How is the memory allocation done for variables in scripting languages?

Python uses a technique called reference counting which basically puts a counter in the value. Each time a reference to a value is created, the counter is incremented. When a reference to the value is lost (for instance when you assign a new value to 'x'), the value is decremented.

When the counter reaches zero, that means that no reference to the value exists, and it can be deallocated. This is a simplified explanation, but that's at least the basics.

Maybe this link gives more insight, at least on the part of javascript.

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