Documentation for routine Bool assembled from the following pages:
Role: Baggy §
From Baggy
(Baggy) method Bool §
Defined as:
method Bool(Baggy: --> Bool)Returns True if the invocant contains at least one element.
my = ('eggs' => 1).BagHash;say .Bool; # OUTPUT: «True» # (since we have one element) <eggs> = 0; # weight == 0 will lead to element removal say .Bool; # OUTPUT: «False»Role: Blob §
From Blob
(Blob) method Bool §
Defined as:
multi method Bool(Blob:)Returns False if and only if the buffer is empty.
my = Blob.new();say .Bool; # OUTPUT: «False» = Blob.new([1, 2, 3]);say .Bool; # OUTPUT: «True»Class: List §
From List
(List) method Bool §
Defined as:
method Bool(List: --> Bool)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»Class: Mu §
From Mu
(Mu) routine Bool §
multi sub Bool(Mu --> Bool)multi method Bool( --> Bool)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»Class: Failure §
From Failure
(Failure) method Bool §
Defined as:
multi method Bool(Failure: --> Bool)Returns False, and marks the failure as handled.
sub f() ;my = f;say .handled; # OUTPUT: «False» say .Bool; # OUTPUT: «False» say .handled; # OUTPUT: «True»Class: Numeric §
From Numeric
(Numeric) method Bool §
multi method Bool(Numeric:)Returns False if the number is equivalent to zero, and True otherwise.
Class: Map §
From Map
(Map) method Bool §
Defined as:
method Bool(Map: --> Bool)Returns True if the invocant contains at least one key/value pair.
my = Map.new('a' => 2, 'b' => 17);say .Bool; # OUTPUT: «True»Role: Setty §
From Setty
(Setty) method Bool §
Defined as:
multi method Bool(Setty: --> Bool)Returns True if the invocant contains at least one element.
my = Set.new(1, 2, 3);say .Bool; # OUTPUT: «True» my = ∩ Set.new(4, 5); # set intersection operator say .Bool; # OUTPUT: «False»Class: Promise §
From Promise
(Promise) method Bool §
multi method Bool(Promise:)Returns True for a kept or broken promise, and False for one in state Planned.
Class: Regex §
From Regex
(Regex) method Bool §
multi method Bool(Regex: --> Bool)Matches against the caller's $_ variable, and returns True for a match or False for no match.
Role: Rational §
From Rational
(Rational) method Bool §
Defined as:
multi method Bool(Rational: --> Bool)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.
Class: Allomorph §
From Allomorph
(Allomorph) method Bool §
multi method Bool(::?CLASS:)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.
Class: Str §
From Str
(Str) method Bool §
Defined as:
method Bool(Str: --> Bool)Returns False if the string is empty, True otherwise.
Class: Junction §
From Junction
(Junction) method Bool §
Defined as:
multi method Bool(Junction:)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 = Junction.new( "one", 1..6 );say .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 = Junction.new( "one", <0 1> );say .Bool; # OUTPUT: «True» Just one of them is truish in this case, 1, so the coercion to Bool returns True.
Class: Capture §
From Capture
(Capture) method Bool §
Defined as:
method Bool(Capture: --> Bool)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»Class: StrDistance §
From StrDistance
(StrDistance) method Bool §
Returns True if before is different from after.
Class: Proc §
From Proc
(Proc) method Bool §
multi method Bool(Proc:)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.
Class: Match §
From Match
(Match) method Bool §
Defined as:
method Bool(Capture: --> Bool)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»