class NilClass
The class of the singleton object nil.
In Files
- complex.c
- object.c
- rational.c
Parent
Public Instance Methods
false & obj → false
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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
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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"
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Always returns the string “nil”.
static VALUE
nil_inspect(VALUE obj)
{
return rb_usascii_str_new2("nil");
}
nil? → true
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Only the object nil responds true to
nil?.
static VALUE
rb_true(VALUE obj)
{
return Qtrue;
}
rationalize([eps]) → (0/1)
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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 → []
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Always returns an empty array.
nil.to_a #=> []
static VALUE
nil_to_a(VALUE obj)
{
return rb_ary_new2(0);
}
to_c → (0+0i)
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Returns zero as a complex.
static VALUE
nilclass_to_c(VALUE self)
{
return rb_complex_new1(INT2FIX(0));
}
to_f → 0.0
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Always returns zero.
nil.to_f #=> 0.0
static VALUE
nil_to_f(VALUE obj)
{
return DBL2NUM(0.0);
}
to_h → {}
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Always returns an empty hash.
nil.to_h #=> {}
static VALUE
nil_to_h(VALUE obj)
{
return rb_hash_new();
}
to_i → 0
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Always returns zero.
nil.to_i #=> 0
static VALUE
nil_to_i(VALUE obj)
{
return INT2FIX(0);
}
to_r → (0/1)
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Returns zero as a rational.
static VALUE
nilclass_to_r(VALUE self)
{
return rb_rational_new1(INT2FIX(0));
}
to_s → ""
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Always returns the empty string.
static VALUE
nil_to_s(VALUE obj)
{
return rb_usascii_str_new(0, 0);
}
false | obj → true or false
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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;
}