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13 cards from this deck
Variables used to pass data into functions or procedures
Placeholder defined in function/procedure definition
Actual value passed when function is called
Arguments passed in same order as parameters defined
Parameters with default values if no argument provided
Arguments passed using parameter names, can be out of order
Copy of argument's value passed to function
Changes in function don't affect original argument
Reference to original argument passed to function
Changes in function affect original argument
Safer - original data not modified, avoids side effects
Efficient - no extra memory for copies
To modify original data or pass large data structures
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