Course of Raku / Advanced / Operators / Meta-operators

Zip metaoperators

The zip meta-operator Z takes two (or more) lists and pairs up their elements by position:

say (1, 2, 3) Z (4, 5, 6); # ((1 4) (2 5) (3 6))

The result is a list of groups: the first element of each list together, then the second of each, and so on.

More ingeniously, you can combine Z with an operator to act on each pair. For example, Z+ adds the elements position by position:

say (1, 2, 3) Z+ (10, 20, 30); # (11 22 33)

This is the zip meta-operator wrapping the + operator: it computes 1 + 10, 2 + 20, and 3 + 30. In the same way, Z* multiplies corresponding elements:

say (1, 2, 3) Z* (10, 20, 30); # (10 40 90)

And Z~ concatenates corresponding strings:

say <a b c> Z~ <1 2 3>; # (a1 b2 c3)

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