Loan Pattern as the name suggests would loan a resource to your function. So if you break out the sentence. It would
- Create a resource which you can use
- Loan the resources to the function which would use it
- This function would be passed by the caller
- The resource would be destroyed
As you would see, the advantages are multifold.
- First, I am not constrained by the function which can use the loaned resource. I can pass any function that I desire.
- Second, I am not concerned about the creation, destruction of the resource. The loan function takes care of it.
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In this example, the using loan a resource to a function and close the resource after the function finished using it.
Scala offers a functionality known as Structural Types which allows to set a behaviour very similar to what dynamic languages allow to do when they support Duck Typing.