Lazy lists (III)

• Most Perl 6 list processing functions both work with and produce lazy lists
• @a.map and @a.grep both produce lazy lists, even if @a is not lazy.
• @fib.grep(* %% 2) is a lazy list of all the even Fibonacci numbers, for instance
• @fib Z @a produces a lazy list that starts @fib[0], @a[0], @fib[1], @a[1] ...
• The for statement has no problem being passed an infinite list; it will loop forever unless stopped

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