CODEWITHSUNDEEP
javascript
Liam Sperry
Liam Sperry

Reputation: 13

Variable that stores multiple data?

When i look at others code (because im curious how they do things) i common stumble across a specific var that catches my eye for example:

var data = {
  names = 0;
  charMove = 0;
  hunger = 100;
  thirst = 100;
}

I want to understand this for later when it could be useful in some of my code. I have a moderate understanding on javascript code and love to learn as much as i can so if you have anything please do tell!

Upvotes: 0

Views: 76

Answers (4)

Vidyadhar Mandke
Vidyadhar Mandke

Reputation: 588

You have to use

var player = {
  "level" : 1,
  "x" : 0,
  "y" : 0,
  "score" : 0,
}

The above is what it called Javascript object, a key-value representation...

Upvotes: 0

Jonathan L
Jonathan L

Reputation: 11

That is an object. There are multiple ways to create objects in JavaScript.

// An object.
    var someObject = new Object();


// An object literal (the preferred way of creating objects).
    var anotherObject = {};

They’re doing the exact same thing, but object literals are quicker to write. It’s also good to use white-space (tabs, and spaces) for neatness and readability.

Moreover, objects are merely collections of name/value pairs. In example:

var person = {
    firstname: 'John',
    lastname:  'Doe'
};

'Person' is the object, and it has some properties. 'firstname' and 'lastname' are the keys, while 'John' and 'Doe' are the values. Values can also be other collections of name/value pairs. For example:

var person = {
        firstname: 'John',
        lastname:  'Doe',
        address: {
          street: '111 Main St.',
          city: 'New York',
          state: 'NY'
        }
    };

A property of an object could be a primitive type (a boolean, string, number, etc.) or it could be another object — a child object so-to-speak. An object, along with its properties, can also contain methods which are nothing more than functions. However, we use the term 'method' when referring to a function that lives within an object.

Example of an object literal containing a method as one of its properties (which is just a function inside an object):

var person = {
    firstname: 'John',
    lastname:  'Doe'

    method: function(parameters) {
    // do something;
    }

};

Upvotes: 1

CascadeCoder
CascadeCoder

Reputation: 163

I dont use javascript but it looks like a type or struct. each member field can be accessed on its own.

The entire struct can be initialised at once such as

var player = {
  level = 1,
  x = 0,
  y = 0,
  score = 0
}

then the member felds can be modified individualy, such as

player.score = player.score + 100;

A struct make it much easier to pass multiple data into functions rather than having to pass separate variables.

Upvotes: -2

Michael Ritter
Michael Ritter

Reputation: 630

What you are probably talking about are Objects (although they are defined a little bit different).

They basically are just a Map or Dictionary that maps keys to values and are defined as follows:

var obj = {
  key: "value",
  key2: true,
  key3: function() {}
}

Where the right side can be pretty much everything including other objects.

values can be accessed (read and write) by using obj.key or obj["key"]

You can read up more about them here

Upvotes: 4

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