Question

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What is the purpose of a self executing function in javascript?
What does this mean? (function (x,y)){…}){a,b); in JavaScript

I see sometimes functions defined like these examples :

(function() {
    ....     
})();

(function(param) {
    ....     
})(JQuery);

(function(chat, Friend) {
    ....     
})(chat, chat.module("friend");

After some web researches, I didn’t find any information about the meaning of the last parentheses information.

Is there someone to explain how to use it? Or simply point a web link explaining the meaning?

Answer 1

meaning of the last brakets

(function() {
    ....     
})();

The () in the end causes the code inside the function to be executed immediately.

(function(param) {
    ....     
})(JQuery);

The (JQuery) in the end causes the code inside the function to be executed immediately, passing JQuery as a parameter to it.

(function(chat, Friend) {
    ....     
})(chat, chat.module("friend"));

The (chat, chat.module("friend")) in the end causes the code inside the function to be executed immediately, passing chat and chat.module("friend") as parameters to it.