CODEWITHSUNDEEP
javascript
Aljoša Srebotnjak
Aljoša Srebotnjak

Reputation: 1331

javascript function object method

Hey im new to javascript and i stumbled upon this code in javascript. I dont understand how can be methods increment and print defined inside function. Does that mean that create is an object?

 function create() {
     var counter = 0;
     return {
         increment: function () {
             counter++;
         },
         print: function () {
             console.log(counter);
         }
     }
 }
 var c = create();
 c.increment();
 c.print(); // 1

Upvotes: 2

Views: 670

Answers (2)

Pointy
Pointy

Reputation: 413702

The function "create()" returns an object. The object it returns has two properties, "increment" and "decrement", both of which have functions as values. The functions operate on the variable "counter" defined in "create()".

Each call to "create()" instantiates a new context called a "closure". The context encloses a new copy of the "counter" variable. The objects returned from calls to "create()" thus have access to their own private "counter" instance.

Upvotes: 1

Krizz
Krizz

Reputation: 11542

The keyword for you is closure.

Closures in javascript are quite covered, e.g. in How do JavaScript closures work?.

Upvotes: 0

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