method

dup

v1_9_2_180 - Show latest stable - 1 note - Class: Object

dup() public

Produces a shallow copy of obj—the instance variables of obj are copied, but not the objects they reference. dup copies the tainted state of obj. See also the discussion under Object#clone. In general, clone and dup may have different semantics in descendant classes. While clone is used to duplicate an object, including its internal state, dup typically uses the class of the descendant object to create the new instance.

This method may have class-specific behavior. If so, that behavior will be documented under the #initialize_copy method of the class.

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VALUE
rb_obj_dup(VALUE obj)
{
    VALUE dup;

    if (rb_special_const_p(obj)) {
        rb_raise(rb_eTypeError, "can't dup %s", rb_obj_classname(obj));
    }
    dup = rb_obj_alloc(rb_obj_class(obj));
    init_copy(dup, obj);
    rb_funcall(dup, id_init_dup, 1, obj);

    return dup;
}

July 15, 2011 - (v1_8_6_287 - v1_9_2_180)

1 thank

Dup vs Clone difference

As for me main difference between .dup and .clone , that first one doesn’t not freeze result object if initial object was frozen.

dup

Related methods

Dup vs Clone difference