Class: NilClass

Inherits:

Object

• Object
• NilClass

show all

Defined in:

object.c

Overview

Instance Method Summary (collapse)

• - (Object) &

  And---Returns false.

• - (Object) ^

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

• - (Object) inspect

  Always returns the string "nil".

• - (Object) nil?

  call_seq:.

• - (Object) rationalize([eps])

  Returns zero as a rational.

• - (Array) to_a

  Always returns an empty array.

• - (Object) to_c

  Returns zero as a complex.

• - (0.0) to_f

  Always returns zero.

• - (0) to_i

  Always returns zero.

• - (Object) to_r

  Returns zero as a rational.

• - (Object) to_s

  Always returns the empty string.

• - (Object) |

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

# File 'object.c'

static VALUE
false_and(VALUE obj, VALUE obj2)
{
    return Qfalse;
}

# File 'object.c'

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

# File 'object.c'

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

nil.nil?               -> true

# File 'object.c'

static VALUE
rb_true(VALUE obj)
{
    return Qtrue;
}

# File 'rational.c'

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   #=> []

# File 'object.c'

/*
 * Document-method: to_a
 *
 *  call-seq:
 *     nil.to_a    -> []
 *
 *  Always returns an empty array.
 *
 *     nil.to_a   #=> []
 */

static VALUE
nil_to_a(VALUE obj)
{
    return rb_ary_new2(0);
}

# File 'complex.c'

static VALUE
nilclass_to_c(VALUE self)
{
    return rb_complex_new1(INT2FIX(0));
}

nil.to_f   #=> 0.0

# File 'object.c'

static VALUE
nil_to_f(VALUE obj)
{
    return DBL2NUM(0.0);
}

nil.to_i   #=> 0

# File 'object.c'

static VALUE
nil_to_i(VALUE obj)
{
    return INT2FIX(0);
}

# File 'rational.c'

static VALUE
nilclass_to_r(VALUE self)
{
    return rb_rational_new1(INT2FIX(0));
}

# File 'object.c'

static VALUE
nil_to_s(VALUE obj)
{
    return rb_usascii_str_new(0, 0);
}

# File 'object.c'

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