Course of Raku / Functional, concurrent, reactive, and web programming / Functional programming / Data feeds / Exercises / A feed pipeline

Solution: A feed pipeline

Here is a possible solution to the task.

Code

(1..8)
    ==> grep(* > 3)
    ==> map(* * 2)
    ==> my @result;

say @result;

🦋 You can find the source code in the file feed-pipeline.raku.

Output

[8 10 12 14 16]

Comments

The first stage keeps the numbers greater than 3 (that is 4, 5, 6, 7, 8); the second doubles each one.
Each ==> passes its result to the next stage, and the last collects it into @result.

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