Documentation for method AT-POS assembled from the following types:

language documentation Subscripts

From Subscripts

(Subscripts) method AT-POS

multi method AT-POS (::?CLASS:D: $index)

Expected to return the element at position $index. This is what postcircumfix [ ] normally calls.

If you want an element to be mutable (like they are for the built-in Array type), you'll have to make sure to return it in the form of an item container that evaluates to the element's value when read, and updates it when assigned to. (Remember to use return-rw or the is rw routine trait to make that work; see the example.)

role Positional

From Positional

(Positional) method AT-POS

method AT-POS(\position)

Should return the value / container at the given position.

class Range

From Range

(Range) method AT-POS

Defined as

multi method AT-POS(Range:D: int \pos)
multi method AT-POS(Range:D: int:D \pos)

Checks if the Int position exists and in that case returns the element in that position.

say (1..4).AT-POS(2) # OUTPUT: «3␤»