Exploring Scopes And namespaces in JavaScript

scopesAndReferences.js

var foo = 12;

function changeFoo() {
  foo = 34; // changes global scope and not local scope!
}

changeFoo();

console.log(foo);

// This becomes a more apparent issue in next example

// Out here is the global scope

for(var i = 0; i < 10; i++) {
    innerLoop();
}

function innerLoop() {
    // this is a different scope
    for(i = 0; i < 10; i++) { // missing var statement! i refers to global scope!
       	console.log("this is will show 10 times and not 100.");
    }
}