Course of Raku / Functional, concurrent, reactive, and web programming / Reactive programming / Supplies / Transforming a supply
Quiz — Transforming a supply
What does the following program print?
my @out;
Supply.from-list(1, 2, 3).map(* ** 2).tap(-> $v { @out.push($v) });
say @out;| 0 | [1 2 3] |
| 1 | [1 4 9] |
| 0 | [2 4 6] |
| 0 | 14 |
map(* ** 2) produces a new supply that squares each
value. The tap collects 1, 4, 9 into @out.