The class of the singleton object nil.
static VALUE
false_and(VALUE obj, VALUE obj2)
{
return Qfalse;
} 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.
#define case_equal rb_equal
Case Equality – For class Object, effectively the same as calling #==, but typically overridden by descendants to provide meaningful semantics in case statements.
static VALUE
nil_match(VALUE obj1, VALUE obj2)
{
return Qnil;
} Dummy pattern matching – always returns nil.
#define false_xor true_and
Exclusive Or—If obj is nil or false, returns false; otherwise, returns true.
static VALUE
nil_inspect(VALUE obj)
{
return rb_usascii_str_new2("nil");
} Always returns the string “nil”.
static VALUE
rb_true(VALUE obj)
{
return Qtrue;
} Only the object nil responds true to nil?.
static VALUE
nilclass_rationalize(int argc, VALUE *argv, VALUE self)
{
rb_check_arity(argc, 0, 1);
return nilclass_to_r(self);
} Returns zero as a rational. The optional argument eps is always ignored.
static VALUE
nil_to_a(VALUE obj)
{
return rb_ary_new2(0);
} Always returns an empty array.
nil.to_a #=> []
static VALUE
nilclass_to_c(VALUE self)
{
return rb_complex_new1(INT2FIX(0));
} Returns zero as a complex.
# File ext/bigdecimal/lib/bigdecimal/util.rb, line 178 def to_d BigDecimal(0) end
Returns nil represented as a BigDecimal.
require 'bigdecimal' require 'bigdecimal/util' nil.to_d # => 0.0
static VALUE
nil_to_f(VALUE obj)
{
return DBL2NUM(0.0);
} Always returns zero.
nil.to_f #=> 0.0
static VALUE
nil_to_h(VALUE obj)
{
return rb_hash_new();
} Always returns an empty hash.
nil.to_h #=> {}
static VALUE
nil_to_i(VALUE obj)
{
return INT2FIX(0);
} Always returns zero.
nil.to_i #=> 0
static VALUE
nilclass_to_r(VALUE self)
{
return rb_rational_new1(INT2FIX(0));
} Returns zero as a rational.
static VALUE
nil_to_s(VALUE obj)
{
return rb_cNilClass_to_s;
} Always returns the empty string.
#define false_or true_and
Or—Returns false if obj is nil or false; true otherwise.
Ruby Core © 1993–2020 Yukihiro Matsumoto
Licensed under the Ruby License.
Ruby Standard Library © contributors
Licensed under their own licenses.