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array.c: added method that verifies if an Array is part of another #127

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array.c: added method that verifies if an Array is part of another #127

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21 changes: 21 additions & 0 deletions array.c
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Original file line number Diff line number Diff line change
Expand Up @@ -4685,6 +4685,26 @@ rb_ary_drop_while(VALUE ary)
return rb_ary_drop(ary, LONG2FIX(i));
}

/*
* call-seq:
* ary.part_of? other_ary -> bool
*
* Array 'A' is part of another array 'B' if
* each element from 'A' are included in 'B'
*
* [ "a", "c" ].part_of? [ "a", "b", "c" ] #=> true
* [ "a", "d" ].part_of? [ "a", "b", "c" ] #=> false
* [].part_of [] #=> true
*
*/

static VALUE
rb_ary_part_of(VALUE ary1, VALUE ary2)
{
ary2 = rb_ary_diff(ary1, ary2);
return rb_ary_empty_p(ary2);
}

/*
* Arrays are ordered, integer-indexed collections of any object.
* Array indexing starts at 0, as in C or Java. A negative index is
Expand Down Expand Up @@ -5020,6 +5040,7 @@ Init_Array(void)
rb_define_method(rb_cArray, "take_while", rb_ary_take_while, 0);
rb_define_method(rb_cArray, "drop", rb_ary_drop, 1);
rb_define_method(rb_cArray, "drop_while", rb_ary_drop_while, 0);
rb_define_method(rb_cArray, "part_of?", rb_ary_part_of, 1);

id_cmp = rb_intern("<=>");
sym_random = ID2SYM(rb_intern("random"));
Expand Down
14 changes: 14 additions & 0 deletions test/ruby/test_array.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -2184,4 +2184,18 @@ def test_rotate!
a = [1,2,3]
assert_raise(ArgumentError) { a.rotate!(1, 1) }
end

def test_part_of?
assert_equal(true, [].part_of?([]))
a = [1, 3, 4]
b = [1, 2, 3, 4, 5]
assert_equal(true, a.part_of?(b))
assert_equal(false, b.part_of?(a))
a = %w( ant bat cat dog )
b = %w( dog cat bat ant )
assert_equal(true, a.part_of?(b))
assert_equal(true, b.part_of?(a))
assert_raise(TypeError) { a.part_of? 1 }
assert_raise(ArgumentError) { a.part_of?() }
end
end