Combined from primary sources listed below.
See primary docmentation in context for sub isa.
multi isa-ok(Mu $var, Mu $type, $desc = "The object is-a '$type.raku()'")
Marks a test as passed if the given object $var is, or inherits from, the given $type. For convenience, types may also be specified as a string. The function accepts an optional description of the test, which defaults to a string that describes the object.
class Womble {}
class GreatUncleBulgaria is Womble {}
my $womble = GreatUncleBulgaria.new;
isa-ok $womble, Womble, "Great Uncle Bulgaria is a womble";
isa-ok $womble, 'Womble'; # equivalent
Note that, unlike isa, isa-ok also matches Roles:
say 42.isa(Numeric); # OUTPUT: «False»
isa-ok 42, Numeric; # OUTPUT: «ok 1 - The object is-a 'Numeric'»
See primary docmentation in context for routine isa.
multi method isa(Mu $type --> Bool:D)
multi method isa(Str:D $type --> Bool:D)
Returns True if the invocant is an instance of class $type, a subset type or a derived class (through inheritance) of $type. does is similar, but includes roles.
my $i = 17;
say $i.isa("Int"); # OUTPUT: «True»
say $i.isa(Any); # OUTPUT: «True»
role Truish {};
my $but-true = 0 but Truish;
say $but-true.^name; # OUTPUT: «Int+{Truish}»
say $but-true.does(Truish); # OUTPUT: «True»
say $but-true.isa(Truish); # OUTPUT: «False»