How does Swift let us compare many types of data? - a free Understanding Swift tutorial
www.hackingwithswift.com/quick-start/understanding-swift/how-does-swift-let-us-compare-many-types-of-data
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Swift implements this in a remarkably clever way that actually allows it to compare a wide variety of things.
For example, Swift has a special type for storing dates called Date, and you can compare dates using the same operators: someDate < someOtherDate, for example.
Swift lets us compare many kinds of values out of the box, which means we can check a variety of values for equality and comparison.
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