๐Ÿ“˜ Variadic parameters in a sub in Perl 6

๐Ÿ“˜ Variadic parameters in a sub in Raku

N. B. Perl 6 has been renamed to Raku. Click to read more.

Pass a few scalars to a sub and work with them as with an array inside the sub.

The task is to take a few scalar parameters and pass them to a single array in the subroutine. 

Here is an example of how to do that, prefixing an array name with a star:

sub h($sep, *@data) {

h(', ', 'red', 'green', 'blue');

In Perl 6, theย *@data is called aย slurpy parameter. It is an array that consumes all of the arguments passed to the function after theย $sep argument. In the example above, three string values are passed. It is also possible to pass any other number of arguments:

h(', ', 'apple');

h(', ', 1, 2, 3, 4, 5);

Or even as a range of values, all of which land in the @data array.

h(', ', 'a' .. 'z');

It is important that in comparison to the solutions from Task 65,ย Passing arrays to subroutines, theย $sep argument is mentioned first in the sub signature. If you put it at the end, the compiler refuses to accept that and complains:

Cannot put required parameter $sep after variadic parameters

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