instance method

Set#difference

(::_Each[A]) -> self

difference(p1)

static VALUE
set_i_difference(VALUE set, VALUE other)
{
    return set_i_subtract(rb_obj_dup(set), other);
}

Alias of #-

Returns a new set built by duplicating the set, removing every element that appears in the given enumerable object.

Example

Set[1, 3, 5] - Set[1, 5]                #=> Set[3]
Set['a', 'b', 'z'] - ['a', 'c']         #=> Set["b", "z"]

See also #- #delete_if #disjoint? #delete? also in 4.1 · 3.4 · 3.3 · 3.2 · 3.1 · 3.0