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