Why is our URLSession object a variable and not a constant
I'm following a tutorial on consuming REST API's to get JSON back from a third party server. We are building out a networkProcessor class in which we will be able to use it by creating instances of this class in ViewControllers in order to make url sessions for network calls. I noticed that the author declared the session placeholder as a variable and not a constant which went against what I've learned while using Xcode which is to always consider using constants first. Is there a specific reason why the author may have chosen to make this a variable and not a constant?
Here is what I have so far:
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