Reading some Objective-C manuals about properties and instance variables, I came across a lot of sentences like
a
readwriteproperty will be backed by an instance variable.
or
Properties are typically backed by an instance variable with a leading underscore, so creating a property called
firstNamewould have a backing instance variable with the name_firstName
What is a "backing" variable? Why does the text use the word "back"? What does it mean exactly?
