In role Baggy§
See primary documentation in context for method Bool
method Bool(Baggy:D: --> Bool:D)
Returns True if the invocant contains at least one element.
my $breakfast = ('eggs' => 1).BagHash; say $breakfast.Bool; # OUTPUT: «True» # (since we have one element) $breakfast<eggs> = 0; # weight == 0 will lead to element removal say $breakfast.Bool; # OUTPUT: «False»
In Junction§
See primary documentation in context for method Bool
multi method Bool(Junction:D:)
Collapses the Junction and returns a single Boolean value according to the type and the values it holds. Every element is transformed to Bool.
my $n = Junction.new( "one", 1..6 ); say $n.Bool; # OUTPUT: «False»
All elements in this case are converted to True, so it's false to assert that only one of them is.
my $n = Junction.new( "one", <0 1> ); say $n.Bool; # OUTPUT: «True»
Just one of them is truish in this case, 1, so the coercion to Bool returns True.
In Regex§
See primary documentation in context for method Bool
multi method Bool(Regex:D: --> Bool:D)
Matches against the caller's $_ variable, and returns True for a match or False for no match.
In List§
See primary documentation in context for method Bool
method Bool(List:D: --> Bool:D)
Returns True if the list has at least one element, and False for the empty list.
say ().Bool; # OUTPUT: «False» say (1).Bool; # OUTPUT: «True»
In Failure§
See primary documentation in context for method Bool
multi method Bool(Failure:D: --> Bool:D)
Returns False, and marks the failure as handled.
sub f() { fail }; my $v = f; say $v.handled; # OUTPUT: «False» say $v.Bool; # OUTPUT: «False» say $v.handled; # OUTPUT: «True»
In Proc§
See primary documentation in context for method Bool
multi method Bool(Proc:D:)
Awaits for the process to finish and returns True if both exit code and signal of the process were 0, indicating a successful process termination. Returns False otherwise.
In role Rational§
See primary documentation in context for method Bool
multi method Bool(Rational:D: --> Bool:D)
Returns False if numerator is 0, otherwise returns True. This applies for <0/0> zero-denominator <Rational as well, despite ?<0/0>.Num being True.
In Mu§
See primary documentation in context for routine Bool
multi Bool(Mu --> Bool:D) multi method Bool( --> Bool:D)
Returns False on the type object, and True otherwise.
Many built-in types override this to be False for empty collections, the empty string or numerical zeros
say Mu.Bool; # OUTPUT: «False» say Mu.new.Bool; # OUTPUT: «True» say [1, 2, 3].Bool; # OUTPUT: «True» say [].Bool; # OUTPUT: «False» say %( hash => 'full' ).Bool; # OUTPUT: «True» say {}.Bool; # OUTPUT: «False» say "".Bool; # OUTPUT: «False» say 0.Bool; # OUTPUT: «False» say 1.Bool; # OUTPUT: «True» say "0".Bool; # OUTPUT: «True»
In role Setty§
See primary documentation in context for method Bool
multi method Bool(Setty:D: --> Bool:D)
Returns True if the invocant contains at least one element.
my $s1 = Set.new(1, 2, 3); say $s1.Bool; # OUTPUT: «True» my $s2 = $s1 ∩ Set.new(4, 5); # set intersection operator say $s2.Bool; # OUTPUT: «False»
In Capture§
See primary documentation in context for method Bool
method Bool(Capture:D: --> Bool:D)
Returns True if the Capture contains at least one named or one positional argument.
say \(1,2,3, apples => 2).Bool; # OUTPUT: «True» say \().Bool; # OUTPUT: «False»
In Str§
See primary documentation in context for method Bool
method Bool(Str:D: --> Bool:D)
Returns False if the string is empty, True otherwise.
In role Blob§
See primary documentation in context for method Bool
multi method Bool(Blob:D:)
Returns False if and only if the buffer is empty.
my $blob = Blob.new(); say $blob.Bool; # OUTPUT: «False» $blob = Blob.new([1, 2, 3]); say $blob.Bool; # OUTPUT: «True»
In Allomorph§
See primary documentation in context for method Bool
multi method Bool(::?CLASS:D:)
Returns False if the invocant is numerically 0, otherwise returns True. The Str value of the invocant is not considered.
Note: For the Allomorph subclass RatStr also see Rational.Bool.
In Map§
See primary documentation in context for method Bool
method Bool(Map:D: --> Bool:D)
Returns True if the invocant contains at least one key/value pair.
my $m = Map.new('a' => 2, 'b' => 17); say $m.Bool; # OUTPUT: «True»
In Match§
See primary documentation in context for method Bool
method Bool(Capture:D: --> Bool:D)
Returns True on successful and False on unsuccessful matches. Please note that any zero-width match can also be successful.
say 'abc' ~~ /^/; # OUTPUT: «｢｣» say $/.from, ' ', $/.to, ' ', ?$/; # OUTPUT: «0 0 True»
In role Numeric§
See primary documentation in context for method Bool
multi method Bool(Numeric:D:)
Returns False if the number is equivalent to zero, and True otherwise.
In Promise§
See primary documentation in context for method Bool
multi method Bool(Promise:D:)
Returns True for a kept or broken promise, and False for one in state Planned.
In StrDistance§
See primary documentation in context for method Bool
Returns True if before is different from after.