is lazy

This page is an attempt to find the true meaning of is-lazy. Eventually, this page will be moved somewhere else.

• Rule of thumb №1: if you stick lazy in front of anything, .is-lazy will return True.
• Rule of thumb №2: sequences are not lazy unless the endpoint is +∞ or *.
• Rule of thumb №3: ranges are lazy if it starts with -∞ or *, or if it ends with +∞ or *.
• Rule of thumb №4: reverse ranges ((foo..bar).reverse) are lazy if it starts or ends with -∞, or if the original range started with *.

Code	.is-lazy
(1..9999999999999).is-lazy.say	False
(1..∞).is-lazy.say	True
(1...9999999999999).is-lazy.say	False
(1...∞).is-lazy.say	True
(-∞..42).is-lazy.say	True
(-∞...42).is-lazy.say	False
(-∞...∞).is-lazy.say	True
(-∞...∞).is-lazy.say	True
(0...∞).is-lazy.say	True
(0...-∞).is-lazy.say	False
my $s = gather for ^∞ { take $++ }; say $s.is-lazy	False
lines.is-lazy.say	False
().roll(*).is-lazy.say	False
(1).roll(*).is-lazy.say	True