Variables

Variables are like labeled boxes where you can store information. You can put something in the box, change what’s inside, or look at what’s stored there.

• var: Old way, has some weird behaviors (avoid it)
• let: Modern way, can be changed, block-scoped
• const: Cannot be changed after creation, block-scoped

• Can contain letters, digits, underscore, and dollar sign
• Must start with a letter, underscore, or dollar sign
• Cannot use reserved words like let, const, function
• Are case sensitive

Tip: Use descriptive names! userAge is better than a.