  : ""
    });
}

=========================================

What is the "this" that you wish to achieve? In JS, the executing engine handles memory management -- you do not, generally, have access to low level concepts like this. But if you merely want to group a set of values, you just use an object. — Semicolon, Oct 31 '14 at 07:18
why do you think you need a struct. a simple object is suffice. — Prabhu Murthy, Oct 31 '14 at 07:19

ArtOfCode · Answer 1 · 2014-10-31T08:16:33.563

3

TLDR: No. Use objects instead.

JavaScript does not have a struct concept in the language. You can instead use objects:

var xyz = {
    something: "hello world"
}

edited Oct 31 '14 at 08:16

answered Oct 31 '14 at 07:13

ArtOfCode

5,702
5
37
56

I think you meant to write `var xyz = { something: 'hello world' };` – Semicolon Oct 31 '14 at 07:16

score 3 · Answer 2 · answered Oct 31 '14 at 07:18

The closest equivalent in Javascript is an 'object'. There are two ways you can create and use them, demonstrated below.

Simple example, using an object literal

var xyz = {
    age: 42,
    name: 'fred'
};

More complex example, using a Javascript 'class' (really function)

function xyz(age, name) {
    this.age = age;
    this.name = name;
    this.getAge = function() { return age; }
}

var myXyz = new xyz(42, 'fred');
myXyz.getAge(); // Returns 42

Your second example essentially explains all of Javascript :) thanks! :) — Fattie, Feb 06 '21 at 15:41

Subhranshu · Accepted Answer · 2014-10-31T09:10:49.760

2

Javascript is an object-based dynamic language that doesn't use the struct concept from C.

For your requirement you can use -

/* definition of an Object */
var xyz = function(age,name){
          this.age =  age;
          this.name = name;
    return this;
};

/* composition */
var abc = {
          start:'',
          end:'',
          length:'',
          xyz_pseudo_array: []
};

//push data inside the **xyz_pseudo_array** as and when needed, without having to worry about size-
abc.xyz_pseudo_array.push(new xyz(25,"Bill Gates"));

edited Oct 31 '14 at 09:10

answered Oct 31 '14 at 07:30

Subhranshu

435
2
12

was meditating inside a cave, just came back. BTW why is this downvoted? – Subhranshu Feb 03 '18 at 20:37

score 0 · Answer 4 · answered Oct 31 '14 at 07:19

In JavaScript you can use function(){ ... }, in which can act more similar to a class in other languages, in which can do the same thing a struct can do but more powerful.

function xyz() {
   this.age = ...;
   this.name = ...;
}

You can also just use var for an object:

var xyz = { age: ... , name: ... };

score 0 · Answer 5 · answered Oct 31 '14 at 08:05

Cited from JavaScript: The Good Parts

The simple types of JavaScript are numbers, strings, booleans (trueandfalse),null, and undefined. All other values are objects. Numbers, strings, and booleans are object-like in that they have methods, but they are immutable. Objects in JavaScript are mutable keyed collections. In JavaScript, arrays are objects, functions are objects, regular expressions are objects, and, of course, objects are objects.

So you can use object, example :

function xyz(age, name){
    this.age = age;
    this.name = name;
}

var abc = {
    start : null,
    end : null,
    length: null

    xyz_array: []
}

abc.xyz_array.push( new xyz(33, 'johnDoe') );
abc.xyz_array.push( new xyz(32, 'jeanDoe') );

console.log(abc);

solution to create structure object in javascript

5 Answers5