Swift Object ModelLesson 36Free preview

Equatable & Comparable

This lesson is part of Swift · All levels

Summary

This lesson discusses the standard protocols Equatable and Comparable in Swift. Adopting Equatable allows your custom type to compare its similarity values using the operators '==' and '!='. Comparable adds the ability to compare sequences using the operators '<', '>', '<=', and '>='.

Key points

The 'Equatable' protocol allows comparison of values using the '==' operator
The Swift compiler can automatically generate the syntax '==' for struct if all of its stored properties are already Equatable
The 'Comparable' protocol inherits Equatable and adds the sequence operator '<'
Adopting Comparable automatically allows the sequencing of an array of objects by the '.sort()' method

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