Did you know var adds to the window object javascript coding

did you know `var` adds to the `window` object in javascript? a deep dive

**understanding scope: the foundation**

before we dive into the `window` object connection, it's crucial to understand the concept of scope in javascript. scope determines the accessibility and visibility of variables within your code. javascript primarily uses two types of scope:

* **global scope:** variables declared outside any function or block have global scope. they can be accessed and modified from anywhere in your script.
* **function scope (with `var`):** variables declared inside a function using `var` are scoped to that function. they are only accessible within the function itself. variables declared without `var` inside a function, in sloppy mode, can leak into the global scope.
* **block scope (with `let` and `const`):** introduced in es6 (ecmascript 2015), `let` and `const` declare variables that are scoped to the block they are defined in (e.g., inside an `if` statement, `for` loop, or any code enclosed in curly braces `{}`).

**the `window` object: global scope in browsers**

in web browsers, the `window` object represents the browser window itself. it's the top-level object in the browser's javascript environment and acts as the global scope container. anything declared in the global scope becomes a property of the `window` object.

**`var` and the `window` object: the connection**

the core point of this tutorial is that when you declare a variable using the `var` keyword *in the global scope*, it essentially becomes a property of the `window` object.

**example 1: simple global `var` declaration**

**explanation:**

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