Course of Raku / Functional, concurrent, reactive, and web programming / Reactive programming / await / Exercises / Await a promise

Solution: Await a promise

Here is a possible solution to the task.

Code

my @jobs =
    (start { sleep 0.3; 'slow'   }),
    (start { sleep 0.1; 'quick'  }),
    (start { sleep 0.2; 'medium' });

say await @jobs;

🦋 You can find the source code in the file await-a-promise.raku.

Output

(slow quick medium)

Comments

All three jobs start at once and sleep concurrently, so the whole program takes about 0.3 seconds — the duration of the slowest job, not the sum of all three.
Although quick finishes first and slow last, the output is (slow quick medium): await returns each result at the same position as its promise in @jobs. Completion order affects only when await returns, never the arrangement of the results.

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