Course of Raku / Functional, concurrent, reactive, and web programming / Concurrent programming / Channels / Exercises

Sum a channel

Problem

Create a channel and drive it with two promises. In one start block — the producer — send the numbers 1..6 into the channel and then close it. In a second start block — the consumer — collect every value with .list and return their sum. Await both promises together, and print the sum the consumer produced. This is the natural shape of a channel: a producer on one thread, a consumer on another, coordinated from a third.

Example

The program prints:

21

Solution

✅ See the solution

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