What is the difference between $message and $$message?
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| $message | $$message |
|---|---|
| $message is a regular variable. | $$message is a reference variable. |
| It has a fixed name and stores a fixed value. | It stores data about the variable. |
| Data stored in the $message is fixed. | The value of the $$message can change dynamically as the value of the variable changes. |
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