Why do variables in the global scope get assigned to the window object?

Question

var foo = \'bar\';
console.log(window.foo); // bar

Seems like variables get assigned as properties to this, but inside anonymous funct

Answer 1

Inside self-invoking anonymous function eg:

function() {
    ....
}()

All variables remain inside it and do not attach themselves to global object or window. Using that technique, there are patterns created such as module/singleton pattern.

Notice that in JS, variables have function-level scope.