April 2017
Intermediate to advanced
316 pages
9h 33m
English
Content preview from Swift Functional Programming - Second Edition
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Interchangeability
As a value type is copied when it is assigned to a new variable, all of those copies are completely interchangeable.
We can safely store a value that is passed to us, and then later utilize this value as if it were a new value. It will not be possible to compare the instance with another instance using anything but its data.
Interchangeability also means that it does not matter how a given value was defined. Two value types are equal by all means if comparing them via == results in equality.
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