What does this javascript code mean?

Question

var myval = (function(){})();

I do not understand the code (function..)and even the code yet.

Answer 1

You have:

self-running anonymous function

First, you create a function expression by positioning a paret around the function itself. Just write

function() {
}()

will not work on this instance because it will determine the function declaration.

So, after that we can call ourselves by adding()

(function() {
})();

To verify this, try the following:

var myval = (function(){return 'self executed!'})();

alert(myval); // === 'self executed'

Answer 2

• function(){} is an expression of a function, it defines a function
• (function(){}) - wrapping it in this way ensures that it will be treated as an expression
• (function(){})()- Addition ()calls function

.

, .

Answer 3

.

(function ($) {
  // Original JavaScript code.
})(jQuery);

$ , jQuery.

Answer 4

function(){} () . (()), . :

var f = function() {};
f();

?

(function(x, y, z){})(1, 2, 3)

Answer 5

:

• JavaScript?
• http://www.webreference.com/programming/javascript/rg36/
• http://www.bennadel.com/blog/1482-A-Graphical-Explanation-Of-Javascript-Closures-In-A-jQuery-Context.htm

Answer 6

:

(.. )

function(){}

, {}.

,

myval = function(){<something>};

myval (, !)

, myval(), , .

, () . :

var myval = (function(){})();

( ) myval