Loops

Iterate with for over ranges, ^N, and pointy blocks; while, last, and next round it out.

for iterates over anything listy. A range like 1..5 counts inclusively; the pointy block -> $i names the current element:

for 1..3 -> $i {
    say "bottle $i";
}

bottle 1
bottle 2
bottle 3

Without a pointy block, the current element lands in the topic variable $_:

for <lint test ship> {
    say "step: $_";
}

step: lint
step: test
step: ship

^N — the first N numbers #

^5 is the range 0..4 — "up to but not including 5". You'll see it everywhere:

say "hello #$_" for ^3;

hello #0
hello #1
hello #2

That's the statement-modifier form of for, this time with nothing to set up.

while, last, next #

while loops on a condition; last breaks out of a loop and next skips to the next iteration:

my $n = 1;
while $n < 100 {
    $n *= 3;
}
say $n;

for 1..10 {
    next if $_ %% 2;
    last if $_ > 7;
    say $_;
}

243
1
3
5
7

Try it #

Print the multiplication table row for 7 — from 7 x 1 = 7 to 7 x 5 = 35.

for 1..5 -> $i {
}

for 1..5 -> $i {
    say "7 x $i = { 7 * $i }";
}

7 x 1 = 7
7 x 2 = 14
7 x 3 = 21
7 x 4 = 28
7 x 5 = 35