JavaScript_Succinctly

Self-invoking anonymous function statements
It’s possible to create an anonymous function statement that is self-invoked. This is
called a self-invoking anonymous function. In the following sample, we create several
anonymous functions that are immediately invoked.
Sample: sample93.html
// Most commonly used/seen in the wild.
(function (msg) {
console.log(msg);
})('Hi');
// Slightly different, but achieving the same thing:
(function (msg) {
console.log(msg)
} ('Hi'));
// The shortest possible solution.
!function sayHi(msg) { console.log(msg); } ('Hi');
// FYI, this does NOT work!
// function sayHi() {console.log('hi');}();
Notes
According to the ECMAScript standard, the parentheses around the function (or
anything that transforms the function into an expression) are required if the function is to
be invoked immediately.
Functions can be nested
Functions can be nested inside of other functions indefinitely. In the following code
sample, we encapsulate the goo function inside of the bar function, which is inside of
the foo function.
Sample: sample94.html
var foo = function () {
100