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Okay, let's dive deep into detecting arrow key presses in JavaScript, covering various aspects and providing a robust and practical tutorial.

*Understanding the Core Concepts*

Before we get into the code, let's understand the foundation:

1. *Keyboard Events:* JavaScript provides keyboard events that are triggered when the user interacts with the keyboard. The three main keyboard events are:
`keydown`: Fired when a key is pressed down.
`keyup`: Fired when a key is released.
`keypress`: (Largely deprecated, inconsistent across browsers, and best avoided). Historically, `keypress` was used for capturing character input, but it had issues with handling special keys and non-printing keys.

2. *Event Listener:* To detect these events, you attach an event listener to a specific element or, more commonly, to the entire `document` object. The event listener tells the browser to execute a specific function (called an *event handler*) when the event occurs.

3. *Event Object:* When an event occurs, the browser creates an event object containing information about the event, such as which key was pressed. We'll access this event object within our event handler function.

4. *`event.key` and `event.code`:* These properties of the event object are crucial for detecting arrow keys:
`event.key`: Returns a string representing the key that was pressed. For arrow keys, it will return values like `"ArrowUp"`, `"ArrowDown"`, `"ArrowLeft"`, `"ArrowRight"`. It is generally recommended to use `event.key` when possible for simplicity.

`event.code`: Returns a string representing the physical key on the keyboard that was pressed, regardless of the current keyboard layout or language. For arrow keys, it will return values like `"ArrowUp"`, `"ArrowDown"`, `"ArrowLeft"`, `"ArrowRight"`. This is beneficial as it is invariant to the keyboard layout and provides consistency.

5. *`event.keyCode` (Deprecated):* This property, while still availa ...

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