Class: NilClass
Overview
The class of the singleton object nil
.
Instance Method Summary collapse
-
#& ⇒ Object
And---Returns
false
. -
#^ ⇒ Object
Exclusive Or---If obj is
nil
orfalse
, returnsfalse
; otherwise, returnstrue
. -
#inspect ⇒ Object
Always returns the string "nil".
-
#nil? ⇒ Object
call_seq: nil.nil? => true.
-
#to_a ⇒ Array
Always returns an empty array.
-
#to_f ⇒ 0.0
Always returns zero.
-
#to_i ⇒ 0
Always returns zero.
-
#to_s ⇒ Object
Always returns the empty string.
-
#| ⇒ Object
Or---Returns
false
if obj isnil
orfalse
;true
otherwise.
Instance Method Details
#&(obj) ⇒ false #&(obj) ⇒ false
And---Returns false
. obj is always evaluated as it is the argument to a method call---there is no short-circuit evaluation in this case.
|
# File 'object.c'
static VALUE
false_and(obj, obj2)
VALUE obj, obj2;
{
return Qfalse;
}
|
#^(obj) ⇒ Boolean #^(obj) ⇒ Boolean
Exclusive Or---If obj is nil
or false
, returns false
; otherwise, returns true
.
|
# File 'object.c'
static VALUE
false_xor(obj, obj2)
VALUE obj, obj2;
{
return RTEST(obj2)?Qtrue:Qfalse;
}
|
#inspect ⇒ Object
Always returns the string "nil".
|
# File 'object.c'
static VALUE
nil_inspect(obj)
VALUE obj;
{
return rb_str_new2("nil");
}
|
#nil? ⇒ Object
call_seq:
nil.nil? => true
Only the object nil responds true
to nil?
.
|
# File 'object.c'
static VALUE
rb_true(obj)
VALUE obj;
{
return Qtrue;
}
|
#to_a ⇒ Array
Always returns an empty array.
nil.to_a #=> []
|
# File 'object.c'
static VALUE
nil_to_a(obj)
VALUE obj;
{
return rb_ary_new2(0);
}
|
#to_f ⇒ 0.0
Always returns zero.
nil.to_f #=> 0.0
|
# File 'object.c'
static VALUE
nil_to_f(obj)
VALUE obj;
{
return rb_float_new(0.0);
}
|
#to_i ⇒ 0
Always returns zero.
nil.to_i #=> 0
|
# File 'object.c'
static VALUE
nil_to_i(obj)
VALUE obj;
{
return INT2FIX(0);
}
|
#to_s ⇒ Object
Always returns the empty string.
nil.to_s #=> ""
|
# File 'object.c'
static VALUE
nil_to_s(obj)
VALUE obj;
{
return rb_str_new2("");
}
|
#|(obj) ⇒ Boolean #|(obj) ⇒ Boolean
Or---Returns false
if obj is nil
or false
; true
otherwise.
|
# File 'object.c'
static VALUE
false_or(obj, obj2)
VALUE obj, obj2;
{
return RTEST(obj2)?Qtrue:Qfalse;
}
|