How do we call this style?

[Ryan Chan]

How do we call this style?

(function() {

// CODES...

}) ();

 

[Dmitry A. Soshnikov]

How do we call this style?

(function() {

// CODES...

}) ();

Anonymous function expression which executes right after creation.
Usually is used for encapsulate helper-data from the outer context
(e.g. initialization of some objects which returns simple interface to
the outside, but uses some auxiliary stuff inside this function).

In this exact case it should be surrounded with the brackets (grouping
operator) which depends on syntactic rules. But in some other cases
surrounding with brackets for function expressions is not required.

/ds