Method: Array#intersection

Defined in:

array.c

#intersection(*other_arrays) ⇒ Object

Returns a new array containing each element in self that is #eql? to at least one element in each of the given other_arrays; duplicates are omitted:

[0, 0, 1, 1, 2, 3].intersection([0, 1, 2], [0, 1, 3]) # => [0, 1]

Each element must correctly implement method #hash.

Order from self is preserved:

[0, 1, 2].intersection([2, 1, 0]) # => [0, 1, 2]

Returns a copy of self if no arguments are given.

Related: see Methods for Combining.

# File 'array.c', line 5701

static VALUE
rb_ary_intersection_multi(int argc, VALUE *argv, VALUE ary)
{
    VALUE result = rb_ary_dup(ary);
    int i;

    for (i = 0; i < argc; i++) {
        result = rb_ary_and(result, argv[i]);
    }

    return result;
}