The class of the singleton object nil.

Methods
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I
N
R
T
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Instance Public methods
false & obj → false 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.

Source: show 

static VALUE
false_and(VALUE obj, VALUE obj2)
{
    return Qfalse;
}
false ^ obj → true or false nil ^ obj → true or false

Exclusive Or—If obj is nil or false, returns false; otherwise, returns true.

Source: show 

static VALUE
false_xor(VALUE obj, VALUE obj2)
{
    return RTEST(obj2)?Qtrue:Qfalse;
}
nil.inspect → "nil"

Always returns the string “nil”.

Source: show 

static VALUE
nil_inspect(VALUE obj)
{
    return rb_usascii_str_new2("nil");
}
nil?()

call_seq:

nil.nil?               -> true

Only the object nil responds true to nil?.

Source: show 

static VALUE
rb_true(VALUE obj)
{
    return Qtrue;
}
nil.rationalize([eps]) → (0/1)

Returns zero as a rational. An optional argument eps is always ignored.

Source: show 

static VALUE
nilclass_rationalize(int argc, VALUE *argv, VALUE self)
{
    rb_scan_args(argc, argv, "01", NULL);
    return nilclass_to_r(self);
}
nil.to_a → []

Always returns an empty array.

nil.to_a   #=> []

Source: show 

static VALUE
nil_to_a(VALUE obj)
{
    return rb_ary_new2(0);
}
nil.to_c → (0+0i)

Returns zero as a complex.

Source: show 

static VALUE
nilclass_to_c(VALUE self)
{
    return rb_complex_new1(INT2FIX(0));
}
nil.to_f → 0.0

Always returns zero.

nil.to_f   #=> 0.0

Source: show 

static VALUE
nil_to_f(VALUE obj)
{
    return DBL2NUM(0.0);
}
nil.to_i → 0

Always returns zero.

nil.to_i   #=> 0

Source: show 

static VALUE
nil_to_i(VALUE obj)
{
    return INT2FIX(0);
}
nil.to_r → (0/1)

Returns zero as a rational.

Source: show 

static VALUE
nilclass_to_r(VALUE self)
{
    return rb_rational_new1(INT2FIX(0));
}
nil.to_s → ""

Always returns the empty string.

Source: show 

static VALUE
nil_to_s(VALUE obj)
{
    return rb_usascii_str_new(0, 0);
}
false | obj → true or false nil | obj → true or false

Or—Returns false if obj is nil or false; true otherwise.

Source: show 

static VALUE
false_or(VALUE obj, VALUE obj2)
{
    return RTEST(obj2)?Qtrue:Qfalse;
}