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#2023.05 | |
role DataSlice does Iterable { # <-- Iterable role needed for container, but not Positional | |
#role DataSlice does Positional does Iterable { | |
has Any @.data; | |
#`[ # <-- the actual Iterable (and Positional) methods are not important | |
# Positional role support | |
# viz. https://docs.raku.org/type/Positional | |
method of { | |
Any | |
} | |
method elems { | |
@!data.elems | |
} | |
method AT-POS( $p ) { | |
@!data[$p] | |
} | |
method EXISTS-POS( $p ) { | |
0 <= $p < @!data.elems ?? True !! False | |
} | |
# Iterable role support | |
# viz. https://docs.raku.org/type/Iterable | |
method iterator { | |
@!data.iterator | |
} | |
method flat { | |
@!data.flat | |
} | |
method lazy { | |
@!data.lazy | |
} | |
method hyper { | |
@!data.hyper | |
} | |
#] | |
# Extra support for reduce via list and Numeric | |
method Numeric { | |
@!data.Numeric | |
} | |
method list { | |
@!data.list | |
} | |
} | |
#`[ fails | |
my \dss = $; # <-- thou shalt not use a scalar container | |
dss = DataSlice.new( data => [1, 3, 5, 42, 6, 8] ); | |
#] | |
#[ works | |
my \dss = DataSlice.new( data => [1, 3, 5, 42, 6, 8] ); | |
#] | |
say [+] dss.data; #65 | |
say [+] dss; #65 | |
say dss.data.VAR.^name; | |
say dss.VAR.^name; |
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