Re^5: [Raku] Assigning defaults to attributes that are fixed length lists (and other confusions)


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Re^5: [Raku] Assigning defaults to attributes that are fixed length lists (and other confusions)

by jcb (Parson)

on May 05, 2021 at 21:33 UTC ( [id://11132112]=note: print w/replies, xml )

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in reply to Re^4: [Raku] Assigning defaults to attributes that are fixed length lists (and other confusions)
in thread [Raku] Assigning defaults to attributes that are fixed length lists (and other confusions)

An empty Array is falsey, yet an empty shaped Array is truthy

I will hazard a guess that Raku handles arrays in scalar context similarly to Perl 5: an array evaluated in scalar context produces the number of elements in the array. An empty array has zero elements, but a shaped array has a fixed number of elements. In boolean context, zero is false and any non-zero number is true.

Thus, an empty array (with zero elements) is a false value, but an array with a fixed non-zero number of elements is a true value.