End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
instance method
Array#intersection
array.intersection(*other_arrays) → new_array
array.c
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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;
}
Returns a new Array containing each element found both in self and in all of the given Arrays other_arrays; duplicates are omitted; items are compared using eql?:
Example
[0, 1, 2, 3].intersection([0, 1, 2], [0, 1, 3]) # => [0, 1] [0, 0, 1, 1, 2, 3].intersection([0, 1, 2], [0, 1, 3]) # => [0, 1]
Preserves order from self:
Example
[0, 1, 2].intersection([2, 1, 0]) # => [0, 1, 2]
Returns a copy of self if no arguments given.
Related: Array#&.