How to call a self executing function in JavaScript?

Question

When I have some code I need to execute more than once I wrap it up in a function so I don\'t have to repeat myself. Sometimes in addition there\'s a need to execute this co

Answer 1

The second function foo is a function definition expression.

In a function definition expression, you can only call the function with the name within the function itself according to "Javascript the definitive guide":

For function definition expressions, the name is optional: if present, the name refers to the function object only within the body of the function itself.

It can be used in a recursion function definition expression.

For example:

var f = function factorial(n) {
    if (n == 0 || n == 1)
        return 1;
    else
        return n * factorial(n-1);
}