In this lesson, you’ll explore transforming operators. These operators let you manipulate and reshape the data
flowing through your streams. You’ll cover the following operators:
map: This operator transforms each item into a flow. It’s similar to the map function in other collections,
letting you apply a function to each element to create a new flow.
flatMapLatest: This operator allows you to create a new flow from each item in an existing flow. It’s useful when
you need to work with asynchronous tasks or nested data structures.
transform: This operator allows you to perform various operations like emitting multiple values, skipping emissions,
or applying more complex logic on each item in the flow.
The map Operator
Suppose you’re processing a stream of carrots in your factory, and you need to convert them into carrot juice. You
could use the map operator to transform each carrot into a juice object:
fun carrotJuice(): Flow<CarrotJuice> = carrots.asFlow()
.map { carrot -> carrotJuicer.toJuice(carrot) }
.collect { juice -> println("Produced: $juice") }
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The flatMapLatest Operator
Next, suppose you have a collection of carrot batches, and each batch has some number of carrots. You process each
carrot from the batch, but if a new batch arrives, you switch to that one:
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Wrap-Up
In this lesson, you’ve explored key transforming operators in Kotlin Flow, including map, flatMapLatest, and
transform. You’ve seen how these operators can be used to manipulate and transform data as it flows through your
reactive streams.
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This content was released on Jun 5 2024. The official support period is 6-months
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