Foreach

say $_ for @collection;

Raku leaves off the each from foreach, leaving us with for instead. The variable $_ refers to the current element, unless you assign a name to it using ->.

for @collection -> $currentElement { say $currentElement; }

Raku will do it's best to put the topic at the right spot.

.say for @collection;
for @collection { .say };

Iteration can also be done with hyperoperators. In this case it's a candidate for autothreading and as such, execution order may vary. The resulting list will be in order.

@collection>>.say;
@collection>>.=&infix:<+>(2); # increment each element by 2