class NilClass
The class of the singleton object nil
.
Public Instance Methods
false & obj → false
click to toggle source
nil & 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.
static VALUE false_and(VALUE obj, VALUE obj2) { return Qfalse; }
false ^ obj → true or false
click to toggle source
nil ^ obj → true or false
Exclusive Or—If obj is nil
or false
,
returns false
; otherwise, returns true
.
static VALUE false_xor(VALUE obj, VALUE obj2) { return RTEST(obj2)?Qtrue:Qfalse; }
inspect → "nil"
click to toggle source
Always returns the string “nil”.
static VALUE nil_inspect(VALUE obj) { return rb_usascii_str_new2("nil"); }
nil? → true
click to toggle source
Only the object nil responds true
to
nil?
.
static VALUE rb_true(VALUE obj) { return Qtrue; }
rationalize([eps]) → (0/1)
click to toggle source
Returns zero as a rational. The optional argument eps is always ignored.
static VALUE nilclass_rationalize(int argc, VALUE *argv, VALUE self) { rb_scan_args(argc, argv, "01", NULL); return nilclass_to_r(self); }
to_a → []
click to toggle source
Always returns an empty array.
nil.to_a #=> []
static VALUE nil_to_a(VALUE obj) { return rb_ary_new2(0); }
to_c → (0+0i)
click to toggle source
Returns zero as a complex.
static VALUE nilclass_to_c(VALUE self) { return rb_complex_new1(INT2FIX(0)); }
to_f → 0.0
click to toggle source
Always returns zero.
nil.to_f #=> 0.0
static VALUE nil_to_f(VALUE obj) { return DBL2NUM(0.0); }
to_h → {}
click to toggle source
Always returns an empty hash.
nil.to_h #=> {}
static VALUE nil_to_h(VALUE obj) { return rb_hash_new(); }
to_i → 0
click to toggle source
Always returns zero.
nil.to_i #=> 0
static VALUE nil_to_i(VALUE obj) { return INT2FIX(0); }
to_r → (0/1)
click to toggle source
Returns zero as a rational.
static VALUE nilclass_to_r(VALUE self) { return rb_rational_new1(INT2FIX(0)); }
to_s → ""
click to toggle source
Always returns the empty string.
static VALUE nil_to_s(VALUE obj) { return rb_usascii_str_new(0, 0); }
false | obj → true or false
click to toggle source
nil | obj → true or false
Or—Returns false
if obj is nil
or
false
; true
otherwise.
static VALUE false_or(VALUE obj, VALUE obj2) { return RTEST(obj2)?Qtrue:Qfalse; }