Why do you need to invoke an anonymous function on the same line?

Question

I was reading some posts about closures and saw this everywhere, but there is no clear explanation how it works - everytime I was just told to use it...:

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Answer 1

Another point of view

First, you can declare an anonymous function:

var foo = function(msg){
 alert(msg);
}

Then you call it:

foo ('Few');

Because foo = function(msg){alert(msg);} so you can replace foo as:

function(msg){
 alert(msg);
} ('Few');

But you should wrap your entire anonymous function inside pair of braces to avoid syntax error of declaring function when parsing. Then we have,

(function(msg){
 alert(msg);
}) ('Few');

By this way, It's easy understand for me.