Undefined
- Means a variable exists but has no assigned value.
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Typeof
- typeof x tells you if x is a string, number, etc.
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Operator
- Operators add, compare, or combine data.
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else if Chain
- Lets you test several conditions in order.
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Local Scope
- Variables inside functions exist only there.
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Switch Statement
- Cleaner than else-if for checking many values.
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Function Declaration
- Use function greet() {} to create reusable code.
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Default Case
- Runs when no other case matches.
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