From the course: Learning Higher-Order Functions with Swift

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Reduce

Reduce

From the course: Learning Higher-Order Functions with Swift

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Reduce

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- The next higher order function we want to talk about is Reduce. Now, for some reason, a lot of people seem to have a problem getting the concept of Reduce. I know I did. Just like Map, you want to call it Convert. It converts, it converts. That's not necessarily, it's a little bit broader than that. You can do a lot more with it. Reduce is the same way. It takes a collection and produces one value, and that's it. Don't overthink it again. It's taking a bunch of things and coming out with one. That might mean it sums them together, might mean it concatenates them, it might mean it merges them together some other way, or takes them apart somehow. But the idea is, you take a bunch of things, and you come up with one value. So, you could call it boiling down. You could call it combining. You could call it reducing, and that's what it's called, Reduce. It takes a collection, produces one value. It has an initial starting value that's called the initial result, and then, each time your…

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