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/Crystal

struct Bool

Overview

Bool has only two possible values: true and false. They are constructed using these literals:

true  # A Bool that is true
false # A Bool that is false

See Bool literals in the language reference.

Defined in:

bool.cr
json/to_json.cr
primitives.cr
uri/params/to_www_form.cr
yaml/to_yaml.cr

Constructors

Instance Method Summary

Instance methods inherited from struct Value

==(other : Log::Metadata::Value)
==(other : JSON::Any)
==(other : YAML::Any)
==(other) ==, dup dup

Instance methods inherited from class Object

! : Bool !, !=(other) !=, !~(other) !~, ==(other) ==, ===(other : JSON::Any)
===(other : YAML::Any)
===(other) ===, =~(other) =~, as(type : Class) as, as?(type : Class) as?, class class, dup dup, hash(hasher)
hash hash, in?(collection : Object) : Bool
in?(*values : Object) : Bool in?, inspect(io : IO) : Nil
inspect : String inspect, is_a?(type : Class) : Bool is_a?, itself itself, nil? : Bool nil?, not_nil!(message)
not_nil! not_nil!, pretty_inspect(width = 79, newline = "\n", indent = 0) : String pretty_inspect, pretty_print(pp : PrettyPrint) : Nil pretty_print, responds_to?(name : Symbol) : Bool responds_to?, tap(&) tap, to_json(io : IO) : Nil
to_json : String to_json, to_pretty_json(indent : String = " ") : String
to_pretty_json(io : IO, indent : String = " ") : Nil to_pretty_json, to_s(io : IO) : Nil
to_s : String to_s, to_yaml(io : IO) : Nil
to_yaml : String to_yaml, try(&) try, unsafe_as(type : T.class) forall T unsafe_as

Class methods inherited from class Object

from_json(string_or_io : String | IO, root : String)
from_json(string_or_io : String | IO) from_json, from_yaml(string_or_io : String | IO) from_yaml

Macros inherited from class Object

class_getter(*names, &block) class_getter, class_getter!(*names) class_getter!, class_getter?(*names, &block) class_getter?, class_property(*names, &block) class_property, class_property!(*names) class_property!, class_property?(*names, &block) class_property?, class_setter(*names) class_setter, def_clone def_clone, def_equals(*fields) def_equals, def_equals_and_hash(*fields) def_equals_and_hash, def_hash(*fields) def_hash, delegate(*methods, to object) delegate, forward_missing_to(delegate) forward_missing_to, getter(*names, &block) getter, getter!(*names) getter!, getter?(*names, &block) getter?, property(*names, &block) property, property!(*names) property!, property?(*names, &block) property?, setter(*names) setter

Constructor Detail

def self.new(ctx : YAML::ParseContext, node : YAML::Nodes::Node)Source

def self.new(pull : JSON::PullParser) : selfSource

Instance Method Detail

def !=(other : Bool) : BoolSource

Returns true if self is not equal to other.

def &(other : Bool) : BoolSource

Bitwise AND. Returns true if this bool and other are true, otherwise returns false.

false & false # => false
false & true  # => false
true & false  # => false
true & true   # => true

def ==(other : Bool) : BoolSource

Returns true if self is equal to other.

def ^(other : Bool) : BoolSource

Exclusive OR. Returns true if this bool is different from other, otherwise returns false.

false ^ false # => false
false ^ true  # => true
true ^ false  # => true
true ^ true   # => false

def |(other : Bool) : BoolSource

Bitwise OR. Returns true if this bool or other is true, otherwise returns false.

false | false # => false
false | true  # => true
true | false  # => true
true | true   # => true

def clone : BoolSource

def hash(hasher)Source

See Object#hash(hasher)

def to_json(json : JSON::Builder) : NilSource

def to_s(io : IO) : NilSource

Appends "true" for true and "false" for false to the given IO.

def to_s : StringSource

Returns "true" for true and "false" for false.

def to_unsafe : LibC::IntSource

Returns an integer derived from the boolean value, for interoperability with C-style booleans.

The value is 1 for true and 0 for false.

def to_yaml(yaml : YAML::Nodes::Builder) : NilSource

© 2012–2026 Manas Technology Solutions.
Licensed under the Apache License, Version 2.0.
https://crystal-lang.org/api/1.19.0/Bool.html